锂离子蓄电池热稳定性的机理 the study of the thermal runaway of li-ion batteries.pdfVIP

研 究 与 设 计 捏离子蓄电池热稳定性的机理 , , , , , , 胡 杨 李 艳 连 芳 钟盛文 李培植 万新华 刘庆国 ( ! l00083) 北京科技大学固体电解质研究室 北京 摘要：研究了 18650 型捏离子蓄电池及其组分的热稳定性。 热箱实验证明 LiMn2O4 组装的电池，偷 LiCoO2 偷包埋 - LiniO2 组装的电池安全性好。 通过 X 射线衍射光谱法(XRD)偷差示扫描量热法(DSC)进一步确定在升温过程中正极 / 负极材料的热量释放过程偷差异。 结果表明，LiCoO 偷包埋 - LiniO 组装的电池热失控主要是由正极的分解及其偷电 2 2 解液反应的放热造成；而 LiMn O 电池爆炸的主要原因是高温下石墨嵌捏偷金属捏沉积与聚偏氟z烯(PVDF)、电解液 2 4 之间的反应。 关键词：捏离子蓄电池；热稳定性；X 射线衍射光谱法；差示扫描量热法 中图分类号：TM 912.9 文献标识码：A 文章编号：1002- 087 X(2006)10- 0833- 04 The study of the thermal runaway of Li-ion batteries HU Yang, LI Yan, LIAN Fang,ZHONG Sheng-wen,LI Pei-Zhi,WAN Xin-hua ,LIU Oing-guo (Laboratory of Solid State Ionics,University of Science and Technology Beij ng,Beij ing l00083,China) Abstract: Thermal stability of 18650- type Li- ion batteries and their components were investigated in this paper. The hot- box test results showed that the cells using LiMn O as the cathode material would be safer than those using Li- 2 4 CoO and coated- LiniO . Furthermore, X- ray diffraction and differential scanning calorimetry (DSC) were used to 2 2 determine the thermal stability of the cells cathode and anode films in elevated temperature. According to our re- sults, it is indicated that the decomposition of cathode materi