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Angew Chem Int Ed Engl. 2016 Aug 26;55(36):10717-21. doi: 10.1002/anie.201605228. Epub 2016 Aug 3.

Amorphous Li2 O2 : Chemical Synthesis and Electrochemical Properties.

Author information

1
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, 130022, China.
2
University of Chinese Academy of Science, Beijing, 100049, China.
3
Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA.
4
Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
5
State Key Lab of Physical Chemistry of Solid Surfaces and College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, 361005, China.
6
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, 130022, China. zqpeng@ciac.ac.cn.

Abstract

When aprotic Li-O2 batteries discharge, the product phase formed in the cathode often contains two different morphologies, that is, crystalline and amorphous Li2 O2 . The morphology of Li2 O2 impacts strongly on the electrochemical performance of Li-O2 cells in terms of energy efficiency and rate capability. Crystalline Li2 O2 is readily available and its properties have been studied in depth for Li-O2 batteries. However, little is known about the amorphous Li2 O2 because of its rarity in high purity. Herein, amorphous Li2 O2 has been synthesized by a rapid reaction of tetramethylammonium superoxide and LiClO4 in solution, and its amorphous nature has been confirmed by a range of techniques. Compared with its crystalline siblings, amorphous Li2 O2 demonstrates enhanced charge-transport properties and increased electro-oxidation kinetics, manifesting itself a desirable discharge phase for high-performance Li-O2 batteries.

KEYWORDS:

amorphous Li2O2; aprotic Li-O2 batteries; charge-transport properties; oxidation kinetics

PMID:
27486085
DOI:
10.1002/anie.201605228

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