Amorphous Li2 O2 : Chemical Synthesis and Electrochemical Properties

Authors

Yelong Zhang, State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, 130022, China.
Qinghua Cui, State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, 130022, China.
Xinmin Zhang, State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, 130022, China.
William C. McKee, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA.
Ye Xu, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA.
Shigang Ling, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Hong Li, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Guiming Zhong, State Key Lab of Physical Chemistry of Solid Surfaces and College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Yong Yang, State Key Lab of Physical Chemistry of Solid Surfaces and College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Zhangquan Peng, State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, 130022, China. zqpeng@ciac.ac.cn.

Document Type

Article

Publication Date

8-26-2016

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.

Publication Source (Journal or Book title)

Angewandte Chemie (International ed. in English)

First Page

10717

Last Page

21

Recommended Citation

Zhang, Y., Cui, Q., Zhang, X., McKee, W. C., Xu, Y., Ling, S., Li, H., Zhong, G., Yang, Y., & Peng, Z. (2016). Amorphous Li2 O2 : Chemical Synthesis and Electrochemical Properties. Angewandte Chemie (International ed. in English), 55 (36), 10717-21. https://doi.org/10.1002/anie.201605228