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Amorphous Li 2 O 2 : Chemical Synthesis and Electrochemical Properties
Author(s) -
Zhang Yelong,
Cui Qinghua,
Zhang Xinmin,
McKee William C.,
Xu Ye,
Ling Shigang,
Li Hong,
Zhong Guiming,
Yang Yong,
Peng Zhangquan
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201605228
Subject(s) - amorphous solid , electrochemistry , materials science , chemical engineering , cathode , phase (matter) , electrode , chemistry , organic chemistry , engineering
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.