Li Feifei, Wang Gongwei, Zheng Dong, Zhang Xiaoxiao, Abegglen Caleb J, Qu Huainan, Qu Deyang
School of Material Science & Engineering, Wuhan Institute of Technology, Wuhan 430073, China.
Department of Chemistry, Wuhan University, Wuhan 430072, China.
ACS Appl Mater Interfaces. 2020 Apr 29;12(17):19423-19430. doi: 10.1021/acsami.0c00729. Epub 2020 Apr 16.
SnO 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 SnO anodes are usually too low to build practical full LIBs. Herein, a two-step hydrothermal synthesis and pyrolysis method is used to prepare a SnO/C nanocomposite, in which aggregated SnO nanosheets and a carbon network are well-interpenetrated with each other. The SnO/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 SnO/C anode is controllably prelithiated by the lithium-biphenyl reagent and then coupled with a LiCoO cathode. The resulting full LIB displays a high capacity of over 98 mAh g in 300 cycles at 1 C rate.
SnO是一种用于先进锂离子电池（LIBs）的有吸引力的阳极材料。然而，其低电子电导率以及锂化/脱锂过程中的大体积变化导致其倍率/循环性能较差。此外，SnO阳极的初始库仑效率（CEs）通常过低，无法构建实用的全LIBs。在此，采用两步水热合成和热解方法制备了一种SnO/C纳米复合材料，其中聚集的SnO纳米片和碳网络相互良好地相互渗透。SnO/C纳米复合材料在半电池测试中表现出良好的倍率/循环性能，但初始CE仍较低，为45%。为克服这一不足并实现其在全电池组装中的应用，通过锂-联苯试剂对SnO/C阳极进行可控预锂化，然后与LiCoO阴极耦合。所得的全LIB在1 C倍率下300次循环中显示出超过98 mAh g的高容量。
