位阻效应
水溶液
氧化还原
聚苯胺
电化学
分子
电解质
化学工程
化学
光化学
无机化学
电极
聚合物
有机化学
聚合
物理化学
工程类
作者
Guanzhong Ma,Zhengyu Ju,Xin Xu,Yunfei Xu,Yao Sun,Yaqun Wang,Guoxin Zhang,Mian Cai,Lijia Pan,Guihua Yu
出处
期刊:Chemical Science
[Royal Society of Chemistry]
日期:2023-01-01
卷期号:14 (44): 12589-12597
被引量:16
摘要
Polyaniline (PANI), with merits of high electronic conductivity and capacity, is a promising material for zinc (Zn)-ion batteries. However, its redox window in Zn batteries is often limited, mainly due to the oxidative degradation at high potentials-in which imine groups can be attacked by water molecules. Here, we introduce phytic acid, a kind of supermolecule acid radical ion, as a dopant and electrolyte additive. Various in/ex situ analyses and theoretical calculations prove that the steric hindrance effect can prevent electroactive sites from the attack by water molecules. Meanwhile, the redox reaction can be stabilized by an even distribution of electron cloud due to the conjugated structure of phenazine groups. Accordingly, the assembled Zn-PANI battery can allow stable and long-term charge-discharge reactions to occur at a potential as high as 2.0 V with a discharged plateau of 1.5 V, and it also shows high rate performance and stable long cycle life (75% capacity retention after 1000 cycles at 10 A g-1).
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