LiCoO₂-catalyzed electrochemical oxidation of Li₂CO₃

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• 作者：Lijuan Fan ; Daichun Tang ; Deyu Wang ; Zhaoxiang Wang ; Liquan Chen
• 关键词：spinel LiCoO2 ; catalyst ; Li2CO3 ; electrochemical oxidation ; battery
• 刊名：Nano Research
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：9
• 期：12
• 页码：3903-3913
• 全文大小：1,748 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000
• 卷排序：9

文摘

Lithium carbonate (Li₂CO₃) is very common in various types of lithium (Li) batteries. As an insulating by-product of the oxygen reduction reaction on the cathode of a Li–air battery, it cannot be decomposed below 4.75 V (vs. Li+/Li) during recharge and leads to a large polarization, low coulombic efficiency, and low energy conversion efficiency of the battery. On the other hand, more than 10% of the Li ions from the cathode material are consumed during chemical formation of a Li-ion battery, resulting in low coulombic efficiency and/or energy density. Consequently, lithium compensation becomes essential to realize Li-ion batteries with a higher energy density and longer cycle life. Therefore, reducing the oxidation potential of Li₂CO₃ is significantly important. To address these issues, we show that the addition of nanoscaled LiCoO₂ can effectively lower this potential to 4.25 V. On the basis of physical characterization and electrochemical evaluation, we propose the oxidization mechanism of Li₂CO₃. These findings will help to decrease the polarization of Li–air batteries and provide an effective strategy for efficient Li compensation for Li-ion batteries, which can significantly improve their energy density and increase their energy conversion efficiency and cycle life.