Solvents adjusted pure phase CoCO3 as anodes for high cycle stability

Journal of Advanced Ceramics

Rui Zhang¹  Dechang Jia²  Yu Zhou²  Xiaoxiao Huang²  Liming Liu²  Xiaoming Duan²  Zengyan Wei²  Tao Zhang³  Bo Zhong³  Huatao Wang³  Long Xia³ 

[1] College of Materials Science and Engineering, Hunan University, 410082, Changsha, China;Department of Materials Science, School of Material Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China;Key Laboratory of Advanced Structural Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, 150001, Harbin, China;School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 264009, Weihai, China;

关键词: lithium ion battery (LIB);    cobalt carbonate;    solvothermal method;    morphological control;    solvent;    pure phase;   

DOI  :  10.1007/s40145-020-0453-y

来源: Springer

【 摘 要 】

CoCO3 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 CoCO3 itself, especially the cyclic stability at high current density, hinders its application. Herein, pure phase CoCO3 particles with different particle and pore sizes were prepared by adjusting the solvents (diethylene glycol, ethylene glycol, and deionized water). Among them, CoCO3 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 CoCO3.

【 授权许可】

CC BY