阴极
材料科学
离子
氧化物
电池(电)
结构稳定性
泄流深度
化学工程
工程物理
复合材料
冶金
电气工程
结构工程
化学
热力学
物理
工程类
功率(物理)
有机化学
作者
Un‐Hyuck Kim,Geon Tae Park,Byoung Ki Son,Gyeong Won Nam,Jun Li,Liang Yin Kuo,Payam Kaghazchi,Chong Seung Yoon,Yang‐Kook Sun
出处
期刊:Nature Energy
[Springer Nature]
日期:2020-09-21
卷期号:5 (11): 860-869
被引量:286
标识
DOI:10.1038/s41560-020-00693-6
摘要
The demand for energy sources with high energy densities continues to push the limits of Ni-rich layered oxides, which are currently the most promising cathode materials in automobile batteries. Although most current research is focused on extending battery life using Ni-rich layered cathodes, long-term cycling stability using a full cell is yet to be demonstrated. Here, we introduce Li[Ni0.90Co0.09Ta0.01]O2, which exhibits 90% capacity retention after 2,000 cycles at full depth of discharge (DOD) and a cathode energy density >850 Wh kg−1. In contrast, the currently most sought-after Li[Ni0.90Co0.09Al0.01]O2 cathode loses ~40% of its initial capacity within 500 cycles at full DOD. Cycling stability is achieved by radially aligned primary particles with [003] crystallographic texture that effectively dissipate the internal strain occurring in the deeply charged state, while the substitution of Ni3+ with higher valence ions induces ordered occupation of Ni ions in the Li slab and stabilizes the delithiated structure. Nickel-rich layered oxide cathodes are at the forefront of the development of automobile batteries. The authors report an atomic and microstructural engineering design for a Li[Ni0.90Co0.09Ta0.01]O2 cathode that exhibits outstanding long-term cyclability and high energy at full depth of discharge in full cells.
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