Abstract
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.
Highlights
Out of the concern for energy and environment, lithium-ion batteries (LIBs) have been widely studied because of their high energy density, low pollution, and compatibility with existing equipment [1,2,3,4]
J Adv Ceram 2021, 10(3): 509–519 over transition metal oxides (TMOs): (1) easier preparation technology; (2) improved properties (TMCs have even higher specific capacity owing to an additional step of lithium storage reaction provided by CO32– [13,14,15,16])
Chemical state information was studied by using the X-ray photoelectron spectroscopy (XPS) measurement performed on an ESCALAB 250Xi
Summary
Out of the concern for energy and environment, lithium-ion batteries (LIBs) have been widely studied because of their high energy density, low pollution, and compatibility with existing equipment [1,2,3,4]. The cobalt carbonate prepared from diethylene glycol (DG-CC) has a high specific capacity of 690.7 mAh/g at 1 A/g after 1000 cycles, and a high capacity retention with 92.45% It is very rare for a pure cobalt carbonate electrode to have such a stable capacity after 1000 cycles, which is attributed to the structure of the particles adjusted by solvents.
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