Amorphous Li2O2: Chemical Synthesis and Electrochemical Properties

详细信息    查看全文

• 作者：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 and Prof. Zhangquan Peng
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 26, 2016
• 年：2016
• 卷：55
• 期：36
• 页码：10717-10721
• 全文大小：1502K
• ISSN：1521-3773

文摘

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.