期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 47, 页码 41210-41223出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b11942
关键词
lithium-ion batteries; lithium-rich oxide nanowires; spinel/layered heterostructure; mitigated voltage fading; high rate capability
资金
- Natural Science Foundation of Hunan Province [2015JJ2137, 2015JJ6103]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2016B229]
- Key Project of Strategic New Industry of Hunan Province [2016GK4030, 2016GK4005]
Lithium-rich oxide material has been considered as an attractive candidate for high-energy cathode for lithium-ion batteries (LIBs). However, the practical applications are still hindered due to its low initial reversible capacity, severe voltage decaying, and unsatisfactory rate capability. Among all, the voltage decaying is a serious barrier that results in a large decrease of energy density during long-term cycling. To overcome these issues, herein, an efficient strategy of fabricating lithium-rich oxide nanowires with spinel/layered heterostructure is proposed. Structural characterizations verify that the spinel/layered heterostructured nanowires are a self-assembly of a lot of nanoparticles, and the Li4Mn5O12 spinel phase is embedded inside the layered structure. When the material is used as cathode of LIBs, the spinel/layered heterostructured nanowires can display an extremely high invertible capacity of 290.1 mA h g(-1) at 0.1 C and suppressive voltage fading. Moreover, it exhibits a favorable cycling stability with capacity retention of 94.4% after charging/discharging at 0.5 C for 200 cycles and it shows an extraordinary rate capability (183.9 mA h g(-1), 10 C). The remarkable electrochemical properties can be connected with the spinel/layered heterostructure, which is in favor of Li+ transport kinetics and enhancing structural stability during the cyclic process.
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