期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 41, 页码 27795-27802出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09918
关键词
hollow nanospheres; chemical adsorption; SnO2; Li-S batteries; reaction kinetics
资金
- National Natural Science Foundation of China [51162006, 51362009]
- International S&T Cooperation Program of Hainan Province [KJHZ2015-02]
- Key Programs of Hainan Province [ZDXM2015118]
Double-shell SnO2@C hollow nanospheres were synthesized by a template method, and then the sulfur was loaded to form a cathode material of S/SnO2@C composite. In Li-S batteries, it delivered a high initial specific capacity of 1473.1 mAh/g at a current density of 200 mA/g, and the capacity retention was even tip to 95.7% over 100 cycles 4 3200 mA/g, i.e., a capacity fade rate of only 0.043% per cycle. These good electrochemical performances should be attributed to, the SnO2@C hollow nanospheres. They can enhance the electronic conductivity by the outside carbon shell, and confine the lithium polysulfides by S-Sn-O and S-C chemical bonds to suppress the shuttle effect. Besides, the hollow nanospheres can readily accommodate the sulfur/sulfides to prevent the electrical/mechanical failure of the cathode, instead of their agglomeration oh the external surface of SnO2@C.
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