期刊
ENERGY STORAGE MATERIALS
卷 33, 期 -, 页码 239-249出版社
ELSEVIER
DOI: 10.1016/j.ensm.2020.08.020
关键词
Lithium-ion batteries; Ni-rich cathode; Self-discharge; Operando xrd; Temperature adaptability
资金
- National Natural Science Foundation of China [51602261, 51711530037]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [160-QP-2016]
- Fundamental Research Funds for the Central Universities [3102019JC005]
- Young Talent Fund of University Association for Science and Technology in Shaanxi, China
The application range of nickel-rich layered oxide cathodes is seriously hampered by the structural collapse, cycling decay and self-discharge issues under extreme temperature conditions. In this study, the real-time phase evolution of the LiNi0.8Mn0.1Co0.1O2 (NMC-811) cathode is investigated at the idling charged state and upon the high temperature galvanostatic cycling. Correspondingly, a quaternary system, consisting of LiNi0.79Mn0.1Co0.1Al0.01O2 (NMCA), with the primary particles encapsulated by the glassy LiBO2 network is proposed; the multiscale strategy collectively suppresses the performance deterioration at the static and dynamic processes, such as the unfavorable phasic transition from the layered to rock-salt structure and the microcrack evolution. When pairing this modified NMCA cathode at high loading mass ( > 450 g m(-2) for double side deposition) with the Si/C composite anode in the standard 18,650 cylinder-type cells, the prototype realizes the simultaneous robust capacity retention (similar to 85% for 1000 cycles at 0.5 C), practical energy density of similar to 245.8 Wh kg(-1), effective mitigation of the self-discharge process at the elevated temperatures as well as 92% capacity retention even upon the operation at -20 degrees C. The scalability of our proposed modification strategy enables the feasible practical use of NMCA cathode within a broader temperature range.
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