Facile-synthesized amorphous CoCO3 for high-capacity lithium-ion battery anode
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Transition metal carbonates are high specific capacity and high initial coulombic efficiency anode materials of the lithium-ion batteries (LiBs). Herein, molecular dynamics simulation found the amorphous instead of the crystallized CoCO3 is more favorable for Li-ion storage. Guided by the dynamics simulations results, the amorphous CoCO3 was synthesized by a facile one-step precipitation method and then compounded with reduced graphene oxide (RGO) sheets. The as-synthesized CoCO3/RGO shows one of the best electrochemical performances compared with the recently reported CoCO3-based anodes. CoCO3/RGO delivered a reversible capacity of 881.4 mAh g−1 at 50th cycle under the current density of 100 mA g−1 and 1250.5, 898.7, 718.3 mAh g−1 at 1st, 2nd, and 50th cycles under the current density of 200 mA g−1. This work could provide a rational design and manufacture method of high-performance carbonate-based LiB anodes.
KeywordsCoCO3 Amorphous Lithium-ion battery Carbonate
This work was financially supported by the 973 program of Ministry of Science and Technology of the People’s Republic of China (No. 2013CB934700), the National Natural Science Foundation of China (No. 51222305 and 51673123) and the Program for New Century Excellent Talents in University (No. NCET-12-0386). We also thank the Analytical and Testing Center of Sichuan University for providing Materials studio, and we are also grateful to Daichuan Ma for his help of computational simulation.
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