阴极
材料科学
电解质
溶解
镍
电化学
电子转移
聚偏氟乙烯
化学工程
Crystal(编程语言)
分析化学(期刊)
电极
复合材料
冶金
聚合物
化学
物理化学
有机化学
程序设计语言
工程类
计算机科学
作者
Yongkang Han,Shuai Heng,Yan Wang,Qunting Qu,Honghe Zheng
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2020-06-23
卷期号:5 (7): 2421-2433
被引量:121
标识
DOI:10.1021/acsenergylett.0c01032
摘要
Severe Ni dissolution and the resulting impedance rise for the single-crystal LiNi0.8Co0.1Mn0.1O2 cathode is the main challenge greatly hindering its industrial applications. Herein, we propose a novel concept of anchoring interfacial nickel cations on a single-crystal LiNi0.8Co0.1Mn0.1O2 cathode through controllable electron transfer. This strategy is realized by applying an ultrathin PMMA surface layer. Different from traditional physical coatings, electron transfer from Ni2+ to the ester group is confirmed, which contributes to anchoring the interfacial Ni cations and effectively inhibits Ni dissolution into the organic electrolyte. Meanwhile, Li diffusion on the cathode surface is significantly improved. As a result, the electrochemical performance of the LiNi0.8Co0.1Mn0.1O2 cathode with a PMMA layer is improved. A reversible capacity of 181.1 mAh g–1 at 1C rate is obtained with enhanced rate capability and cycling stability. Moreover, the modified LiNi0.8Co0.1Mn0.1O2 is able to work well at high voltage and high temperature, especially with incorporation of polyvinylidene fluoride.
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