Synthesis and modification mechanism of vanadium oxide coated LiFePO4cathode materials with excellent electrochemical performance

Jing Geng; Zhengguang Zou; Tianxing Wang; Shuchao Zhang; Wenqin Ling; Xiaoxiao Peng; Fangan Liang

doi:10.1088/1361-6528/acec55

Synthesis and modification mechanism of vanadium oxide coated LiFePO₄cathode materials with excellent electrochemical performance

Nanotechnology. 2023 Aug 18;34(44). doi: 10.1088/1361-6528/acec55.

Authors

Jing Geng¹, Zhengguang Zou^{1

2}, Tianxing Wang¹, Shuchao Zhang¹, Wenqin Ling¹, Xiaoxiao Peng¹, Fangan Liang¹

Affiliations

¹ College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China.
² Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials, Guilin University of Technology, Guilin, 541004, People's Republic of China.

PMID: 37527643
DOI: 10.1088/1361-6528/acec55

Abstract

In an era of rapid industrial development, such that the demand for energy is increasing daily, lithium-ion batteries are playing a dominant role in energy storage devices due to their high safety and low cost. However, it is still a challenge for the preparation of advanced cathodes, which can determine the battery performance, with stable structures and fast diffusion of Li⁺. This is especially the case for lithium iron phosphate (LFP), a cathode material with severe limitations due to its low conductive efficiency. To improve its conductivity, LFP was compounded with defect-modified V₂O₅to prepare LFP/V/C materials with excellent electrochemical properties, which exhibited an initial capacity of 138.85 mAh g^-1and 95% retention after 500 charge/discharge cycles at a current density of 5 C. Also, the effect of defects on ionic diffusion was discussed in detail by means of density function theor (DFT) calculations, confirming that the improvement of electrochemical performance is closely related to the introduction of hybrid conductive layers of surface cladding.

Keywords: LiFePO4; cathode; coated; modifications; synthesis.