材料科学
阴极
锂(药物)
电解质
涂层
电化学
表面改性
兴奋剂
磷酸钒锂电池
无机化学
化学工程
复合材料
电极
化学
光电子学
内分泌学
工程类
物理化学
医学
作者
Xin Zhang,Tom Wu,Jiyuan Jian,Shuanglong Lin,Dandan Sun,Gang Fu,Yan Xu,Wei Wang,Sai Li,Pengjian Zuo,Yulin Ma,Geping Yin,Pengjian Zuo,Xinqun Cheng,Chunyu Du
出处
期刊:Small
[Wiley]
日期:2024-07-29
被引量:1
标识
DOI:10.1002/smll.202404488
摘要
Abstract A great challenge in the commercialization process of layered Ni‐rich cathode material LiNi x Co y Mn 1‐x‐y O 2 (NCM, x ≥ 80%) for lithium‐ion batteries is the surface instability, which is exacerbated by the increase in nickel content. The high surface alkalinity and unavoidable cathode/electrolyte interface side reactions result in significant decrease for the capacity of NCM material. Surface coating and doping are common and effective ways to improve the electrochemical performance of Ni‐rich cathode material. In this study, an in situ reaction is induced on the surface of secondary particles of NCM material to construct a stable lithium sulfate coating, while achieving sulfur doping in the near surface region. The synergistic modification of lithium sulfate coating and lattice sulfur doping significantly reduced the content of harmful residual lithium compounds (RLCs) on the surface of NCM material, suppressed the side reactions between the cathode material surface and electrolyte and the degradation of surface structure of the NCM material, effectively improved the rate capability and cycling stability of the NCM material.
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