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Synthesis and electrochemical properties of Li2FeSiO4/C/Ag composite as a cathode material for Li-ion battery

Li2FeSiO4/C/Ag 复合正极材料的合成与性能研究

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Abstract

Li2FeSiO4 is deemed to be a potential candidate for large-scale applications because of its abundance, low cost and high safety, etc. Unfortunately, its low conductivity, resulting in poor rate performance, has become a main obstacle to its applications in power battery and energy storage system. In this work, C-Ag coated Li2FeSiO4 is introduced to improve the innate electronic conductivity and Li-ion diffusion ability. The results demonstrate that Li2FeSiO4/C/Ag composite exhibits better electrochemical performance. It possesses a specific discharge capacity of 152, 121, 108 mA∙h/g at 0.2C, 5C and 10C, respectively. At the same time, the Li2FeSiO4 /C/Ag composite shows good cycle stability and a capacity retention ratio of 97.9% after 100 cycles at 1C.

摘要

Li2FeSiO4 正极材料因其资源丰富、成本低、安全性能高等优点备受研究者关注,但其电导率低, 倍率性能较差,极大地限制在动力和储能领域的应用。针对上述问题,本文采用固相法合成C 和Ag 共包覆的Li2FeSiO4,以提高其电子电导率和离子扩散系数。结果表明:与Li2FeSiO4/C 复合物相比, Li2FeSiO4/C/Ag 复合物具有较好的电化学性能,在0.2C、5C 和10C 下的放电比容量分别为152、121 和108 mA∙h/g;1C 下循环100 次后,其放电容量保留为97.9%。

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Authors and Affiliations

  1. Hunan Province Cooperative Innovation Center for the Construction & Development of Dongting Lake Ecological Economic Zone, College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde, 415000, China

    Yi-qun Tang  (唐轶群), Xi Liu  (刘喜), Xiao-bing Huang  (黄小兵), Xiang Ding  (丁祥), Shi-biao Zhou  (周诗彪) & Yuan-dao Chen  (陈远道)

  2. Key Laboratory of Preparation and Application of Environmental Friendly Materials of Ministry of Education, Jilin Normal University, Changchun, 130103, China

    Xiao-bing Huang  (黄小兵)

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  1. Yi-qun Tang  (唐轶群)
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  2. Xi Liu  (刘喜)
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  3. Xiao-bing Huang  (黄小兵)
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  4. Xiang Ding  (丁祥)
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Correspondence to Xiao-bing Huang  (黄小兵).

Additional information

Foundation item: Project(21771062) supported by the National Natural Science Foundation of China; Project(2016JJ2092) supported by the Hunan Provincial Natural Science Foundation, China; Project(2019013) supported by the Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, China

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Tang, Yq., Liu, X., Huang, Xb. et al. Synthesis and electrochemical properties of Li2FeSiO4/C/Ag composite as a cathode material for Li-ion battery. J. Cent. South Univ. 26, 1443–1448 (2019). https://doi.org/10.1007/s11771-019-4100-0

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