结晶度
阳极
材料科学
电化学
化学工程
电池(电)
氧气
纳米技术
空位缺陷
电极
化学
复合材料
热力学
结晶学
物理化学
功率(物理)
工程类
有机化学
物理
作者
Yanting Ma,Yangyang Bai,Yan Tang,Shizheng Zheng,Cuiqing Zhang,Changyuan Hu,Kejie Dai,Jing Zhao,Qian Ding,Rongbin Zhang
标识
DOI:10.1002/batt.202300067
摘要
Abstract Bi 2 O 3 is a theoretically high capacitive anode material; however, its low conductivity and deficient surface‐active sites lead to reduced practical capability compared to the theoretical one. Herein, a facile and environmentally benign strategy is developed to simultaneously tailor the morphology and create oxygen vacancies in Bi 2 O 3 by adding trace water in a solvothermal procedure. Here trace water serves as an intermediary agent to change the growth mechanism of Bi 2 O 3 and form a hierarchical structure with increased crystallinity. Electrochemical experiments reveal that the optimal tremella‐shaped Bi 2 O 3 delivers a higher specific capacity, approximately reaching 65 % of the theoretical one. Such satisfactory electrochemical performance is due to the regulated tremella shape and the created oxygen vacancies, which can expose more electrochemical active‐sites and promote ion diffusion. Moreover, the massive oxygen vacancies and increased crystallinity are also beneficial for electron transfer, thus enhancing the capacity. Eventually, a Bi 2 O 3 ‐6//AC asymmetric device is constructed and a superior energy density (40.8 Wh kg −1 ) is realized than the others Bi 2 O 3 ‐based peers. This study paves a facile way for exploring advanced Bi 2 O 3 ‐based alkaline battery anode materials through an environmentally benign method.
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