Effect of binder polymer structures used in composite cathodes on interfacial charge transfer processes in lithium polymer batteries
Effect of binder polymer structures used in composite cathodes on interfacial charge transfer processes in lithium polymer batteries
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DOI：
10.1016/j.electacta.2003.12.065
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发表时间：
2004-11
影响因子：
6.6
通讯作者：
S. Seki;S. Tabata;S. Matsui;M. Watanabe
中科院分区：
文献类型：
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作者：
S. Seki;S. Tabata;S. Matsui;M. Watanabe
研究了复合正极用粘结剂聚合物结构对锂聚合物电池(LPB)界面电荷转移过程的影响。以环氧乙烷(EO)、2-(2-甲氧基乙氧基)乙基缩水甘油醚(MEEGE)和烯丙基缩水甘油醚(AGE)为交联剂，制备了聚合物固体电解质(SPE)。由不同组成的EO和MEEGE组成的粘结剂梳状共聚物制备了LiCoO2复合阴极。用电化学方法研究了固相电极的离子导电性、固相电极与金属锂、复合阴极在不同正极电位下的界面电荷转移过程。随着粘结剂共聚物中MEEGE含量的增加，SPE与复合阴极之间的界面电阻略有降低。结果表明，随着MEEGE组成的增加，LPB的放电容量也有所提高。在复合阴极的粘结剂聚合物中引入支化侧链可以促进界面电荷的传输过程，同时也被发现在提高SPE的离子导电性方面非常有效。
The effect of binder polymer structures used in composite cathodes on the interfacial charge transfer processes in lithium polymer batteries (LPB) has been studied in detail. A cross-linked comb-copolymer, consisting of ethylene oxide (EO), 2-(2-methoxyethoxy)ethyl glycidyl ether (MEEGE), and allyl glycidyl ether (AGE), was used as a solid polymer electrolyte (SPE). LiCoO2composite cathodes were fabricated using binder comb-copolymers, consisting of EO and MEEGE with different compositions. Ionic conductivity of the SPE, and the interfacial charge transfer processes between the SPE and metallic lithium and between the SPE and the composite cathode at several cathode potentials versus Li/Li+, were electrochemically explored. With increasing MEEGE composition in the binder copolymers, the interfacial resistances between the SPE and the composite cathode appreciably decreased. As the result, discharge capacity of the LPB also enhanced with increasing the MEEGE composition. The introduction of the branched-side-chains to the polymer backbone to the binder polymers for the composite cathodes caused to facilitate the interfacial charge transport processes, while the introduction had also been found to be very effective in terms of the enhancement of ionic conductivity of SPE.