The extremely low electrical conductivity and ion-diffusion coefficient of Li2FeSiO4 limits its application as a cathode material in lithium-ion batteries.Therefore,in situ boron-doped Li2FeSi1-xBxO4-δ/C(x=0,0.01,0.03,0.05 and 0.07)at the Si site was prepared via the solid-state reaction method using pitch as the carbon source.B doping in the lattice structure and a carbon coating on the surface of the composites could effectively enhance the Li+/electron con-ductivity.Moreover,the reduced particle size of the active material with the relatively high specific area via boron-doped modification could improve the wettability between the electrolyte and cathode.With the synergistic effect of appropriate boron doping and carbon coating,it exhibits a good rate performance,specific capacity,and cycling per-formance.As a result,the as-prepared Li2FeSi0.95B0.05O4-δ/C cathode showed a high discharge capacity of 160.7 mAh·g-1 at 0.2C,and the capacity retention rate was 96％after 100 cycles at 1.0C.This work presents an effective path for designing advanced cathode materials for lithium-ion batteries.

Hunan Provincial Key Laboratory of Chemical Power Sources,College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;Hunan Provincial Key Laboratory of Water Treatment Functional Materials,Hunan Provincial Key Laboratory for Control Technology of Distributed Electric Propulsion Aircraft,College of Chemistry and Materials Engineering,Hunan University of Arts and Science,Changde 415000,China;Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery,Changzhou Key Laboratory of Intelligent Manufacturing and Advanced Technology for Power Battery,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China

[1]Hao-Xiang Li;Jia-Hui Zhu;Xiao-Bing Huang;Tao Zhou;Yu-Rong Ren-.Enhancing lithium-ion and electric conductive Li2FeSiO4 cathode through in situ boron-doping and carbon-coating strategy)[J].稀有金属（英文版）,2022(12):4055-4064

Li2FeSi1,xBxO4,Li2FeSi0,95B0

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