Molecular Sieve Induced Solution Growth of Li2O2 in the Li-O2 Battery with Largely Enhanced Discharge Capacity

Wei Yu, Huwei Wang, Jing Hu, Wei Yang, Lei Qin, Ruliang Liu, Baohua Li, Dengyun Zhai, Feiyu Kang

研究成果: Article査読

12 被引用数 (Scopus)

抄録

The formation of the insulated film-like discharge products (Li2O2) on the surface of the carbon cathode gradually hinders the oxygen reduction reaction (ORR) process, which usually leads to the premature death of the Li-O2 battery. In this work, by introducing the molecular sieve powder into the ether electrolyte, the Li-O2 battery exhibits a largely improved discharge capacity (63 times) compared with the one in the absence of this inorganic oxide additive. Meanwhile, XRD and SEM results qualitatively demonstrate the generation of the toroid Li2O2 as the dominated discharge products, and the chemical titration quantifies a higher yield of the Li2O2 with the presence of the molecular sieve additive. The addition of the molecular sieve controls the amount of the free water in the electrolyte, which distinguishes the effect of the molecular sieve and the free water on the discharge process. Hence, a possible mechanism has been proposed that the adsorption of the molecular sieves toward the soluble lithium superoxides improves the disproportionation of the lithium superoxides and consequently enhances the solution-growth of the lithium peroxides in the low donor number ether electrolyte. In general, the application of the molecular sieve triggers further studies concerning the improvement of the discharge performance in the Li-O2 battery by adding the inorganic additives.

本文言語English
ページ(範囲)7989-7995
ページ数7
ジャーナルACS Applied Materials and Interfaces
10
9
DOI
出版ステータスPublished - 2018 3 7
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)

フィンガープリント

「Molecular Sieve Induced Solution Growth of Li<sub>2</sub>O<sub>2</sub> in the Li-O<sub>2</sub> Battery with Largely Enhanced Discharge Capacity」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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