化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (12) : 124-128. DOI: 10.19817/j.cnki.issn 1006-3536.2020.12.030

科学研究

硅烷偶联剂表面改性LiMn₂O₄的结构及电化学性能

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Surface treatment on structure and property of LiMn₂O₄ by silane coupling agent

Wang Sunfa^1,2, Feng Yanyan³, Zhang Xiaopeng¹, Feng Lanlan¹, Yuan Zhenluo², Fan Guangxin^1,3,4, Liu Baozhong²

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Received		Published
2019-09-02		2020-12-20
Issue Date	Revised Date
2021-01-21	2019-09-02

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摘要

硅烷偶联剂经高温分解对锂离子电池阴极材料LiMn₂O₄表面改性,对材料的形貌、结构及综合电化学性能进行表征。结果表明:经硅烷偶联剂处理后,SiO₂均匀地包覆在材料表面,不影响LiMn₂O₄的晶体结构和形貌,但明显地改善了材料的电化学性能。其中SiO₂包覆质量为1%时,LiMn₂O₄的综合电化学性能最佳:经100次充放电循环后,LiMn₂O₄的放电比容量和容量保持率由包覆前的93.88mAh/g和88.03%分别提高到包覆后的112.05mAh/g和94.54%。这归因于包覆层可抑制电解液与电极材料之间发生的副反应,减小固体电解质界面(SEI)膜阻抗(R_f),从而提高材料的结构稳定性和Li⁺在迁入/脱迁过程中的扩散能力。

Abstract

Particle surface of LiMn₂O₄ cathode material for lithium ion battery was modified by a pyrolysis of silane coupling agent.The morphology,structure and comprehensive electrochemical properties of the materials were characterized systematically.The results shown that the SiO₂ obtained from silane coupling agent was coated on the surface of the material.The coating did not affect the crystal structure and morphology,but the electrochemical properties of LiMn₂O₄ were improved significantly.The optimum comprehensive performance of the cathode can be obtained at SiO₂ coating amount of 1wt%.The initial discharge specific capacity and capacity retention (after 100 charge-discharge cycles) of LiMn₂O₄ can be increased from 93.88mAh/g and 88.03% to 112.05mAh/g and 94.54% respectively after coating.The reason for this was that the coating layer can inhibit the side reactions between electrolyte and electrode material,which reduced SEI film impedance(R_f),stabilized the structure of the materials and resulted in the improvement the diffusion ability of Li⁺ during the insertion/deinsertion process.

关键词

阴极材料 / 锰酸锂 / 硅烷偶联剂 / 包覆改性 / 电化学性能

Key words

cathode material / LiMn₂O₄ / silane coupling agent / coating modification / electrochemical property

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硅烷偶联剂表面改性LiMn₂O₄的结构及电化学性能[J]. 化工新型材料, 2020, 48(12): 124-128 DOI:10.19817/j.cnki.issn 1006-3536.2020.12.030

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