LAUSR

Aluminum-ion batteries (AIBs) are a type of promising energy storage device due to their high capacity, high charge transfer efficiency, low cost, and high safety. However, the most investigated graphitic and metal dichalcogenide cathodes normally possess only a moderate capacity and a relatively low cycling stability, respectively, which limit the further development of high-performance AIBs. Here, based on the results of first principles calculations, we developed a polyaniline/graphene oxide composite that exhibited outstanding performances as a cathode material in AIBs (delivering 180 mA h g − after 4000 cycles), considering both the discharge capacity and the cycling performance. Ex-situ characterizations verified that the charge storage mechanism of polyaniline depended on the moderate interactions between −NH in the polyaniline chain and the electrolyte anions, such as AlCl 4− . These findings lay the foundation of the development of high-performance AIBs based on conducting polymers. 铝离子电池作为一种高容量、 高电荷转移率、 低成本和高安全性的储能器件具有良好的应用前景. 但是, 阴极材料的电化学性能限制了铝离子电池的进一步发展, 例如目前研究最多的石墨类电极材料容量较低, 而过渡金属氧族化合物电极材料的循环稳定性相对较差. 本论文根据第一性原理的计算结果, 开发出一种聚苯胺/氧化石墨烯复合材料, 该复合材料作为铝离子电池阴极材料表现出极为出色的电化学性能(4000次循环后比容量依然能维持 180 mA h g −1 ). 多种非原位表征实验证明, 在充电过程中聚苯胺通过其–NH基团与电解质阴离子(如AlCl 4 − )之间的适度相互作用进行电荷存储. 本研究为基于导电聚合物正极材料的高性能铝离子电池的发展奠定了基础.