期刊
ACS ENERGY LETTERS
卷 4, 期 6, 页码 1394-1400出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00733
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资金
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Ministry of Trade, Industry and Energy of the Korean government [20154010200840]
- Global Frontier R&D Programme on the Center for Hybrid Interface Materials (HIM), by the Ministry of Science and ICT [2013M3A6B1078875]
A series of Ni-enriched Li[NixCoyAlz]O-2 cathodes (x = 0.80-0.95) were synthesized and evaluated comprehensively to investigate the capacity fading mechanism. Capacity retention was shown to be strongly related to the extent of microcracking within the secondary particles. Moreover, the range and limit of the depth of discharge (DOD), which determined the extent of microcracking, critically affected the cycling stability such that the extremely Ni-rich Li[Ni-0.95 Co0.04Al0.01]O-2, cathode cycled at an upper DOD of 60% exhibited the poorest capacity retention. The anisotropic strain produced by the H2-H3 phase transition was not fully relieved, and persistent microcracks in the discharged state (3.76 V) allowed the electrolyte to penetrate the particle interior. Resultant extended exposure of the interior primary particles within secondary particle to electrolyte attack accelerated structural damage and eventually undermined the mechanical integrity of the cathode particles.
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