中国物理B ›› 2015, Vol. 24 ›› Issue (8): 88102-088102.doi: 10.1088/1674-1056/24/8/088102

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

A superhigh discharge capacity induced by a synergetic effect between high-surface-area carbons and a carbon paper current collector in a lithium–oxygen battery

罗广生a b, 黄诗婷a b, 赵宁a b, 崔忠慧a, 郭向欣a   

  1. a State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2015-01-27 修回日期:2015-02-13 出版日期:2015-08-05 发布日期:2015-08-05
  • 基金资助:

    Project supported by the Natural Science Foundation of the Chinese Academy of Sciences (Grant No. KGZD-EW-202-2), the National Key Basic Research Program of China (Grant No. 2014CB921004), and the National Natural Science Foundation of China (Grant No. U1232111).

A superhigh discharge capacity induced by a synergetic effect between high-surface-area carbons and a carbon paper current collector in a lithium–oxygen battery

Luo Guang-Sheng (罗广生)a b, Huang Shi-Ting (黄诗婷)a b, Zhao Ning (赵宁)a b, Cui Zhong-Hui (崔忠慧)a, Guo Xiang-Xin (郭向欣)a   

  1. a State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-01-27 Revised:2015-02-13 Online:2015-08-05 Published:2015-08-05
  • Contact: Guo Xiang-Xin E-mail:XXGuo@mail.sic.ac.cn
  • Supported by:

    Project supported by the Natural Science Foundation of the Chinese Academy of Sciences (Grant No. KGZD-EW-202-2), the National Key Basic Research Program of China (Grant No. 2014CB921004), and the National Natural Science Foundation of China (Grant No. U1232111).

摘要:

This paper invesitages the synergetic effect between high-surface-area carbons, such as Ketjan Black (KB) or Super P (SP) carbon materials, and low-surface-area carbon paper (CP) current collectors and it also examines their influence on the discharge performance of nonaqueous Li–O2 cells. Ultra-large specific discharge capacities are found in the KB/CP cathodes, which are much greater than those observed in the individual KB or CP cathodes. Detailed analysis indicates that such unexpectedly large capacities result from the synergetic effect between the two components. During the initial discharges of KB or SP materials, a large number of superoxide radical (O2·-) species in the electrolytes and Li2O2 nuclei at the CP surfaces are formed, which activate the CP current collectors to contribute considerable capacities. These results imply that CP could be a superior material for current collectors in terms of its contribution to the overall discharge capacity. On the other hand, we should be careful to calculate the specific capacities of the oxygen cathodes when using CP as a current collector; i.e., ignoring the contribution from the CP may cause overstated discharge capacities.

关键词: lithium–, oxygen batteries, high discharge capacity, carbon paper current collectors, large-surface carbon-based cathodes, synergetic effect

Abstract:

This paper invesitages the synergetic effect between high-surface-area carbons, such as Ketjan Black (KB) or Super P (SP) carbon materials, and low-surface-area carbon paper (CP) current collectors and it also examines their influence on the discharge performance of nonaqueous Li–O2 cells. Ultra-large specific discharge capacities are found in the KB/CP cathodes, which are much greater than those observed in the individual KB or CP cathodes. Detailed analysis indicates that such unexpectedly large capacities result from the synergetic effect between the two components. During the initial discharges of KB or SP materials, a large number of superoxide radical (O2·-) species in the electrolytes and Li2O2 nuclei at the CP surfaces are formed, which activate the CP current collectors to contribute considerable capacities. These results imply that CP could be a superior material for current collectors in terms of its contribution to the overall discharge capacity. On the other hand, we should be careful to calculate the specific capacities of the oxygen cathodes when using CP as a current collector; i.e., ignoring the contribution from the CP may cause overstated discharge capacities.

Key words: lithium–, oxygen batteries, high discharge capacity, carbon paper current collectors, large-surface carbon-based cathodes, synergetic effect

中图分类号:  (Carbon/carbon-based materials)

  • 81.05.U-
81.05.-t (Specific materials: fabrication, treatment, testing, and analysis) 88.80.ff (Batteries)