期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008301
关键词
LiNi0.8Co0.1Mn0.1O2 cathode; lithium-ion battery; passivation; phosphorization; surface modification
类别
资金
- National Natural Science Foundation of China [52072298, 51802261]
- Natural Science Foundation of Qinghai Province of China [2020-ZJ-910]
- Natural Science Foundation of Shaanxi [2020JC-41]
- Joint Foundation of Shaanxi [2019JLP-04]
- Xi'an Science and Technology Project of China [201805037YD15CG21(20)]
- China Postdoctoral Science Foundation [2019M653705]
- Natural Science Basic Research Program of Shaanxi [2019JQ-748]
By designing an ultrathin and stable interface, the capacity retention and operating voltage stability of the cathode at a high cut-off voltage are significantly enhanced, while detrimental factors are restrained, leading to improved cyclability and rate capability of the battery.
The fast capacity/voltage fading with a low rate capability has challenged the commercialization of layer-structured Ni-rich cathodes in lithium-ion batteries. In this study, an ultrathin and stable interface of LiNi0.8Mn0.1Co0.1O2 (NCM) is designed via a passivation strategy, dramatically enhancing the capacity retention and operating voltage stability of cathode at a high cut-off voltage of 4.5 V. The rebuilt interface as a stable path for Li+ transport, would strengthen the cathode-electrolyte interface stability, and restrain the detrimental factors for cathode-electrolyte interfacial reactions, intergranular cracking and irreversible phase transformation from layered to spinel, even salt-rock phase. The as-optimized NCM displays a higher cyclability (i.e., 206.6 mA h g(-1) at 0.25 C (50 mA g(-1)) with 92.0% capacity retention over 100 cycles) and a better rate capability (141.0 and 112.6 mA h g(-1) at 12.5 and 25 C, respectively) than pristine NCM (205.0 mA h g(-1) with 73.0% capacity retention at 0.25 C; 120.9 and 93.1 mA h g(-1) at 12.5 and 25 C, respectively).
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