针对锂离子电池存在的起火和爆炸风险,以储能用3.2 V 100 Ah磷酸铁锂锂离子电池和3.6 V 90 Ah三元LiNi0.5Co0.2Mn0.3O2(NCM523)锂离子电池为对象,采用外部加热的滥用方式,研究不同正极体系锂离子电池的热失控特性.取样磷酸铁锂锂离子电池在外部加热条件下不会燃烧,仅释放大量白色烟雾,电池热失控最高温度为534.2℃,总放热量为0.162 MJ,最高热释放速率为1.81 kW;取样三元锂离子电池在外部加热条件下发生燃烧和喷射,电池热失控最高温度为1052.4℃,总放热量为3.147 MJ,最高热释放速率为134.85 kW;磷酸铁锂与三元锂离子电池热失控后产生的气体成分几乎一致,均为H2、CO2、CO和碳氢化合物;磷酸铁锂与三元锂离子电池热失控后,电压均存在二次下降的现象.
Thermal runaway behavior of LiFePO4 and ternary Li-ion batteries under heating
In response to the risk of ignition and explosion of Li-ion batteries,the thermal runaway characteristics of Li-ion batteries with different cathode systems are studied using external heating abuse methods,taking 3.2 V 100 Ah LiFePO4 Li-ion battery and 3.6 V 90 Ah ternary LiNi0.5Co0.2Mn0.3O2(NCM523) Li-ion battery for energy storage as objects.The sampled LiFePO4 Li-ion battery does not burn under external heating condition,only releases a large amount of white smoke;the maximum temperature of the battery thermal runaway is 534.2 ℃,the total heat release is 0.162 MJ,and the maximum heat release rate is 1.81 kW.The sampled ternary Li-ion battery undergoes combustion and injection under external heating conditions;the maximum temperature of thermal runaway of the battery is 1052.4 ℃,the total heat release is 3.147 MJ,and the maximum heat release rate is 134.85 kW.The gas composition generated after thermal runaway of LiFePO4 and ternary Li-ion batteries is almost identical.They are H2,CO2,CO and hydrocarbon.Both LiFePO4 and ternary Li-ion batteries exhibit a secondary decrease in voltage after thermal runaway.
国家科技期刊平台
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