5 years ago

Defects Enhanced Performance of 3D Graphene Anode in Lithium-ion Battery.

Xinyi Chen, Deng Long, Zongmin Zheng, Alan M C Ng, Miao Lu, Hongchen Guo
Morphological defects were generated in undoped 3D graphene structure via the involvement of ZnO and Mg(OH)2 intermediate nanostructure layer between twice of vapor deposited graphene. Once the intermediate layer was etched, the 3D graphene losed the support and shrank, during which many morphological defects were formed. The electrochemical performance of the derived defective graphene as the anode of Li-ion battery have been significantly improved from ~382 mAh/g to ~2204 mAh/G at 0.5 A/g compared to normal 3D graphene. The derived defective graphene exhibited an initial capacity of 1009 mAh/g and retention of 83% at 4 A/g for 500 cycles, and ~330 mAh/g at high rate 20 A/g. The complicated defects such as wrinkles, pores, particles formed during the etching of intermediate layer, were considered to be contributing to the improvement of electrochemical performance.

Publisher URL: http://doi.org/10.1088/1361-6528/aa98f8

DOI: 10.1088/1361-6528/aa98f8

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