期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 8, 页码 9268-9276出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20872
关键词
LiNi0.8Co0.1Mn0.1O2; double-shell modification; hybrid nanostructure; structural degradation; cycling stability
资金
- National Natural Science Foundation of China [21071026]
- Outstanding Talent Introduction Project of University of Electronic Science and Technology of China [08JC00303]
- Fundamental Research Funds for the Central Universities, China [ZYGX2019Z008]
Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode is considered to be among the most promising candidates for high-energy-density lithium-ion batteries (LIBs). However, both capacity fading and structural degradation occur during long-term cycling, which extremely limit the commercial applications of NCM811, especially at a high cutoff voltage (>4.3 V). Here, we design a double shell hybrid nanostructure consisting of a Li2SiO3 coating layer and a cation-mixed layer (Fm (3) over barm phase) to improve its electrochemical performance. Consequently, the Si-modified NCM811 electrode shows outstanding cycling stability with a 95.2% capacity retention at 4.3 V after 100 cycles and 87.3% at a 4.5 V high cutoff voltage after 100 cycles. This designed double-shell hybrid nanostructure alleviates side reactions, structural degradation, and internal cracking, effectively enhancing the surface structural stability. This efficient strategy provides a valuable step toward further commercial applications of the LiNi0.8Co0.1Mn0.1O2 cathode and enriches the fundamental understanding of layered cathode materials.
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