Journal of Guangxi Normal University(Natural Science Edition) ›› 2022, Vol. 40 ›› Issue (6): 154-162.doi: 10.16088/j.issn.1001-6600.2021080801

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Synthesis of Li2FeSiO4/C by Solid-State Reaction and Its Lithium Intercalation/de-Intercalation Property

LI Fushao*, XU Yingxian, WU Qingqing, DENG Mingsen*   

  1. Guizhou Provincial Key Laboratory of Computational Nano-Material Science (Guizhou Education University), Guiyang Guizhou 550018, China
  • Received:2021-08-08 Revised:2021-08-31 Online:2022-11-25 Published:2023-01-17

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Abstract: In this paper, Li2FeSiO4 as well as Li2FeSiO4/C was prepared as cathode materials of lithium-ion batteries by direct high temperature solid-sate reaction, and effect of carbonized modification on the structure, electrical conductivity, lithium intercalation/de-intercalation property, and cyclic specific capacity of Li2FeSiO4 was investigated. The result shows that this process of material preparation is economic and scalable. The carbonized composite helps to enhance the electrical conductivity of Li2FeSiO4, and also improves the particle distribution after phase formation reaction of Li2FeSiO4. Most importantly, carbonized composite quite facilitates the lithium intercalation/de-intercalation and greatly promotes the cyclic specific capacity of Li2FeSiO4, and initial discharge capacity of Li2FeSiO4/C under rate of 0.1C reaches above 120 mAh/g, much higher than the 20 mAh/g of Li2FeSiO4. In conclusion, Li2FeSiO4 is a most promising cathode material of lithium-ion batteries, and carbonized modification can overcome the shortcomings of this cathode material in aspects of electrical conductivity, electrochemical performance, and so on.

Key words: lithium-ion batteries, silicates, cathode material, lithium intercalation/de-intercalation property, electrochemical techniques

CLC Number: 

  • TM911
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