Amorphous Li2O2: Chemical Synthesis and Electrochemical Properties |
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| Authors: | Yelong Zhang Dr. Qinghua Cui Dr. Xinmin Zhang Dr. William C. McKee Prof. Ye Xu Shigang Ling Prof. Hong Li Dr. Guiming Zhong Prof. Yong Yang Prof. Zhangquan Peng |
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| Affiliation: | 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin, China;2. University of Chinese Academy of Science, Beijing, China;3. Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, USA;4. Institute of Physics, Chinese Academy of Sciences, Beijing, China;5. State Key Lab of Physical Chemistry of Solid Surfaces and College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, China |
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| Abstract: | When aprotic Li–O2 batteries discharge, the product phase formed in the cathode often contains two different morphologies, that is, crystalline and amorphous Li2O2. The morphology of Li2O2 impacts strongly on the electrochemical performance of Li–O2 cells in terms of energy efficiency and rate capability. Crystalline Li2O2 is readily available and its properties have been studied in depth for Li–O2 batteries. However, little is known about the amorphous Li2O2 because of its rarity in high purity. Herein, amorphous Li2O2 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 Li2O2 demonstrates enhanced charge‐transport properties and increased electro‐oxidation kinetics, manifesting itself a desirable discharge phase for high‐performance Li–O2 batteries. |
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| Keywords: | amorphous Li2O2 aprotic Li– O2 batteries charge-transport properties oxidation kinetics |
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