Graphene-Oxide-Coated CoP2@C Anode Enables High Capacity of Lithium-Ion Batteries

Author:

Zhang Wei1,Xie Hangxuan1,Dou Zirui1,Hao Zhentao1,Huang Qianhui1,Guo Ziqi1,Wang Chao1,Miao Kanghua2,Kang Xiongwu2ORCID

Affiliation:

1. China Southern Power Grid Technology Co., Ltd., Guangzhou 510080, China

2. New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China

Abstract

Cobalt diphosphides (CoP2) show a high theoretical capacity and hold great promise as anode materials for lithium-ion batteries (LIBs). However, the large variation in the volume and structure of CoP2 caused during lithium-ion insertion and extraction results in electrode fragmentation and a compromised solid electrolyte interface, ultimately leading to poor cycling performance. Herein, a composite of CoP2 nanoparticles encapsulated in carbon matrix has been successfully synthesized by carbonization of Co-MOF-based zeolitic imidazolate frameworks (ZIF-67) and sequential phosphorization and further wrapped in graphene oxide (CoP2@C@GO). The formation of CoP2 was confirmed by X-ray diffraction, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The morphology of CoP2@C with and without GO wrapping was examined by scanning electron microscopy and transmission electron spectroscopy. It was demonstrated that the decoration of GO significantly reduces the polarization of CoP2@C electrodes, enhancing their charge capacity and cycling stability as an anode material for LIBs. After 200 cycles, they deliver a capacity of 450 mAh·g−1.

Publisher

MDPI AG

Subject

Psychiatry and Mental health,Health Policy,Neuropsychology and Physiological Psychology

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