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

Authors

Li HUANG, Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China);
Ming-gang JIN, Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China);
Hui-qun CAI, Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China);
Ming-sen ZHENG, Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China);
Quan-feng DONG, Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China);
Jin-kua YOU, Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China);
Zu-geng LIN, Xiamen University Powerlong Battery Research Institue,Xiamen 361005, China);

Corresponding Author

Zu_geng LIN

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.

DOI Link

https://doi.org/10.61558/2993-074X.1522

Publication Date

2003-11-28

Online Available Date

2003-11-28

Revised Date

2003-11-28

Received Date

2003-11-28

Recommended Citation

Li HUANG, Ming-gang JIN, Hui-qun CAI, Ming-sen ZHENG, Quan-feng DONG, Jin-kua YOU, Zu-geng LIN. 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.
DOI: 10.61558/2993-074X.1522
Available at: https://jelectrochem.xmu.edu.cn/journal/vol9/iss4/2

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