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- 2018
锂离子电池负极材料Li3V2(BO3)3/C 复合材料的合成及电化学性能研究
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Abstract:
摘要 本文以草酸锂、五氧化二钒、硼酸为原料，二水合草酸为碳原和还原剂，无水乙醇为分散剂，采用球磨法合成了Li3V2(BO3)3/C（LVB/C）复合材料前驱体，后经高温热处理得到LVB/C复合材料. 采用TG-DTA技术对前驱体进行了热分析，通过XRD、SEM、EDS等技术研究了烧结条件对 LVB/C 材料的晶体结构、微观形貌、含碳量的影响. 通过恒流充放电测试、循环性能测试、循环伏安测试和电化学阻抗测试等技术研究了烧结条件对 LVB/C 材料电化学性能的影响. 电化学测试结果表明，800 ℃下烧结10 h得到的样品电化学性能最佳，在50 mA？g-1电流密度下，首次充放电比容量分别为427.6 mAh？g-1和669.1 mAh？g-1，循环10次后，容量保持率分别为55.4 %和35.2 %
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