Investigation on the Carbonyl Redox of Polyimide Based on Bridged Dianhydride as Electrode in Lithium-Ion Battery
作者:Yuhua Sun、Bing Li、Shiyou Guan
DOI:10.1149/1945-7111/ab9ccd
日期:——
In lithium-ion batteries, carbonyl redox of polyimides based on bridged dianhydride as electrodes exhibit a low electrochemical activity. In order to explain this phenomenon, we selected three previously reported bridged dianhydride including BTDA, BPDA and ODPA combined with p-PDA to form polyimides noted as PI-1, PI-2 and PI-3, respectively as electrode materials, and polyimide PI-4 composed of NTCDA
在锂离子电池中,基于桥接二酐作为电极的聚酰亚胺的羰基氧化还原表现出较低的电化学活性。为了解释这种现象,我们选择了三种先前报道的桥联二酐,包括BTDA,BPDA和ODPA与p-PDA结合形成分别称为PI-1,PI-2和PI-3的聚酰亚胺作为电极材料,以及聚酰亚胺PI由NTCDA和p-PDA组成的-4作为对比。在1 M LiPF 6混合碳酸盐电解质中,在1.2至3 V vs Li + / Li的条件下,进行了恒静充放电测试,结果表明PI-1,PI-2和PI-3极化严重,可逆性差。电极的电化学阻抗谱(EIS)表明,极化主要是由于PI-1,PI-2和PI-3的锂离子扩散系数比PI-4小得多。