能源化学(英文版)

能源化学(英文) ›› 2018, Vol. 27 ›› Issue (6): 1644-1650.DOI: 10.1016/j.jechem.2018.06.003

• Review • 上一篇    下一篇

Core-shell structured 1,4-benzoquinone@TiO2 cathode for lithium batteries

Aikai Yang, Xingchao Wang, Yong Lu, Licheng Miao, Wei Xie, Jun Chen   

  1. Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China
  • 收稿日期:2018-04-11 修回日期:2018-06-05 出版日期:2018-11-15 发布日期:2018-10-12
  • 通讯作者: Jun Chen
  • 基金资助:

    This work was supported by the National Programs for NanoKey Project (2017YFA0206700), the National Natural Science Foundation of China (51231003), and the Ministry of Education of China (B12015).

Core-shell structured 1,4-benzoquinone@TiO2 cathode for lithium batteries

Aikai Yang, Xingchao Wang, Yong Lu, Licheng Miao, Wei Xie, Jun Chen   

  1. Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2018-04-11 Revised:2018-06-05 Online:2018-11-15 Published:2018-10-12
  • Contact: Jun Chen
  • Supported by:

    This work was supported by the National Programs for NanoKey Project (2017YFA0206700), the National Natural Science Foundation of China (51231003), and the Ministry of Education of China (B12015).

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摘要： Organic carbonyl compounds are considered as promising candidates for lithium batteries due to their high capacity and environmental friendliness. However, they suffer from serious dissolution in the electrolyte, leading to fast capacity decay. Here we report core-shell structured 1,4-benzoquinone@titanium dioxide (BQ@TiO2) composite as cathode for lithium batteries. The composite cathode can deliver a high discharge capacity of 441.2 mA h/g at 50 mA/g and a high capacity retention of 80.7% after 100 cycles. The good cycling performance of BQ@TiO2 composite can be attributed to the suppressed dissolution of BQ, which results from the physical confinement effect of TiO2 shell and the strong interactions between BQ and TiO2. Moreover, the combination of ex situ infrared spectra and density functional theory calculations reveals that the active redox sites of BQ are carbonyl groups. This work provides an alternative way to mitigate the dissolution of small carbonyl compounds and thus enhance their cycling stability.

关键词: Lithium batteries, Organic cathode, Benzoquinone, Titanium dioxide, Core-shell structure, Density functional theory

Abstract: Organic carbonyl compounds are considered as promising candidates for lithium batteries due to their high capacity and environmental friendliness. However, they suffer from serious dissolution in the electrolyte, leading to fast capacity decay. Here we report core-shell structured 1,4-benzoquinone@titanium dioxide (BQ@TiO2) composite as cathode for lithium batteries. The composite cathode can deliver a high discharge capacity of 441.2 mA h/g at 50 mA/g and a high capacity retention of 80.7% after 100 cycles. The good cycling performance of BQ@TiO2 composite can be attributed to the suppressed dissolution of BQ, which results from the physical confinement effect of TiO2 shell and the strong interactions between BQ and TiO2. Moreover, the combination of ex situ infrared spectra and density functional theory calculations reveals that the active redox sites of BQ are carbonyl groups. This work provides an alternative way to mitigate the dissolution of small carbonyl compounds and thus enhance their cycling stability.

Key words: Lithium batteries, Organic cathode, Benzoquinone, Titanium dioxide, Core-shell structure, Density functional theory