聚合物锂离子电池不同化成电压下产生气体的研究

电化学（中英文） ›› 2003, Vol. 9 ›› Issue (4): 387-392.

聚合物锂离子电池不同化成电压下产生气体的研究

黄丽,金明钢,蔡惠群,郑明森,董全峰,尤金跨,林祖赓

厦大宝龙电池研究所,厦大宝龙电池研究所,厦大宝龙电池研究所,厦大宝龙电池研究所,厦大宝龙电池研究所,厦大宝龙电池研究所,厦大宝龙电池研究所福建厦门361005 ,福建厦门361005 ,福建厦门361005 ,福建厦门361005 ,福建厦门361005 ,福建厦门361005 ,福建厦门361005

收稿日期:2003-11-28 修回日期:2003-11-28 出版日期:2003-11-28 发布日期:2003-11-28

Study on the Gas Generation in Different Charging Voltage during Formation Process in Polymer Lithium-ion Battery

HUANG Li, JIN Ming_gang, CAI Hui_qun, ZHENG Ming_sen, DONG Quan_feng, YOU Jin_kua, LIN Zu_geng*

(Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China)

Received:2003-11-28 Revised:2003-11-28 Published:2003-11-28 Online:2003-11-28

摘要/Abstract

摘要： 　应用气相色谱方法初步探讨了聚合物锂离子电池在首次充电过程中于不同化成电压下产生气体的原因和机理.结果表明,当电池电解液采用1mol/LLiPF6-EC～DMC～EMC(三者体积比1∶1∶1)时,于化成电压小于2.5V下,产生的气体主要为H2和CO2等;化成电压为2.5V时,电解液中的EC开始分解,电压在3.0～3.5V的范围内,由于EC的还原分解,产生的气体主要为C2H4;而当电压大于3.0V时,由于电解液中DMC和EMC的分解,除了产生C2H4气体外,CH4,C2H6等烷烃类气体也开始出现;电压高于3.8V后,DMC和EMC的还原分解成为主反应.此外,当化成电压处于3.0～3.5V之间,化成过程中产生的气体量最大;电压大于3.5V后,由于电池负极表面的SEI层已基本形成,因此,电解液溶剂的还原分解反应受抑制,产生的气体的数量也随之迅速下降.

关键词: 聚合物锂离子电池, 化成, 气体析出, SEI

Abstract: The gases of polymer lithium_ion battery(PLI) generated under different voltages during the first charging process were examined by means of gas chromatography (GC), and the mechanism of the gas generation was discussed. The electrolyte used in batteries was 1 mol/L LiPF6_EC～DMC～EMC=1∶1∶1(in volume). The results showed that when the charging voltage is less than 2.5 V, the main component of generated gases are H2 and CO2, and when the charging voltage is 2.5 V, EC begins to decompose. Due to the decomposition of EC, the main generated gas is C2H4 when the charge voltages between 3.0 V and 3.5 V. As the voltage is higher than 3.0 V, the generated gases composed of C2H4 as well as CH4 and C2H6.The later are caused by the decomposition of DMC and EMC. When the charging voltage is higher than 3.8V, the decomposition of DMC and EMC becomes dominant. Furthermore, when the voltages are between 3.0 V and 3.5 V, the volumes of generated gases are the most. Since the solid electrolyte interface (SEI) on the surface of carbon electrode has been formed, while the charging voltage higher than 3.5 V, the decomposition of the electrolyte slowed down and then restrained, and the volume of the generated gases decreased quickly.

中图分类号:

TM911

黄丽, 金明钢, 蔡惠群, 郑明森, 董全峰, 尤金跨, 林祖赓. 聚合物锂离子电池不同化成电压下产生气体的研究[J]. 电化学（中英文）, 2003, 9(4): 387-392.

HUANG Li, JIN Ming_gang, CAI Hui_qun, ZHENG Ming_sen, DONG Quan_feng, YOU Jin_kua, LIN Zu_geng . Study on the Gas Generation in Different Charging Voltage during Formation Process in Polymer Lithium-ion Battery[J]. Journal of Electrochemistry, 2003, 9(4): 387-392.

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