锂离子电池正极材料的热稳定性  

Thermal Stability of Cathode Materials of Lithium-Ion Battery

作　　者：周新文[1] 代忠旭[1] 张克立[2] 

机构地区：[1]三峡大学化学与生命科学学院,湖北宜昌443002 [2]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2010年第3期258-262,共5页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(20071026);三峡大学人才科研启动基金资助项目(KJ2009B003)

摘　　要：运用热分析方法定性研究了固态LiClO4和LiClO4电解液的热稳定性能,进而对比分析了3种常见锂离子电池正极材料LiNi0.85Co0.15O2,LiMn2O4和LiFePO4的热稳定性能.结果表明,在200~250℃温度范围内,LiClO4电解液不会影响反应体系.充电状态下,Li0.18Ni0.85Co0.15O2与电解液发生反应的温度集中在215℃左右;Li0.15Mn2O4与电解液发生反应的起始温度约为220℃,主要反应集中在250℃左右;Li0.17FePO4与电解液反应主要集中在230℃,但起始反应温度要高于Li0.15Mn2O4,显示出更好的热稳定性.因此,3种材料热稳定性由强到弱的顺序为：LiFePO4,LiMn2O4,LiNi0.85Co0.15O2.The thermal stabilities of solid LiClO4 and LiClO4 electrolyte were studied by thermal analytic methods.Then we discussed the thermal stability of three common cathode materials using differential scanning calorimetry（DSC） method,including LiMn2O4,LiNi0.85Co0.15O2 and LiFePO4.In the range of 200-250 ℃,LiClO4 electrolyte did not affect the system.Li0.18Ni0.85Co0.15O2,Li0.15Mn2O4 and Li0.17FePO4 reacted with LiClO4 electrolyte mostly at 215,250 ℃ and 230 ℃ in the charged states,respectively.But the onset temperature of Li0.17FePO4 reacted with LiClO4 electrolyte was more positive than that of Li0.15Mn2O4.These results indicate that the order of the thermal stability was： LiFePO4LiMn2O4LiNi0.85Co0.15O2.

关 键 词：锂离子电池 差示扫描量热法 LICLO4 LIFEPO4 

分 类 号：O611.4[理学—无机化学]