Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (1): 343-348.doi: 10.3866/PKU.WHXB201510133

• ARTICLE • Previous Articles     Next Articles

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)

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