Facilitating Lithium-Ion Diffusion in Layered Cathode Materials by Introducing Li/Ni Antisite Defects for High-Rate Li-Ion Batteries.

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ID: 82732
2019
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Abstract
Li/Ni 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 LiNiCoAlO as the key material for Tesla batteries possesses the highest rate capability when there is a minor degree (2.3%) of Li/Ni 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 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.
Reference Key
tang2019facilitatingresearch Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Tang, Zhongfeng;Wang, Sen;Liao, Jiaying;Wang, Shuo;He, Xiaodong;Pan, Bicai;He, Haiyan;Chen, Chunhua;
Journal research (washington, dc)
Year 2019
DOI
10.34133/2019/2198906
URL
Keywords
flexible electronics cathodes lithium-ion batteries hollow multishelled structures metallic textiles

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