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| 1 | Enhanced high-temperature performance of Li-rich layered oxide via surface heterophase coating显示文摘Li-rich layered oxides have become one of the most concerned cathode materials for high-energy lithiumion batteries, but they still suffer from poor cycling stability and detrimental voltage decay, especially at elevated temperature. Herein, we proposed a surface heterophase coating engineering based on amorphous/crystalline Li3 PO4 to address these issues for Li-rich layered oxides via a facile wet chemical method. The heterophase coating layer combines the advantages of physical barrier effect achieved by amorphous Li3 PO4 with facilitated Li+diffusion stemmed from crystalline Li3 PO4. Consequently, the modified Li(1.2) Ni(0.2) Mn(0.6) O2 delivers higher initial coulombic efficiency of 92% with enhanced cycling stability at 55 °C(192.9 mAh/g after 100 cycles at 1 C). More importantly, the intrinsic voltage decay has been inhibited as well, i.e. the average potential drop per cycle decreases from 5.96 mV to 2.99 mV. This surface heterophase coating engineering provides an effective strategy to enhance the high-temperature electrochemical performances of Li-rich layered oxides and guides the direction of surface modification strategies for cathode materials in the future. | Yuefeng Su Feiyu Yuan Lai Chen Yun Lu Jinyang Dong Youyou Fang Shi Chen Feng Wu | 2020 | Journal of Energy Chemistry2020，29，12： | 7 |
| 2 | Modification of LiCo_(1/3)Ni_(1/3)Mn_(1/3)O_2 cathode material by CeO_2-coating显示文摘LiCo1/3Ni1/3Mn1/3O2 was coated by a layer of 1.0 wt% CeO2 via sol-gel method. The bared and coated LiMn1/3Co1/3Ni1/3O2 was characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),cyclic voltammogram (CV) and galvanotactic charge-discharge test. The results show that the coating layer has no effect on the crystal structure,only coating on the surface; the 1.0 wt% CeO2-coated LiCo1/3Ni1/3Mn1/3O2 exhibits better discharge capacity and cycling performance than the bared LiCo1/3Ni1/3Mn1/3O2. The discharge capacity of 1.0 wt% CeO2-coated cathode is 182.5 mAh.g-1 at a current density of 20 mA.g-1,in contrast to 165.8 mAh.g-1of the bared sample. The discharge capacity retention of 1.0 wt% CeO2-coated sample after 12 cycles reaches 93.2%,in comparison with 86.6% of the bared sample. CV results show that the CeO2 coating could suppress phase transitions and prevent the surface of cathode material from direct contact with the electrolyte,thus enhance the electro-chemical performance of the coated material. | WANG Meng,WU Feng,SU YueFeng & CHEN Shi Beijing Key Laboratory of Environment,School of Chemical Engineering and Environment,Beijing Institute of Technology National Development Center of High Technology Green Materials,Beijing 100081,China | 2009 | Science China(Technological Sciences)2009，52，9： | 7 |
| 3 | Advances and Prospects of Surface Modification on Nickel-Rich Materials for Lithium-Ion Batteries显示文摘Although layered Ni-rich cathode materials have attracted lots of attention for their high capacity and power density,several significant issues,such aspoor thermal stability and moderate oyclability lit their practical appications.Most of these undesired problems of Ni-rich materials are caused by theunstable surface or the parasic reactions at cathode-electrolyte interface.5urface coating is the most common method to suppress such interfacialproblems for Ni-rich materials.This review focuses on the surface engineering of the N-rich materials in recent years,including the species used in coat.ing synthetic strategies of uniform coating layer,and the positive effects of coating species on the active materials.Detailed discussions are also taken todescribe the formation mechanism of the surface coating layer with design philosophy.Finally,the prospects for further developments and challenges insurface coating are also summarized. | Yuefeng Su Gang Chen Lai Chen Qing Li Yun Lu Liying Bao Ning Li Shi Chen Feng Wu | 2020 | Chinese Journal of Chemistry2020，38，12： | 5 |
| 4 | The mechanism of side reaction induced capacity fading of Ni-rich cathode materials for lithium ion batteries显示文摘Ni-rich cathode materials show great potential of applying in high-energy lithium ion batteries,but their inferior cycling stability hinders this process.Study on the electrode/electrolyte interfacial reaction is indispensable to understand the capacity failure mechanism of Ni-rich cathode materials and further address this issue.This work demonstrates the domain size effects on interfacial side reactions firstly,and further analyzes the inherent mechanism of side reaction induced capacity decay through comparing the interfacial behaviors before and after MgO coating.It has been determined that LiF deposition caused thicker SEI films may not increase the surface film resistance,while HF erosion induced surface phase transition will increase the charge transfer resistance,and the later plays the dominant factor to declined capacity of Ni-rich cathode materials.This work suggests strategies to suppress the capacity decay of layered cathode materials and provides a guidance for the domain size control to match the various applications under different current rates. | Daozhong Hu Yuefeng Su Lai Chen Ning Li Liying Bao Yun Lu Qiyu Zhang Jing Wang Shi Chen Feng Wu | 2021 | Journal of Energy Chemistry2021，30，7： | 5 |
| 5 | Strategies of Removing Residual Lithium Compounds on the Surface of Ni-Rich Cathode Materials显示文摘Ni-rich cathode materials have become one of the most promising cathode materials for advanced high-energy Li-ion batteries(LIBs)owing to their high specific capacity.However,Ni-rich cathode materials are sensitive to the trace H2O and CO2 in the air,and tend to react with them to generate LiOH and Li2COg at the particle surface region(named residual lithium compounds,labeled as RLCs).The RLCs will deteriorate the comprehensive performances of Ni-rich cathode materials and make trouble in the subsequent manufacturing process of electrode,including causing low initial coulombic efficiency and poor storage property,bringing about potential safety hazards,and gelatinizing the electrode slurry.Therefore,it is of considerable significance to remove the RLCs.Researchers have done a lot of work on the corresponding field,such as exploring the formation mechanism and elimination methods.This paper investigates the origin of the surface residual lithium compounds on Ni-rich cathode materials,analyzes their adverse effects on the per-formance and the subsequent electrode production process,and summarizes various kinds of feasible methods for removing the RLCS.Finally,we propose a new research direction of eliminating the lithium residuals after comparing and summing up the above.We hope this work can provide a reference for alleviating the adverse effects of residual lithium compounds for Ni-rich cathode materials'industrial production. | Yuefeng Su Linwei Li Gang Chen Lai Chen Ning Li Yun Lu Liying Bao Shi Chen Feng Wu | 2021 | Chinese Journal of Chemistry2021，39，1： | 4 |
| 6 | Stress accumulation in Ni-rich layered oxide cathodes:Origin,impact,and resolution显示文摘LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x+y+z=1)is one of the most promising cathode candidates for high energy density lithium-ion batteries(LIBs).Due to the potential in enhancing energy density and cyclic life of LIBs,Ni-rich layered NCM(NCM,x≥0.6)have garnered significant research attention.However,improved specific capacity lead to severer expansion and shrinkage of layered lattice,accelerating the stress generation and accumulation even microcracks formation in NCM materials.The microcracks can promote the electrolyte permeation and decomposition,which can consequently reduce cyclic stabilities.Therefore,it is significant to provide an in-depth insight into the origin and impacts of stress accumulation,and the available modification strategies for the future development of NCM materials.In this review,we will first summarize the origin of stress accumulation in NCM materials.Next,we discuss the impact of stress accumulation.The electrolyte permeation along microcracks can enhance the extent of side reaction at the interface,trigger phase transformation and consequential capacity fading.To cushion the impact of stress accumulation,we will review five main strategies.Finally,concise perspectives to reduce stress accumulation and enhance particle strength in further works will be presented. | Yuefeng Su Qiyu Zhang Lai Chen Liying Bao Yun Lu Shi Chen Feng Wu | 2022 | Journal of Energy Chemistry2022，31，2： | 4 |
| 7 | Application prospects of high-voltage cathode materials in all-solid-state lithium-ion batteries显示文摘All-solid-state lithium-ion batteries are lithiumion batteries with solid-state electrolytes instead of liquid electrolytes.They are hopeful in solving the safety problems of lithium-ion batteries,once their large capacity and long life are achieved,they will have broad application prospects in the field of electric vehicles and large-scale energy storage.The working potential window of solid electrolytes is wider than that of liquid electrolytes,so high-voltage cathode materials could be used in all-solidstate lithium-ion batteries to get higher energy density and larger capacity by elevating the working voltage of the batteries.The spinel LiNi0.5Mn1.5O4material,layered Li–Ni–Co–Mn–O cathode materials and lithium-rich cathode materials can be expected to be applied to all-solid-state lithium-ion batteries as cathode materials due to their highvoltage platforms.In this review,the electrochemical properties and structures of spinel LiNi0.5Mn1.5O4material,layered Li–Ni–Co–Mn–O cathode materials and lithiumrich cathode materials are introduced.More attentions are paid on recent research progress of conductivity and interface stability of these materials,in order to improve their compatibility with solid electrolytes as cathode materials in all-solid-state lithium-ion batteries and fully improve the properties of all-solid-state batteries.Finally,the existing problems of their application in all-solid-state lithium-ion batteries are summarized,the main research directions are put forward and their application prospects in all-solid-state lithium-ion batteries are discussed. | Jun Tian Yi Jin Yibiao Guan Yuefeng Su Liying Bao Shi Chen Feng Wu | 2014 | Chinese Science Bulletin2014，59，17： | 4 |
| 8 | Unrevealing the effects of low temperature on cycling life of 21700-type cylindrical Li-ion batteries显示文摘The low-temperature performance of Li-ion batteries(LIBs) has important impacts on their commercial applications. Besides the metallic lithium deposition, which is regarded as one of the main failure mechanisms of the LIBs at low temperatures, the synergistic effects originating from the cathode, anode, electrolyte, and separators to the batteries are still not clear. Here, the 21700-type cylindrical batteries were evaluated at a wide range of temperatures to investigate the failure mechanism of batteries. Voltage relaxation, and the post-mortem analysis combined with the electrochemical tests, unravel that the capacity degradation of batteries at low temperature is related to the lithium plating at graphite anodes,the formation of unsatisfied solid deposited/decomposed electrolyte mixture phase on the anode, the precipitation of solvent in the electrolytes and the block of separator pores, and the uneven dissolved transition metal-ions from the cathode. We hope this finding may open up a new avenue to alleviate the capacity degradation of advanced LIBs at low temperatures and shed light on the development of outstanding low-temperature LIBs via simultaneous optimization of all the components including electrodes, electrolytes and separators. | Daozhong Hu Gang Chen Jun Tian Ning Li Lai Chen Yuefeng Su Tinglu Song Yun Lu Duanyun Cao Shi Chen Feng Wu | 2021 | Journal of Energy Chemistry2021，30，9： | 3 |
| 9 | Methods for promoting electrochemical properties of LiNi_(l/3) Co_(l/3) Mn_(l/3)O_2 for lithium-ion batteries显示文摘One popular study of the recent research is to develop the cathode materials for lithium-ion batteries. As a new cathode material for lithium-ion batteries, the LiNil/3Col/3Mnl/3O2 has drawn widespread attention because of its high capacity, high cut-off voltage and high tap density. Its theoretical capacity is 277.8 mAh/g. The crystal structure of LiNil/3Col/3Mnl/3O2 is α-NaFeO 2 . The structural and morphological features of the LiNil/3Col/3Mnl/3O2 are introduced in this paper. The emphasis is to present the methods for promoting electrochemical properties. The electrochemical properties and structure characteristics are discussed. And the prospect of layered LiNil/3Col/3Mnl/3O2 is forecast in the end. | BAO LiYing CHE HuiQuan HU DaoZhong SU YueFeng WANG Zhao LI Ning CHEN Shi WU Feng | 2013 | Chinese Science Bulletin2013，58，16： | 2 |
| 10 | The nature of irreversible phase transformation propagation in nickel-rich layered cathode for lithium-ion batteries显示文摘Ni-rich layered cathode is regarded as one of the most promising candidates to achieve lithium-ion batteries (LIBs) with high energy density. However, due to the irreversible phase transformation (IPT) and its eventual propagation from surface to the bulk of the material, Ni-rich layered cathode typically suffers from severe capacity fading, structure failure, and thermal instability, which greatly hinders its mass adoption. Hence, achieving an in-depth understanding of the IPT propagation mechanism in Ni-rich layered cathode is crucial in addressing these issues. Herein, the triggering factor of IPT propagation in Ni-rich cathode is verified to be the initial surface disordered cation mixing domain covered by a thin rock-salt phase, instead of the rock-salt phase itself. According to the density functional theory (DFT) results, it is further illustrated that the metastable cation mixing domain possesses a lower Ni migration energy barrier, which facilitates the migration of Ni ions towards the Li slab, and thus driving the propagation of IPT from surface to the bulk of the material. This finding clarifies a prevailing debate regarding the surface impurity phases of Ni-rich cathode material and reveals the origin of IPT propagation, which implies the principle and its effectiveness of tuning the surface microstructure to address the structural and thermal instability issue of Ni-rich layered cathode materials. | Feng Wu Na Liu Lai Chen Ning Li Jinyang Dong Yun Lu Guoqiang Tan Mingzhe Xu Duanyun Cao Yafei Liu Yanbin Chen Yuefeng Su | 2021 | Journal of Energy Chemistry2021，30，11： | 2 |
| 11 | Ultrathin 3 V Spinel Clothed Layered Lithium-Rich Oxides as Heterostructured Cathode for High-Energy and High-Power Li-ion Batteries显示文摘In an attempt to overcome the drawbacks of high-capacity layered lithium-rich cathodes xLi2MnO3·(1–x)LiMO2(0 | Liqin Dai Ning Li Lai Chen Yuefeng Su Cheng-Meng Chen Fangyuan Su Liying Bao Shi Chen Feng Wu | 2021 | Chinese Journal of Chemistry2021，39，2： | 1 |
| 12 | Spinel/Layered Heterostructured Cathode Material for High‐Capacity and High‐Rate Li‐Ion Batteries显示文摘 | Feng Wu Ning Li Yuefeng Su Haofang Shou Liying Bao Wen Yang Linjing Zhang Ran An Shi Chen | 2013 | Adv Mater2013，，27： | 1 |
| 13 | Interfacial Degradation and Optimization of Li-rich Cathode Materials显示文摘High-energy and safe lithium ion batteries(LIBs)are in increasing need as the rapid development of electronic devices,electric vehicles,as well as energy storage station.Li-rich oxides have attracted a lot of attention due to their high capacity and low cost as cathode material for LIBs.However,they still suffer from the vulnerable cathode/electrolyte interface,which presents the huge challenges of surface degradation and gas release,particularly at high state of charge.Some issues of Li-rich cathode materials,such as moderate cycle stability and voltage decay,are in tight connection with electrode-electrolyte interfacial side reactions.Research in the area of interfacial degradation mechanism and optimization strategies is of great significance as for Li-rich cathode,and extensive efforts have been poured.This review aims to understand the degradation mechanism of Li-rich cathode materials,and summarize the corresponding valuable and effective optimization strategies.Based on these considerations,we also have discussed the remaining challenges and the future research direction. | Yuefeng Su Jiayu Zhao Lai Chen Ning Li Yun Lu Jinyang Dong Youyou Fang Shi Chen Feng Wu | 2021 | Chinese Journal of Chemistry2021，39，2： | 1 |
| 14 | Research Progress of Lithium Plating on Graphite Anode in Lithium-Ion Batteries显示文摘Lithium plating on graphite anode is triggered by harsh conditions of fast charge and low temperature,which sig-nificantly accelerates SOH(state of health)degradation and may cause safety issues of lithium ion batteries(LIBs).This paper has reviewed recent research progress of lithium plating on graphite anode.Firstly,we summarize the forming mechanisms of Li plating with(corresponding influence factors,the detect-ing methods and hazard of Li plating.Then,approaches to suppress Li plating are discussed,including anode surface modification,electrolyte composition optimization and development of optimal charge.strategies.Finally,we con-clude and propose the remaining challenges and prospects in terms of mechanism research,detecting approaches,and suppressing methods of Li plating.This review highlights the development of Li plating research and plays a guiding rule of further study on Li plating in LIBs. | Daozhong Hu Lai Chen Jun Tian Yuefeng Su Ning Li Gang Chen Yulu Hu Yueshan Dou Shi Chen Feng Wu | 2021 | Chinese Journal of Chemistry2021，39，1： | 1 |
| 15 | Competitive effect of KOH activation on the electrochemical performances of carbon nanotubes for EDLC: Balance between porosity and conductivity显示文摘 | Bin Xu Feng Wu Yuefeng Su Gaoping Cao Shi Chen Zhiming Zhou Yusheng Yang | 2008 | Electrochimica Acta2008，，26： | 1 |
| 16 | Urea-assisted mixed gas treatment on Li-Rich layered oxide with enhanced electrochemical performance显示文摘Lithium-rich manganese-based oxides(LRMOs)have been considered as one of the most promising cathode materials owing to their superior specific capacity and high operating voltage.However,their largescale commercial applications are limited due to problems such as structural instability,voltage decay,and poor cycle stability.Herein,pre-generated oxygen vacancies and oxygen-deficient phase were introduced to Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)(LMNO)using a facile urea-assisted mixed gas treatment(UMGT)method for facilitating electronic and ionic conductivity,reducing the surface oxygen partial pressure,and suppressing the release of lattice oxygen.Compared with the pristine LMNO material,the UMGT sample modified at 200℃exhibited enhanced discharge capacity,capacity retention,and rate capability.In addition,the Li+diffusion coefficient significantly improved by 50%than that of the reference LMNO.More importantly,the voltage decay was effectively suppressed,with average potential decreasing from 0.53 V(LMNO)to 0.39 V(UMGT-200)after 200 cycles at 1 C.The proposed UMGT method provides an effective strategy to alleviate the phase transition and improve the electrochemical performance for lithium-rich materials,and identifies a promising research direction to inhibit the voltage decay of layered anion redox cathode materials. | Liying Bao Lei Wei Nuoting Fu Jinyang Dong Lai Chen Yuefeng Su Ning Li Yun Lu Yongjian Li Shi Chen Feng Wu | 2022 | Journal of Energy Chemistry2022，31，3： | 1 |
| 17 | Progression of the silicate cathode materials used in lithium ion batteries显示文摘Poly anionic silicate materials,which demonstrate a high theoretical capacity,high security,environmental friendliness and low-cost,are considered one of the most promising candidates for use as cathode materials in the next generation of lithium-ion batteries.This paper summarizes the structure and performance characteristics of these materials.The effects of different synthesis methods and calcination temperature on the properties of these materials are reviewed.Materials that demonstrate low conductivity,poor stability,cationic disorder or other drawbacks,and the use of various modification techniques,such as carbon-coating or compositing,elemental doping and combination with mesoporous materials,are evaluated as well.In addition,further research topics and the possibility of using these kinds of cathode materials in lithium-ion batteries are discussed. | BAO LiYing GAO Wei SU YueFeng WANG Zhao LI Ning CHEN Shi WU Feng | 2013 | Chinese Science Bulletin2013，58，6： | 1 |
| 18 | Can surface modification be more effective to enhance the electro chemical performance of lithium rich materials 显示文摘 | Wu Feng Li Ning Su Yuefeng | 2012 | Journal of Materials Chemistry2012，22，： | 1 |
| 19 | A novel method for synthesis of layered LiNi1/3 Co1/3 Mn1/3 02 as cathode material for lithium-ion battery 显示文摘 | Wu Feng Wang Meng Su Yuefeng | 2010 | Journal of Power Sources2010，195，： | 1 |
| 20 | Solubilization behaviors of interfacial lutetium-extractant complex in a solvent extraction system显示文摘Knowledge of the solubilization behaviors of rare-earth-extractant complex is mandatory for full comprehension of interfacial phenomenon and intermediate state of rare earth(RE) ion transport from water to oil during solvent extraction. The lutetium with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester(P507) extraction system was explored as a case study for the solubilization behaviors in this paper. With a quantitative analysis of a white crud obtained in the practical process, the results demonstrate that the insoluble REL_3(L = the anion of P507) complex enriches at the oil/water interface and forms the network polymers. Besides, with the increase of RE loading ratios in the oil phase, the interfacial tension increases while the free ligand in the bulk phase decreases, which results in the flocculation of REL_3 complex and the formation of polymers at the interface. Furthermore,the properties of the oil phase and the interface reveal that the free ligand can solubilize the REL_3 complex along with the transfer of water from microemulsion to aqueous phase. In addition, the change of aqueous acidity can regulate the solubilization behaviors of the interfacial complex to improve RE extraction efficiency. These fundamental studies will hopefully provide new insights into the solubilization of metal-extractant complex and a technical guidance to the transfer of RE from water to oil. | Wenrou Su Ji Chen Yu Jing Chuanying Liu Yuefeng Deng Maohua Yang | 2018 | Journal of Rare Earths2018，36，5： | 1 |
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