Solvents adjusted pure phase CoCO3 as anodes for high cycle stability
Liming Liu, Xiaoxiao Huang, Zengyan Wei, Xiaoming Duan, Bo Zhong, Long Xia, Tao Zhang, Huatao Wang, Dechang Jia, Yu Zhou, Rui Zhang
Abstract
Abstract CoCO 3 with high theoretical capacity has been considered as a candidate anode for the next generation of lithium-ion batteries (LIBs). However, the electrochemical performance of CoCO 3 itself, especially the cyclic stability at high current density, hinders its application. Herein, pure phase CoCO 3 particles with different particle and pore sizes were prepared by adjusting the solvents (diethylene glycol, ethylene glycol, and deionized water). Among them, CoCO 3 synthesized with diethylene glycol (DG-CC) as the solvent shows the best electrochemical performance owing to the smaller particle size and abundant mesoporous structure to maintain robust structural stability. A high specific capacity of 690.7 mAh/g after 1000 cycles was achieved, and an excellent capacity retention was presented. The capacity was contributed by diverse electrochemical reactions and the impedance of DG-CC under different cycles was further compared. Those results provide an important reference for the structural design and stable cycle performance of pure CoCO 3 .