无定形固体
电化学
材料科学
相(物质)
化学工程
阴极
四甲基铵
电极
化学
结晶学
物理化学
有机化学
离子
工程类
作者
Yelong Zhang,Qinghua Cui,Xinmin Zhang,William C. McKee,Ye Xu,Shi-Gang Ling,Hong Li,Guiming Zhong,Yong Yang,Zhangquan Peng
标识
DOI:10.1002/ange.201605228
摘要
Abstract When aprotic Li–O 2 batteries discharge, the product phase formed in the cathode often contains two different morphologies, that is, crystalline and amorphous Li 2 O 2 . The morphology of Li 2 O 2 impacts strongly on the electrochemical performance of Li–O 2 cells in terms of energy efficiency and rate capability. Crystalline Li 2 O 2 is readily available and its properties have been studied in depth for Li–O 2 batteries. However, little is known about the amorphous Li 2 O 2 because of its rarity in high purity. Herein, amorphous Li 2 O 2 has been synthesized by a rapid reaction of tetramethylammonium superoxide and LiClO 4 in solution, and its amorphous nature has been confirmed by a range of techniques. Compared with its crystalline siblings, amorphous Li 2 O 2 demonstrates enhanced charge‐transport properties and increased electro‐oxidation kinetics, manifesting itself a desirable discharge phase for high‐performance Li–O 2 batteries.
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