能源化学(英文版) ›› 2019, Vol. 39 ›› Issue (12): 54-60.

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P-doped BN nanosheets decorated graphene as the functional interlayer for Li-S batteries

Jing Zhanga, Wenzhe Mab, Zhenyu Fenga, Fangfang Wua, Denghu Weic, Baojuan Xia, Shenglin Xionga   

  1. a Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China;
    b Department of Science and Technology of Shandong Province, Jinan 250100, Shandong, China;
    c School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, Shandong, China
  • 收稿日期:2018-12-25 修回日期:2019-01-22 出版日期:2019-12-15 发布日期:2020-12-18
  • 通讯作者: Wenzhe Ma, mawenzhe2019@163.com; Shenglin Xiong, chexsl@sdu.edu.cn
  • 基金资助:
    The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (21871164), Young Scholars Program of Shandong University (No. 2017WLJH15), the China Postdoctoral Science Foundation (Nos. 2017M610419 and 2018T110680), the Special Fund for Postdoctoral Innovation Program of Shandong Province (No. 201701003), and the Taishan Scholar Project of Shandong Province (No. ts201511004).

P-doped BN nanosheets decorated graphene as the functional interlayer for Li-S batteries

Jing Zhanga, Wenzhe Mab, Zhenyu Fenga, Fangfang Wua, Denghu Weic, Baojuan Xia, Shenglin Xionga   

  1. a Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China;
    b Department of Science and Technology of Shandong Province, Jinan 250100, Shandong, China;
    c School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, Shandong, China
  • Received:2018-12-25 Revised:2019-01-22 Online:2019-12-15 Published:2020-12-18
  • Contact: Wenzhe Ma, mawenzhe2019@163.com; Shenglin Xiong, chexsl@sdu.edu.cn
  • Supported by:
    The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (21871164), Young Scholars Program of Shandong University (No. 2017WLJH15), the China Postdoctoral Science Foundation (Nos. 2017M610419 and 2018T110680), the Special Fund for Postdoctoral Innovation Program of Shandong Province (No. 201701003), and the Taishan Scholar Project of Shandong Province (No. ts201511004).

摘要: Lithium-sulfur (Li-S) batteries have attracted much attention due to their ultrahigh theoretical specific capacity. However, serious capacity attenuation caused by shuttle effect still inhibits the performance improvement. Herein, a modified separator consists of the few-layer graphene as a highly conductive network and stable scaffold to support P-doped boron nitride (denoted as BN-P@GO) as the functional interlayer of Li-S batteries. The cell with the interlayer provides an initial discharge capacity as high as 1045.3 mAh g-1, and retains a high reversible capacity of 728.7 mAh g-1 at 1 C after 500 cycles with a capacity decay of 0.061% per cycle. Moreover, the rate capability is also superior to cells with BN@GO or BN-P interlayers, i.e. reversible capcity of 457.9 mAh g-1 even at 3 C. The excellent electrochemical performance is ascribed to the synergistic effect of physical barrier and chemical adsorption for dissolved polysulfides provided by the modified layer. Furhtermore, it also mitigates the polarization and promotes kinetic reactions of the cells. This work provides a concise and effective method for commercialization of lithium-sulfur batteries.

关键词: P-doped BN nanosheets, Graphene, Multifunctional interlayer, Lithium-sulfur batteries

Abstract: Lithium-sulfur (Li-S) batteries have attracted much attention due to their ultrahigh theoretical specific capacity. However, serious capacity attenuation caused by shuttle effect still inhibits the performance improvement. Herein, a modified separator consists of the few-layer graphene as a highly conductive network and stable scaffold to support P-doped boron nitride (denoted as BN-P@GO) as the functional interlayer of Li-S batteries. The cell with the interlayer provides an initial discharge capacity as high as 1045.3 mAh g-1, and retains a high reversible capacity of 728.7 mAh g-1 at 1 C after 500 cycles with a capacity decay of 0.061% per cycle. Moreover, the rate capability is also superior to cells with BN@GO or BN-P interlayers, i.e. reversible capcity of 457.9 mAh g-1 even at 3 C. The excellent electrochemical performance is ascribed to the synergistic effect of physical barrier and chemical adsorption for dissolved polysulfides provided by the modified layer. Furhtermore, it also mitigates the polarization and promotes kinetic reactions of the cells. This work provides a concise and effective method for commercialization of lithium-sulfur batteries.

Key words: P-doped BN nanosheets, Graphene, Multifunctional interlayer, Lithium-sulfur batteries