以月桂酸为碳源,磷酸三丁酯为反应物和络合剂,采用溶胶-凝胶法合成了LiMnPO4/C锂离子电池复合正极材料.利用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对其晶体结构和微观形貌进行表征.结果表明,在700℃下焙烧制备的材料为结晶良好的纯相橄榄石结构；具有类球形微米级大颗粒形貌,由粒径50～100 nm的小颗粒堆积而成,小颗粒表面包覆一层较均匀的碳层.循环伏安曲线和充放电测试表明,LiMnPO4/C复合材料具有优良的电化学性能.在室温0.05C和0.5C倍率下,首次放电容量分别为141和113 mAh/g,并具有良好的循环稳定性和高低温充放电性能.
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