研究L iCoO2(或L1.05Co1/3N i1/3Mn3O2)/L ixC6锂离子电池材料的热分解特性以及锂离子电池在加热、过充、短路等情况下的爆炸机理.实验表明,50~350℃之间负极表面存在SEI膜的分解、L ixC6与电解液乃至L ixC6与PVDF等3种放热反应,电解液于178℃时开始放热,L i1-xCo1/3N i1/3Mn1/3O2的热分解反应起始于230℃.锂离子电池在150℃加热时爆炸,1.5 C过充至15 m in时爆炸,短路情况下不发生爆炸.
The heat character of Lithium-ion battery materials and explosion mechanism of Lithium-ion cells under the overcharge,short-circuit and other abuse behavior are tested by C_(80) calorimeter,_()DSC and charge-discharge instrument.SEI reactions,Li_xC_(6)/electrolyte and Li_xC_(6)/PVDF reactions take place at the anodes.Electrolyte and solvent reactions happen after 178℃ and Li_(1-x)Co_(1/3)Ni_(1/3)Mn_(1/3)O_(2) decomposes after 230℃.The batteries explode at 150℃ oven test or 1.5C,5.5 V overcharge and do not explode at short-circuit.
[1]Tob ish im a S I,Yam ak i J I.A consideration of lith iumcell safety[J].J.Power Sources,1999,(81~82):882~886.
[2]Spotn itz R,Franklin J.Abuse behavior of h igh-power,lith ium-ion cells[J].J.Power Sources,2003,113:81~100.
[3]B iensan P,S imon B,Peres J P,et al.On safety of lith-ium-ion cells[J].J.Power Sources,1999,(81~82):906~912
[4]Kawamura T,K imura A,Egash ira M,et al.Therm alstab ility of alkyl carbonate m ixed-solvent electrolytes forlith ium ion cells[J].J.Power Sources,2002,104:260~264.
[5]M acNe il D D,Lu Z H,Chen Z H,et al.A comparisonof the electrode/electrolyte reaction at elevated tempera-tures for various L i-ion battery cathodes[J].J.PowerSources,2002,108:8~14.
[6]R ichard M N,Dahn J R.Accelerating rate calorim etrystudy on therm al stab ility of lith ium intercalated graph itein electrolyte.I.experim ental[J].J.E lectrochem.Soc.,1999,146(6):2068~2077.
[7]Baba Y,Okada S,Yam ak i J I.Therm al stab ility ofL ixCoO2cathode for lith ium ion battery[J].So1 id StateIon ics,2002,148:3 ll~316.
