物理化学学报 >> 2016, Vol. 32 >> Issue (1): 343-348.doi: 10.3866/PKU.WHXB201510133

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12-冠-4对非质子Li-O2电池氧电极的影响

王晓晨,王英明,刘威,白若鹏,刘艳芳,肖丽*(),陆君涛,庄林   

  • 收稿日期:2015-08-12 发布日期:2016-01-13
  • 通讯作者: 肖丽 E-mail:chem.lily@whu.edu.cn
  • 基金资助:
    国家重点基础研究发展规划项目(973)(2012CB932800, 2012CB215500);国家自然科学基金(21125312, 21203142, 21573167);国家教育部博士点专项基金(20110141130002);中央高校基本科研业务费专项资金(2014203020207)

Influence of 12-Crown-4 on Oxygen Electrode of Aprotic Li-O2 Battery

Xiao-Chen WANG,Ying-Ming WANG,Wei LIU,Ruo-Peng BAI,Yan-Fang LIU,Li XIAO*(),Jun-Tao LU,Lin ZHUANG   

  • Received:2015-08-12 Published:2016-01-13
  • Contact: Li XIAO E-mail:chem.lily@whu.edu.cn
  • Supported by:
    the National Key Basic Research Program of China (973)(2012CB932800, 2012CB215500);National Natural ScienceFoundation of China(21125312, 21203142, 21573167);Doctoral Fund of Ministry of Education of China(20110141130002);FundamentalResearch Funds for the Central Universities, China(2014203020207)

摘要:

Li-O2电池放电产物Li2O2由于在有机溶剂中溶解度较差,会堵塞气体通道,这是Li-O2电池面临的一个主要挑战。在本工作中,我们选择12-冠-4做为添加剂捕获Li+,来研究其对氧电极放电产物溶解性的影响,并采用了多种电化学表征方法,包括循环伏安法和旋转圆盘电极等。结果显示,仅仅添加5%的12-冠-4就能明显提高氧还原产物$\text{O}_{2}^{-}$的稳定性,并减少固体Li2O2的生成。结合软硬酸碱和第一性原理计算对上述实验结果进行了解释。

关键词: Li-O2电池, 氧电极, 冠醚, 软硬酸碱理论

Abstract:

One of the major challenges with Li-O2 batteries is that the discharge product, Li2O2, blocks the gas pathway because of its poor solubility in aprotic solvents. In this work, 12-crown-4 ether was used as an additive to capture Li+, and its influence on the solubility of the discharge products of the oxygen electrode was investigated. Multiple electrochemical methods, including cyclic voltammetry and rotating-ring disk electrode, were used. The results show that the addition of only 5% of 12-crown-4 ether significantly improves the stability of the oxygen reduction product $\text{O}_{2}^{-}$, and decreases the formation of solid Li2O2. We used a combination of the hard-soft-acid-base theory and ab initio calculations to explain these observations.

Key words: Li-O2 battery, Oxygen electrode, Crown ether, Oxygen electrode, Hard-soft-acid-base theory

MSC2000: 

  • O646