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| 1 | Yolk-Shell P3-Type K_(0.5)[Mn_(0.85)Ni_(0.1)Co_(0.05)]O_(2):A Low-Cost Cathode for Potassium-Ion Batteries显示文摘Low-cost preparation methods for cathodes with high capacity and long cycle life are crucial for commercializing potassium-ion batteries(PIBs).Presently,the charging/discharging strain that develops in the active cathode material of PIBs causes cracks in the particles,leading to a sharp capacity fade.Here,to abate the strain release and the need for an industrially relevant process,a simple low-cost co-precipitation method for synthesizing yolk-shell P3-type K_(0.5)[Mn_(0.85)Ni_(0.1)Co_(0.05)]O_(2) (YS-KMNC)was reported.As cathode material for PIBs,the YS-KMNC delivers a high reversible capacity(96 mAh g^(-1) at 20 mA g^(-1))and excellent cycle stability(80.5%retention over 400 cycles at a high current density of 200 mA g^(-1)).More importantly,a full battery assembled with the YS-KMNC cathode and a commercial graphite anode exhibits a high operating voltage(0.5-3.4 V)and an excellent cycling performance(84.2%retention for 100 cycles at 100 mA g^(-1)).Considering the low-cost,simple production process and high performance of YS-KMNC cathode,this work could pave the way for the commercial development of PIBs. | Jiaxin Hao Ke Xiong Jiang Zhou Apparao M.Rao Xianyou Wang Huan Liu Bingan Lu | 2022 | Energy & Environmental Materials2022，5，1： | 2 |
| 2 | Cell-like-carbon-micro-spheres for robust potassium anode显示文摘Large-scale low-cost synthesis methods for potassium ion battery(PIB)anodes with long cycle life and high capacity have remained challenging.Here,inspired by the structure of a biological cell,biomimetic carbon cells(BCCs)were synthesized and used as PIB anodes.The protruding carbon nanotubes across the BCC wall mimicked the ion-transporting channels present in the cell membrane,and enhanced the rate performance of PIBs.In addition,the robust carbon shell of the BCC could protect its overall structure,and the open space inside the BCC could accommodate the volume changes caused by K+insertion,which greatly improved the stability of PIBs.For the first time,a stable solid electrolyte interphase layer is formed on the surface of amorphous carbon.Collectively,the unique structural characteristics of the BCCs resulted in PIBs that showed a high reversible capacity(302 m Ah g^(-1)at 100 m A g^(-1)and 248 mAh g^(-1)at500 m A g^(-1)),excellent cycle stability(reversible capacity of 226 m Ah g^(-1)after 2100 cycles and a continuous running time of more than 15 months at a current density of 100 m A g^(-1)),and an excellent rate performance(160 mAh g^(-1)at 1 A g^(-1)).This study represents a new strategy for boosting battery performance,and could pave the way for the next generation of battery-powered applications. | Hongbo Ding Jiang Zhou Apparao M.Rao Bingan Lu | 2021 | National Science Review2021，8，9： | 2 |
| 3 | Cyclic-anion salt for high-voltage stable potassium-metal batteries显示文摘Electrolyte anions are critical for achieving high-voltage stable potassium-metal batteries(PMBs).However,the common anions cannot simultaneously prevent the formation of‘dead K’and the corrosion of Al current collector,resulting in poor cycling stability.Here,we demonstrate cyclic anion of hexafluoropropane-1,3-disulfonimide-based electrolytes that can mitigate the‘dead K’and remarkably enhance the high-voltage stability of PMBs.Particularly,even using low salt concentration(0.8 M)and additive-free carbonate-based electrolytes,the PMBs with a high-voltage polyanion cathode(4.4 V)also exhibit excellent cycling stability of 200 cycles with a good capacity retention of 83%.This noticeable electrochemical performance is due to the highly efficient passivation ability of the cyclic anions on both anode and cathode surfaces.This cyclic-anion-based electrolyte design strategy is also suitable for lithium and sodium-metal battery technologies. | Yanyao Hu Ling Fan Apparao M.Rao Weijian Yu Caixiang Zhuoma Yanhong Feng Zhihui Qin Jiang Zhou Bingan Lu | 2022 | National Science Review2022，9，10： | 1 |
| 4 | Ti2CTx MXene-based all-optical modulator显示文摘MXenes,a new class of 2D transition metal carbides,nitrides,and carbonitrides,have attracted much attention due to their outstanding properties.Here,we report the broadband spatial self-phase modulation of Ti2CTx MXene nanosheets dispersed in deionized water in the visible to near-infrared regime,highlighting the broadband nonlinear optical(NLO)response of Ti2CTx MXene.Using ultrafast pulsed laser excitation,the nonlinear refractive index n2 and the thirdorder nonlinear susceptibility χ^(3)monolayer of Ti2CTx MXene were measured to be^10^−13 m^2/W and ~10^−10 esu,respectively.Leveraging the large optical nonlinearity of Ti2CTx MXene,an all-optical modulator in the visible regime was fabricated based on the spatial cross-phase modulation effect.This work suggests that 2D MXenes are ideal broadband NLO materials with excellent prospects in NLO applications. | Jun Yi Jie Li Shuohan Huang Longyu Hu Lili Miao Chujun Zhao Shuangchun Wen Vadym N.Mochalin Apparao M.Rao | 2020 | InfoMat2020，2，3： | 1 |
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