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| 1 | Recent progress on the modification of high nickel contentNCM:Coating,doping,and single crystallization显示文摘High nickel content layered cathodes,represented by NCM(LiNi_(x)Co_(y)Mn_(z)O_(2),x+y+z=1),are now widely employed in the market of electric vehicles,owing to their high energy density.With the gradual increase of nickel content and capacity,the issues on cycling life and safety become more serious.In this review,various strategies for improving the performance of high nickel NCM are summarized on the aspects of surface coating,ionic doping,and singlecrystal NCM.The coating strategy was separately described according to the physical property of coating species,including inert material coating,Li^(+)-conductor coating,electronic conductor coating,and mixed conductor coating.These coating species help to suppress the interfacial oxidation of electrolytes by NCM,improving the cycling life and safety.The elemental doping in the crystal lattice of NCM is then presented in the aspects of cation,anion,and mixed-ion doping,which are beneficial to stabilize the layered structure during charge–discharge and so promote the electrochemical performance.In quite recent years,the strategy of single-crystal NCM was demonstrated to be a promising pathway,owing to the dramatically reduced surface area and grain boundary.Finally,the remaining unsolved challenges and future strategies for further development of NCM cathode materials are outlined. | Junqing Yan Hao Huang Junfan Tong Wei Li Xiaohang Liu Haoxuan Zhang Heqin Huang Weidong Zhou | 2022 | Interdisciplinary Materials2022，1，3： | 2 |
| 2 | Unveiling the impact of residual Li conversion and cation ordering on electrochemical performance of Co-free Ni-rich cathodes显示文摘The residual Li and Li^(+)/Ni_(2)+cation mixing play essential roles in the electrochemical properties of Ni-rich cathodes.However,a general relationship between the residual Li conversion,cation mixing,and their effects on the Li^(+)kinetics and structural stability has yet to be established,due to the presence of cobalt in the cathode.Here,we explore the synergistic impact of the residual Li conversion and cation ordering on a Co-free Ni-rich cathode(i.e.,LiNi0.95Mn0.05O_(2)).It discloses that the rate capability is mainly affected by residual Li contents and operating voltage.Specifically,residual Li can be electrochemically converted to cathode electrolyte interphase(CEI)below 4.3 V,thus inducing high interphase resistance,and decomposes to produce CO_(2)-dominated gas at 4.5 V,causing temporary enhancement of Li^(+)diffusivity but severe surface degradation during cycling.Moreover,the cycling performance of Co-free Ni-rich cathode is not only determined by Li^(+)/Ni_(2)+cation-ordered superlattice,which enhances the structural stability as it functions as the pillar to impede lattice collapse at a highly charged state,but also by the robust CEI layers which protect the bulk from electrolyte attack under 4.3 V.These findings promote an in-depth understanding of residual Li conversion and Li^(+)/Ni_(2)+cation ordering on Co-free Ni-rich cathode. | Chu Wang Lei Tan Hongling Yi Zixiang Zhao Xiaoli Yi Youyuan Zhou Junchao Zheng Jiexi Wang Lingjun Li | 2022 | Nano Research2022，15，10： | 1 |
| 3 | Sr阳离子和O阴离子空位缺陷调控工程提升钙钛矿Sr_(x)VO_(3-δ)储锂性能显示文摘钙钛矿结构氧化物的空位缺陷调控工程在催化和太阳能电池等领域被广泛研究应用,本文进一步拓展了钙钛矿材料空位缺陷工程在储能领域的应用.使用钙钛矿Sr_(x)VO_(3-δ)材料为研究材料,通过调控溶胶燃烧过程中Sr/V化学计量比和还原温度,精确控制样品中的Sr阳离子和O阴离子的空位浓度,并且保持了Sr_(x)VO_(3-δ)材料的钙钛矿结构.电化学研究结果表明,通过提高Sr阳离子和O阴离子空位缺陷浓度,Sr_(x)VO_(3-δ)电极比容量和倍率性能显著提升.其中,Sr空位缺陷的引入为锂离子提供了额外储锂位点和扩散通道,而O空位缺陷的引入则显著提升了Sr_(x)VO_(3-δ)电极的电导率和锂离子扩散系数.因此,空位缺陷工程为钙钛矿结构储能材料电化学性能的提升和设计提供了新思路. | 李小磊 林紫锋 金娜 杨晓娇 孙雷 王园 谢雷 陈喜平 雷力 Patrick Rozier Patrice Simon 刘颖 | 2022 | Science Bulletin2022，67，22： | 0 |
| 4 | Surface-targeted functionalization of nickel-rich cathodes through synergistic slurry additive approach with multi-level impact using minimal quantity显示文摘LiNi0.8Co0.1Mn0.1O_(2)(NCM811),a Ni-rich layered oxide,is a promising cathode material for high-energy density lithium-ion batteries(LIBs).However,its structural instability,caused by adverse phase transitions and continuous oxygen release,as well as deteriorated interfacial stability due to excessive electrolyte oxidative decomposition,limits its widespread application.To address these issues,a new concept is proposed that surface targeted precise functionalization(STPF)of the NCM811 cathode using a synergistic slurry additive(SSA)approach.This approach involves coating the NCM811 particle surface with 3-aminopropyl dimethoxy methyl silane(3-ADMS),followed by the precise deposition of ascorbic acid via an acid-base interaction.The slurry additives induce the formation of an ultra-thin spinel surface layer and a stable cathode–electrolyte interface(CEI),which enhances the electrochemical kinetics and inhibits crack propagation.The STPF strategy implemented by the SSA approach significantly improves the cyclic stability and rate performance of the NCM811 cathode in both half-cell and full-cell configurations.This work establishes a promising strategy to enhance the structural stability and electrochemical performance of nickel-rich cathodes and provides a feasible route to promote practical applications of high-energy density lithium-ion battery technology. | Jing Zhang Jiapei Li Longhao Cao Wenhua Cheng Ziyin Guo Xiuxia Zuo Chao Wang Ya-Jun Cheng Yonggao Xia Yudai Huang | 2024 | Nano Research2024，17，1： | 0 |
| 5 | 高镍正极材料表面锂残渣的研究进展显示文摘目前锂离子电池的电化学性能和成本在很大程度上取决于正极材料,其中,具有高比容量和高工作电压等优点的高镍层状正极材料被广泛关注。然而,其表面的锂残渣会严重影响电极的制备和电池的电化学性能,限制了其在新能源汽车等领域的大规模应用。因此,高镍层状正极材料表面锂残渣的研究在进一步提升材料性能和电池安全性能等方面具有重要意义。本文综述了近年来高镍层状正极材料表面锂残渣的研究进展,从锂残渣形成机理,对高镍层状正极材料的影响以及酸碱滴定、傅里叶红外光谱、飞行时间二次离子质谱、固态核磁共振及热重分析结合质谱等锂残渣含量检测方法方面展开,总结了利用去除、物理包覆及原位再利用三种方法有效消除锂残渣对高镍层状正极材料的影响,改善其性能,并对进一步消除锂残渣对正极材料及锂离子电池的影响进行了展望。同时,本文针对锂残渣的展望及研究也同样适用于钠离子电池正极材料表面的钠残渣。本文旨在突出锂残渣原位再利用在高镍层状正极材料改性研究中的应用潜力,为锂离子电池的研究发展提供新的思路。 | 王盼晴 黄彦杰 何一芃 陈祁恒 尹提 陈伟豪 谭磊 宁天翔 邹康宇 李灵均 | 2024 | 储能科学与技术2024，13，1： | 0 |
| 6 | A Li_(3)Bi/LiF interfacial layer enabling highly stable lithium metal anode显示文摘Lithium metal anode is considered the alternative to graphite anode due to its ultra-high theoretical capacity of 3860 mAh·g^(-1).However,serious Li dendrite growth and drastic electrolyte side reactions restrain the commercial application of Li metal anode.In this work,a Li_(3)Bi/LiF interfacial layer is constructed on the surface of the Li metal anode by a spontaneous substitution reaction.The composite interfacial layer possesses excellent ionic conductivity,high mechanical strength,and great electrolyte wettability,which ensures fast Li-ion transfer and uniform Li deposition of the Li_(3)Bi/LiF@Li anode.Impressively,the Li_3Bi/LiF@Li symmetric cell provides a cycle life of more than 400 h with only 73 mV voltage polarization at 10 mA·cm^(-2).By pairing with commercial NCM622 cathode,the Li_(3)Bi/LiF@Li full cell exhibits a long cycle at a rate of 2 C. | Lei Tan Peng Chen Qiao-Yun Chen Xing Huang Kang-Yu Zou Yan-Mei Nie Ling-Jun Li | 2023 | Rare Metals2023，42，12： | 0 |
| 7 | Collaboratively enhancing electrochemical properties of LiNi_(0.83)Co_(0.11)Mn_(0.06)O_(2) through doping and coating of quadrivalent elements显示文摘Ni-rich layered oxides(Ni>80%)with high energy density have become a mainstream cathode material for Li-ion batteries.However,irreversible phase transitions and interface instability are deep-seated challenges in commercializing Ni-rich materials.This study used a collaborative modification strategy involving doping and coating with quadrivalent elements to construct Ni-rich materials.In particular,introducing tetravalent Zr makes the valence change of Ni(2+to 4+)more accessible to complete spontaneously during the charging and discharging processes,which significantly suppresses the cationic mixing and irreversible phase transition(H2?H3).Combining the strategy of constructing CeO_(2) coatings on the surface and interfacial spinel-like phases improves the Li+diffusion kinetics and interfacial stability.Simultaneously,part of the strongly oxidizing four-valence Ce^(4+)diffuses to the surface layer,further increasing the average valence state of Ni.Therefore,LiNi_(0.83)Co_(0.11)Mn_(0.06)O_(2)(NCM)-Zr@Ce achieves 78.5%outstanding retention at1.0C after 200 cycles within 3.0-4.3 V compared to unmodified NCM with 41.4%retention.The improved cyclic stability can be attributed to the collaborative modification strategy of the quadrivalent elements,which provides an effective synergistic modification strategy for developing high-performance Li-ion battery cathode materials. | Zhao-Zhe Yu Gui-Quan Zhao Fang-Li Ji Hao Tong Qi-Lin Tong Hua-Cheng Li Yan Cheng | 2023 | Rare Metals2023，42，12： | 0 |
| 8 | 氧化铟改性对LiNi_(0.95)Co_(0.025)Mn_(0.025)O_(2)正极材料电化学性能影响显示文摘超高镍三元正极材料LiNi_(0.95)Co_(0.025)Mn_(0.025)O_(2)(NCM)放电比容量高,环境友好,但容量衰减快和倍率性能差两大问题制约着它的应用。通过高温二次煅烧方法,研究In_(2)O_(3)对材料的改性作用,提升材料电化学性能。结果表明,In_(2)O_(3)可以通过体相和界面双重协同效应提升材料的电化学性能。在界面可以降低材料表面残碱含量,抑制电极与电解液之间的副反应,同时降低材料表面Ni^(2+)含量,降低材料锂镍混排度,提高材料有序性。在体相上,降低循环过程中H_(2)-H_(3)不可逆相转变,减少容量损失。当In_(2)O_(3)质量分数为0.5%时,材料的电化学性能表现最优,其中材料在1 C条件下循环百次后容量保持率从65.1%提升至81.5%,10 C条件下放电比容量从106.3 mAh/g提升至146.9 mAh/g。该研究结果对超高镍正极材料的改性具有重要意义。 | 侯诗艺 张同宝 杨座国 | 2023 | 电源技术2023，47，12： | 0 |
| 9 | 煅烧温度对高镍无钴LiNi_(0.90)Mn_(0.10)O_(2)正极材料结构与电化学性能的影响显示文摘采用固相法在不同的煅烧温度下(725~825℃)合成了高镍无钴LiNi_(0.90)Mn_(0.10)O_(2)正极材料,并通过结构表征和电化学测试考察了煅烧温度对正极材料的结构和电化学性能的影响。结果表明,煅烧温度会改变材料的晶胞参数,在最佳煅烧温度775℃时所制得的正极材料Li^(+)/Ni^(2+)混排程度最低;该煅烧温度制备的样品首次放电比容量最高,同时倍率性能也表现最佳,并且在循环200圈后仍然保持着最高的放电比容量。 | 谢尚辰 邹康宇 谭磊 周友元 朱健 李灵均 | 2023 | 现代化工2023，43，9： | 0 |
| 10 | LiF表面修饰协同F掺杂提升LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)正极材料电化学性能显示文摘富镍层状氧化物因高比容量和良好的倍率性能被认为是最有潜力的下一代高比能锂离子电池(LIBs)正极材料之一,但界面不稳定性和结构退化等因素导致的容量快速衰减阻碍了该类材料的商业化进程。利用LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM)的表面残锂构建了均匀的LiF涂层,并通过低温煅烧使部分F-掺杂到体相,同时优化NCM晶体表层和内部的结构稳定性。优化后的复合材料(F-NCM)在4.5 V截止电压下,以1 C电流密度循环400次后的比容量为130.8 mAh/g,保持率达到68.8%。通过与未改性的样品对比,该优化策略对放电容量和循环性能显示出明显的提升效果。此外,F-NCM也表现出良好的倍率性能,在高倍率10 C下,可以释放出161.9 mAh/g的比容量。 | 张晓辉 杨广场 陆绍荣 梁力勃 杨小飞 | 2023 | 电源技术2023，47，10： | 0 |
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