阴极
材料科学
聚吡咯
电化学
溶解
化学工程
涂层
电导率
复合数
功率密度
电池(电)
多孔性
电极
无机化学
复合材料
聚合物
化学
功率(物理)
物理
物理化学
工程类
量子力学
聚合
作者
Kexing Cai,Shaohua Luo,Lixiong Qian,Xue Meng,Shengxue Yan,Jing Guo,Qing Wang,Xianbing Ji,Zhou Xiuyan
标识
DOI:10.1016/j.jpowsour.2023.232854
摘要
Mn-based materials are among the most promising Zn-ion batteries (ZIBs) cathode materials. However, their inherently poor conductivity and structure collapse hinder their practical application. Herein, Mn2O3@polypyrrole (PPy) porous spheres are prepared using a hydrothermal method. Coating Mn2O3 with PPy, a conductive polymer, improves its conductivity and inhibits Mn dissolution during electrochemical reactions. The Mn2O3@PPy cathode exhibits remarkable electrochemical performance and an excellent specific capacity of 287.7 mAh·g−1 after 300 cycles at 0.1 A g−1. The cathode maintains a specific capacity of 73.5 mAh·g−1 after 3000 cycles at 3.0 A g−1 and exhibits an excellent cycle life. In addition, the co-insertion/extraction of H+ and Zn2+ and formation/dissolution mechanism of zinc sulfide hydrate of the Mn2O3@PPy electrode are evaluated theoretically using several methods. The energy density of the cathode at the power density of 98.7 W kg−1 is 602.8 Wh·kg−1, which is higher than those of numerous previously reported advanced ZIBs cathodes.
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