Recyclable cobalt-molybdenum bimetallic carbide modified separator boosts the polysulfide adsorption-catalysis of lithium sulfur battery

鈷-鉬雙金屬碳化物修飾隔膜強化鋰硫電池中多 硫化鋰的吸附和催化轉化

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Ze Zhang
  • Jia-Nan Wang
  • A.-Hu Shao
  • Dong-Gen Xiong
  • Jian-Wei Liu
  • Cheng-Yen Lao
  • Kai Xi
  • Qiu Jiang
  • Ji Yu
  • Huang-Long Li
  • Zhen-Yu Yang
  • R. Vasant Kumar

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)2443-2455
Number of pages13
Journal / PublicationScience China Materials
Volume63
Issue number12
Online published18 Aug 2020
Publication statusPublished - Dec 2020

Abstract

The polysulfide shuttling and sluggish redox kinetics, due to the notorious adsorption-catalysis underperformance, are the ultimate obstacles of the practical application of lithium-sulfur (Li-S) batteries. Conventional carbon-based and transition metal compound-based material solutions generally suffer from poor catalysis and adsorption, respectively, despite the performance gain in terms of the other. Herein, we have enhanced polysulfide adsorption-catalytic capability and protected the Li anode using a complementary bimetallic carbide electrocatalyst, Co3Mo3C, modified commercial separator. With this demonstration, the potentials of bimetal compounds, which have been well recognized in other environmental catalysis, are also extended to Li-S batteries. Coupled with this modified separator, a simple cathode (S/Super P composite) can deliver high sulfur utilization, high rate performance, and excellent cycle stability with a low capacity decay rate of ∼0.034% per cycle at 1 C up to 1000 cycles. Even at a high S-loading of 8.0 mg cm−2 with electrolyte/sulfur ratio=6 mL g−1, the cathode still exhibits high areal capacity of ∼6.8 mA h cm−2. The experimental analysis and the first principles calculations proved that the bimetallic carbide Co3Mo3C provides more binding sites for adsorbing polysulfides and catalyzing the multiphase conversion of sulfur/polysulfide/sulfide than monometallic carbide Mo2C. Moreover, the modified separator can be reutilized with comparable electrochemical performance. We also showed other bimetallic carbides with similar catalytic effects on Li S batteries and this material family has great promise in different energy electrocatalytic systems.
本文報導了一種鈷-鉬雙金屬碳化物(Co3Mo3C)催化材料用 於修飾鋰硫電池隔膜, 強化多硫化鋰的化學吸附和催化轉化. 所組 裝的電池表現出優異的電化學性能, 即使在8.0 mg cm−2 的硫面積 負載量條件下, 面積比容量仍高達6.8 mA h cm−2. 理論計算結果表 明, 相比于單一金屬碳化物Mo2C, 雙金屬碳化物Co3Mo3C具有更多的活性位點, 更利於化學固定多硫化鋰, 並催化多硫化鋰間相互轉 化; 同時, Ni3Mo3C和Fe3Mo3C亦表現出類似的高催化活性. 本研究 對高性能鋰硫電池關鍵催化材料的設計具有一定的指導意義.

Research Area(s)

  • bimetallic carbides, electrocatalysts, lithium-sulfur batteries, modified separators, polysulfide adsorption-catalysis

Citation Format(s)

Recyclable cobalt-molybdenum bimetallic carbide modified separator boosts the polysulfide adsorption-catalysis of lithium sulfur battery. / Zhang, Ze; Wang, Jia-Nan; Shao, A.-Hu; Xiong, Dong-Gen; Liu, Jian-Wei; Lao, Cheng-Yen; Xi, Kai; Lu, Shi-Yao; Jiang, Qiu; Yu, Ji; Li, Huang-Long; Yang, Zhen-Yu; Kumar, R. Vasant.

In: Science China Materials, Vol. 63, No. 12, 12.2020, p. 2443-2455.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review