Synergistic double-shell coating of graphene and Li 4 SiO 4 on silicon for high performance lithium-ion battery application

Qing Ai, Peng Zhou, Wei Zhai, Xiaoxin Ma, Guangmei Hou, Xiaoyan Xu, Lina Chen, Deping Li, Long Chen, Lin Zhang, Pengchao Si, Jinkui Feng, Qijin Chi, Lijie Ci*

*Corresponding author for this work

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Abstract

We demonstrate that the double-shell coating of graphene and Li4SiO4 on commercial Si nanoparticles as an effective strategy for improving the anode of lithium ion batteries to overcome the two critical concerns, i.e. rapid capacity decay and inferior coulombic efficiency caused by the large-volume changes. It is proven that the double-shell coating enables the formation of a stable hybrid solid electrolyte interphase, leading to much higher coulombic efficiency and longer cycling stability of the Si anodes. Furthermore, the rate performance of Si is significantly enhanced by the outstanding electrical conductivity of inner graphene layers and the excellent ionic conductivity of Li4SiO4 out-shell. The overall results suggest that this new strategy holds promising perspectives in optimizing electrochemical performances of Si anodes, which should promote their practical applications for next-generation lithium ion batteries with increasingly demanded energy density.
Original languageEnglish
JournalDiamond and Related Materials
Volume88
Pages (from-to)60-66
Number of pages7
ISSN0925-9635
DOIs
Publication statusPublished - 2018

Cite this

Ai, Q., Zhou, P., Zhai, W., Ma, X., Hou, G., Xu, X., Chen, L., Li, D., Chen, L., Zhang, L., Si, P., Feng, J., Chi, Q., & Ci, L. (2018). Synergistic double-shell coating of graphene and Li 4 SiO 4 on silicon for high performance lithium-ion battery application. Diamond and Related Materials, 88, 60-66. https://doi.org/10.1016/j.diamond.2018.06.023