Li Zhenbang, Tian Fei, Li Yan, Lei Danni, Wang Chengxin
State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen (Zhongshan) University, Guangzhou, 510275, China.
Small. 2022 Dec;18(50):e2204875. doi: 10.1002/smll.202204875. Epub 2022 Oct 31.
The insertion type materials are the most important anode materials for lithium-ion batteries, but their insufficient capacity is the bottleneck of practical application. Here, LiAl O nanowires with high theoretical capacity and Li-ions diffusion coefficient are prepared and studied as an insertion anode material, which exhibits zero-strain properties upon electrochemical cycling. However, the poor electronic conductivity of LiAl O definitely sacrifices the capacity and limits the rate performance. Therefore, compact LiAl O and carbon composite are further synthesized, in which nanosized LiAl O particles are uniformly embedded in an amorphous carbon matrix. It displays a reversible capacity of 490.9 mAh g at 1 A g , and the capacity rises continuously to 996.8 mAh g after 1000 cycles due to the interfacial storage mechanism, that the excess Li ions can be accommodated in the grain boundaries and C/LiAl O interfaces.
