镍
材料科学
价(化学)
阴极
热稳定性
温度梯度
化学物理
不稳定性
化学工程
冶金
化学
物理化学
机械
物理
有机化学
量子力学
工程类
作者
Ruoqian Lin,Seong‐Min Bak,Young Ho Shin,Rui Zhang,Chunyang Wang,Kim Kisslinger,Mingyuan Ge,Xiaojing Huang,Zulipiya Shadike,Ajith Pattammattel,Hanfei Yan,Yong S. Chu,Jinpeng Wu,Wanli Yang,M. Stanley Whittingham,Huolin L. Xin,Xiao‐Qing Yang
标识
DOI:10.1038/s41467-021-22635-w
摘要
High-nickel content cathode materials offer high energy density. However, the structural and surface instability may cause poor capacity retention and thermal stability of them. To circumvent this problem, nickel concentration-gradient materials have been developed to enhance high-nickel content cathode materials' thermal and cycling stability. Even though promising, the fundamental mechanism of the nickel concentration gradient's stabilization effect remains elusive because it is inseparable from nickel's valence gradient effect. To isolate nickel's valence gradient effect and understand its fundamental stabilization mechanism, we design and synthesize a LiNi0.8Mn0.1Co0.1O2 material that is compositionally uniform and has a hierarchical valence gradient. The nickel valence gradient material shows superior cycling and thermal stability than the conventional one. The result suggests creating an oxidation state gradient that hides the more capacitive but less stable Ni3+ away from the secondary particle surfaces is a viable principle towards the optimization of high-nickel content cathode materials.
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