材料科学
混合(物理)
纳米-
相(物质)
阴极
化学工程
电极
氧化物
分析化学(期刊)
复合材料
冶金
化学
色谱法
物理化学
量子力学
物理
工程类
有机化学
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2016-01-01
卷期号:163 (13): A2665-A2672
被引量:96
摘要
The layered Ni-rich oxide cathode (LiNi0.8Co0.1Mn0.1O2) has been significantly attractive due to its large reversible capacity (200 mAh g−1). However, the layered Ni-rich oxide cathode suffers from a tremendous structural degradation during long-term cycling, causing the drastic rise of electrode impedance and deterioration of the capacity retention. In this paper, we develop a novel and facile approach to stabilize its structure by per-cycling of the layered Ni-rich oxide cathode at high voltage of 4.5 V (vs Li/Li+). The nano-thickness cation-mixing layers with Fm-3m structure were in-situ formed on the layered Ni-rich oxide LiNi0.8Co0.1Mn0.1O2 cathode by the surface structural transition from rhombohedral phase to cubic phase. The as-prepared LiNi0.8Co0.1Mn0.1O2 cathode coated with the nano-thickness cation-mixing layers shows superior cycling life at a cutoff voltage of 4.3 V, and it keeps a capacity retention of 83% after 500 cycles, which could be attributed to that the nano-thickness cation-mixing layers stabilize the structure of LiNi0.8Co0.1Mn0.1O2 during long-term cycling.
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