期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 7, 页码 4567-4575出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00632
关键词
mixed-metal sulfides; ion diffusion; pseudocapacitive effect; anode; sodium-ion battery
资金
- National Natural Science Foundation of China [51802356, 51872334, 51572299]
- Innovation-Driven Project of Central South University [2018CX004]
Metal sulfides are promising anodes for sodium-ion batteries because of their high theoretical capacities. However, they also suffer from the limitations of poor cycling stability and rate performance caused by volumetric strain. Here, trimetallic hybrid sulfide (Ni, Fe, Co)S-x nanocrystals embedded into nitrogen-doped carbon nanocubes are successfully obtained with abundant channels for ion diffusion, high specific surface area for a pseudocapacitive effect, and enough voids to buffer volumetric strain. As anode material for a sodium-ion battery, the hybrid sulfides exhibit highly reversible specific capacity, good rate capability, and cycling performance. Such mixed-metal sulfides with novel physical or chemical properties may also be extended to other emerging fields.
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