准固态锂离子电池正极材料柱[5]醌的研究

Pillar[5]quinone as cathode material for quasi-solid-state rechargeable lithium batteries

锂离子电池的有机正极材料由于具有比容量高、环境友好和廉价等优点,近年来成为研究的热点.但是,有机电极材料在液态电解液中的溶解流失易导致其容量迅速衰减,严重限制了它们的实际应用.本工作基于聚(甲基丙烯酸酯)/聚乙二醇的准固态电解质,考察了以柱[5]醌为正极的准固态锂二次电池的电化学性能.结果显示,柱[5]醌正极不仅保持了高容量的特性(首次放电容量410 mA h/g),并且循环寿命得到了有效提高.0.2 C下循环100周后,电极的容量保持率为88.5%,显示了柱[5]醌在高比能量准固态锂离子电池中的应用潜力.

Organic electrode compounds have been considered as potential cathode material for lithium ion batteries owing to their advantages including high capacity, low cost and resource renewability. However, the application of organic electrode materials is hindered by their severe solubility in liquid organic electrolyte. Herein, the quasi-solid-state lithium-ion batteries have been successfully constructed by using poly（methyl acrylate）/ poly（ethylene glycol） （PMA/PEG） quasi-solid electrolyte and pillar[5]quinone cathode material for the first time. As a result, the pillar[5]quinone material provided an initial discharge capacity of 410 mA h/g and a capacity retention of 88.5% after 100 cycles at 0.2 C, which shows the pillar[5] quinone potential applications for high energy quasi-solid-state lithium-ion batteries.