Facilitating Lithium-Ion Diffusion in Layered Cathode Materials by Introducing Li^(+)/Ni^(2+) Antisite Defects for High-Rate Li-Ion Batteries

查看全文 作　　者：Zhongfeng [1]Tang;Sen [2]Wang;Jiaying [1]Liao;Shuo [1]Wang;Xiaodong [1]He;Bicai [2]Pan;Haiyan [2]He;Chunhua [1]Chen

机构地区：[1]CAS Key Laboratory of Materials for Energy Conversions,Department of Materials Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology,University of Science and Technology of China,Anhui Hefei 230026,China;[2]School of Physical Sciences,University of Science and Technology of China,Anhui Hefei 230026,China

出　　处：《Research》索引2019年第1期,共10页

基　　金：This work was supported by the National Key R&D Program of China(grant no.2018YFB0905400);the National Science Foundation of China(NSAF U1630106,grant no.51577175);We are also grateful to Elementec Ltd.in Suzhou for its technical support. 摘　　要：Li^(+)/Ni^(2+) antisite defects mainly resulting from their similar ionic radii in the layered nickel-rich cathode materials belong to one of cation disordering scenarios.They are commonly considered harmful to the electrochemical properties,so a minimum degree of cation disordering is usually desired.However,this study indicates that LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)as the key material for Tesla batteries possesses the highest rate capability when there is a minor degree(2.3%)of Li^(+)/Ni^(2+) antisite defects existing in its layered structure.By combining a theoretical calculation,the improvement mechanism is attributed to two effects to decrease the activation barrier for lithium migration:(1)the anchoring of a low fraction of high-valence Ni^(2+) ions in the Li slab pushes uphill the nearest Li^(+)ions and(2)the same fraction of low-valence Li^(+) ions in the Ni slab weakens the repulsive interaction to the Li^(+) ions at the saddle point. 关键词：DIFFUSION CATHODE NICKEL

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Facilitating Lithium-Ion Diffusion in Layered Cathode Materials by Introducing Li^(+)/Ni^(2+) Antisite Defects for High-Rate Li-Ion Batteries

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