微扩层鳞片石墨负极材料的制备及电化学性能研究

无机材料学报, 2013, 28(9): 931-936. doi: 10.3724/SP.J.1077.2013.12698

微扩层鳞片石墨负极材料的制备及电化学性能研究

1.湖南大学材料科学与工程学院,长沙,410082

2.湖南大学材料科学与工程学院,长沙,410082

3.湖南大学材料科学与工程学院,长沙,410082

4.湖南大学材料科学与工程学院,长沙,410082

基金项目: Special Scientific Fund Item for Non-profit Public Industry of Ministry of Land and Resources(201011031) 国土资源部公益性行业科研专项经费项目(201011031) 湖南省国土资源厅科技项目(2010-08) Fundamental Research Funds for the Central University(531107040188) 中央高校基本科研业务费专项基金(531107040188) Science and Technology Programs of Land and Resources Bureau of Hunan(2010-08)

关键词：负极材料 , 鳞片石墨 , 电化学性能 , 倍率性能 , 石墨层间化合物

Preparation and Electrochemical Performance of Flake Graphite Anode Materials with Slightly Expanded Interlayer

Keywords： anode material , flake graphite , electrochemical performance , rate capacity , graphite intercalation compounds

研究了微扩层鳞片石墨的制备工艺、晶体结构、表面形貌以及电化学行为之间的关系.采用XRD和SEM等手段分析了石墨样品的结构和表面形貌；采用比表面积分析仪、振实密度仪分别测试了样品的BET比表面积和振实密度等指标；并应用恒电流充放电测试、循环伏安技术和电化学阻抗法(EIS)研究了微扩层处理前后石墨负极的电化学行为.结果表明,经微扩层处理后,石墨的平均层间距d002略微增大,平均晶粒尺寸Lc、La减小,颗粒的表面更光滑.微扩层石墨的首次库伦效率从91.6％提高至92.7％,可逆容量由345.5 mAh/g提高至379.8 mAh/g.且其循环性能与倍率放电性能均得到有效改善,同时石墨的嵌锂电位略有提高,锂离子从石墨中脱出更容易,电化学可逆性提高.分析是由于微扩层后石墨负极材料脱嵌锂反应的活化能降低所致.

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