摘要
为研究磷酸铁锂(LiFePO_(4))/石墨电芯在失控过程中的产气情况,采用气相色谱(GC)与介质阻挡放电等离子体检测器(BID)分析电芯产生的气体成分。气体主要来源于电解液溶剂的分解,正常充放电电芯产气以H_(2)、CO和C_(2)H_(4)为主。电芯在循环后,除产生少量氧化性气体C_(2)H_(2)外,其他气体成分和含量与循环前差异不大。循环前后的电芯经45℃高温存储、过充电、130℃/150℃热箱和短路等失控测试后,均会产生大量CO_(2),并伴随有机烃类和无机气体含量的变化。45℃下随存储时间延长,会产生更高含量的H_(2)与CH_(4)。对比循环前,电芯循环后在过充电时会产生更多的CH_(4)、C_(2)H_(6)和C_(3)H_(8);130℃热箱实验中,H_(2)含量降低,C_(2)H_(6)、CH_(4)和CO含量升高,150℃热箱趋势基本与130℃热箱一致,仅CO含量变化较小;短路实验中,C_(2)H_(6)、C_(3)H_(6)和CH_(4)含量升高。
In order to study the gas production of lithium iron phosphate(LiFePO_(4))/graphite cell during runaway process,gas chromatography(GC)and dielectric barrier discharge plasma detector(BID)were used to analyze the components of the gas produced by the cell.The gas mainly came from solvent decomposition of electrolyte.The mainly gases were H_(2),CO and C_(2)H_(4) in the normal charge/discharge process.In addition to a small amount of oxidizing gas C_(2)H_(2) produced by cell after cycle,the composition and proportion of other gases were not significantly different from those before cycle.The content of CO_(2) all increased,meanwhile the content of organic hydrocarbon gas and inorganic gas also changed after the runaway test of cell,such as 45℃high temperature storage,overcharging,130℃/150℃hot box and short circuit.With the extension of storage time,a higher content of H_(2) and CH_(4) was produced under 45℃.Compared with the cell before cycle,the cell after cycle produced more CH_(4),C_(2)H_(6) and C_(3)H_(80 during overcharging.In the 130℃hot box experiment,the H_(2) content decreased,while the content of C_(2)H_(6),CH_(4) and CO increased.The trend of the 150℃hot box experiment was basically consistent with that of the 130℃hot box,only the CO content changed little.The content of C_(2)H_(6),C_(3)H_(6) and CH_(4) increased in short circuit experiment.
作者
汪涛
张海林
杨海超
WANG Tao;ZHANG Hai-lin;YANG Hai-chao(Shanghai Electric Gotion New Energy Technology Co.,Ltd.,Shanghai 200041,China)
出处
《电池》
CAS
北大核心
2022年第5期543-546,共4页
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