Energy Storage Science and Technology ›› 2018, Vol. 7 ›› Issue (4): 667-673.doi: 10.12028/j.issn.2095-4239.2018.0069

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Achieving high performance lithium-O2 battery by introducing a novel urea electrolyte

REN Jing, HUANG Zhimei, SHEN Yue, HUANG Yunhui   

  1. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
  • Received:2018-04-28 Revised:2018-05-03 Online:2018-07-01 Published:2018-05-10

Abstract: The development of rechargeable Li-O2 battery (LOB) has encountered bottlenecks at this stage. One of the biggest challenges is to lower the oxidation potential of Li2O2, the insulating and insoluble discharge product. In this paper, 1, 3-Dimethyl-2-imidazolidinone (DMI) is first to be used as electrolyte in LOB, which can increase the solubility of lithium peroxide, promote its solvation, and improve the contact between Li2O2 and cathode, resulting in an improved battery performance. Compared to the traditional TEGDME electrolyte, DMI can increase the charge capacity by 1.5 times, while decrease the charge overpotential by 0.6 V, which suppress the side reaction caused by high potential. At the same time, by adding oxygen inhibitors, the oxygen radicals in the solvent are stabilized, the nucleophilic attack on the DMI by the discharge intermediate product is reduced, and the cycle performance of the battery is significantly improved.

Key words: lithium-O2 battery, electrolyte, lithium peroxide, cycle performance

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