期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 17, 页码 19423-19430出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c00729
关键词
prelithiation; SnO2; Coulombic efficiency; full-cell; lithium-ion batteries
资金
- National Science Foundation of China [21902120]
- Fundamental Rese arch Funds for the Central Universities [2042019kf0018]
- Vehicle Technology Office of the U.S. DOE through the Advanced Battery Materials Research (BMR) Program [DE-SC0012704]
SnO2 is an attractive anodic material for advanced lithium-ion batteries (LIBs). However, its low electronic conductivity and large volume change in lithiation/delithiation lead to a poor rate/cycling performance. Moreover, the initial Coulombic efficiencies (CEs) of SnO2 anodes are usually too low to build practical full LIBs. Herein, a two-step hydrothermal synthesis and pyrolysis method is used to prepare a SnO2/C nanocomposite, in which aggregated SnO2 nanosheets and a carbon network are well-interpenetrated with each other. The SnO2/C nanocomposite exhibits a good rate/cycling performance in half-cell tests but still shows a low initial CE of 45%. To overcome this shortage and realize its application in a full-cell assembly, the SnO2/C anode is controllably prelithiated by the lithiumbiphenyl reagent and then coupled with a LiCoO2 cathode. The resulting full LIB displays a high capacity of over 98 mAh g(LCO)(-1) in 300 cycles at 1 C rate.
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