| 2,4-二氟联苯用作高电压锂离子电池防过充剂 |
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| 引用本文： | 黄东海,刘蕊,范伟贞,余乐.2,4-二氟联苯用作高电压锂离子电池防过充剂[J].电池,2017,47(4). |
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| 作者姓名： | 黄东海 刘蕊 范伟贞 余乐 |
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| 作者单位： | 广州天赐高新材料股份有限公司,广东广州,510760 |
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| 基金项目： | 广东省应用型科技研发专项项目 |
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| 摘 要： | 通过线性扫描伏安(LSV)和交流阻抗谱研究2,4-二氟联苯(DFBP)用作电解液防过充添加剂的电化学行为。DFBP在过充至4.6~4.8 V时发生氧化电聚合,形成的含氟聚合物膜具有高阻抗特性,能在过充时减小充入的电流,提升电池的过充安全性能。DFBP比联苯(BP)的氧化电位高0.2 V,对4.35 V高电压电池室温循环的负面影响不明显。
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| 关 键 词： | 2 4-二氟联苯(DFBP) 电解液 防过充剂 高电压 锂离子电池 |
2,4-difluorobiphenyls as overcharge protection additive of high-voltage Li-ion battery |
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| HUANG Dong-hai,LIU Rui,FAN Wei-zhen,YU Le.2,4-difluorobiphenyls as overcharge protection additive of high-voltage Li-ion battery[J].Battery Bimonthly,2017,47(4). |
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| Authors: | HUANG Dong-hai LIU Rui FAN Wei-zhen YU Le |
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| Abstract: | The electrochemical behavior of 2,4-difluorobiphenyl (DFBP) used as electrolyte overcharge protection additive was investigated by linear sweep voltammetry (LSV),AC impedance spectroscopy analysis.The oxidative polymerization potential of DFBP occurred when overcharged to 4.6-4.8 V,a high impedance fluoropolymer film was formed,which could reduce the charging current while overcharge and improve the overcharge safety performance of the battery.The oxidation potential of DFBP was 0.2 V higher than that of biphenyl,indicating that DFBP had small negative effect on the cycle performance for the battery operated under 4.35 V at room temperature. |
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| Keywords: | 2 4-difluorobiphenyls(DFBP) electrolyte overcharge protection high-voltage Li-ion battery |
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