主要研究了纳米氧化铝包覆对LiFePO4/C复合正极材料结构和电化学特性的影响.采用溶胶-凝胶方法把纳米氧化铝包覆在商业LiFePO4/C颗粒表面.研究了Al2O3包覆层的量对LiFePO4电极在室温和高温充放电性能的影响.结果显示:2wt％Al2O3包覆层能有效增加电池的循环容量,能延缓电池在高温条件下充放电的容量衰减,减小电极的界面阻抗.这归因于氧化铝包覆层对磷酸铁锂晶粒的表面起保护作用,减少电解液对磷酸铁锂晶粒表面的腐蚀,从而改善循环过程中磷酸铁锂的表面结构的完整和稳定,确保锂离子扩散通道的畅通.
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