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首页> 外文期刊>RSC Advances >Physical and chemical dual-confinement of polysulfides within hierarchically meso-microporous nitrogen-doped carbon nanocages for advanced Li-S batteries
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Physical and chemical dual-confinement of polysulfides within hierarchically meso-microporous nitrogen-doped carbon nanocages for advanced Li-S batteries

机译：高级微孔氮掺杂碳纳米纳米多硫化物的物理和化学双限制，用于高级LI-S电池

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摘要

Lithium-sulfur (Li-S) batteries with high theoretical specific energy (1675 mA h g(-1)), environmental benignity and low cost are considered to be some of the most promising next-generation energy-storage systems compared with conventional lithium-ion batteries. However intrinsic large volume expansion and irreversible loss of activated materials seriously limit their commercial applications. To solve the problems, nitrogen-doped hierarchical carbon nanocages were synthesized and used as efficient sulfur hosts. The synthesized nitrogen doped hierarchically meso-microporous carbon (N-MMC) had large BET surface area and mesopore volumes, contributing to high sulfur loading and a reduced volume-change effect of sulfur during lithiation. Moreover, the strong physical adsorption in the micropores together with improved chemical adsorption caused by nitrogen doping lead to effective polysulfide trapping. The N-MMC/S exhibited high initial capacities of 1202.2 mA h g(-1) at 0.2C and 1024 mA h g(-1) at 0.5C. The capacity kept at as high as 780 mA h g(-1) after 60 cycles at 0.2C and 623.8 mA h g(-1) after 70 cycles at 0.5C.
机译：具有高理论特异性能量的锂 - 硫（LI-S）电池（1675 mA Hg（-1）），环境良性和低成本被认为是与传统锂相比的最有前途的下一代储能系统离子电池。然而，固有的大容量膨胀和不可逆转的活性材料损失严重限制了他们的商业应用。为了解决问题，合成氮掺杂的等级碳纳米物并用作效率的硫宿主。合成的氮掺杂分层中型 - 微孔 - 微孔碳（N-MMC）具有大的BET表面积和中孔体积，有助于高硫载荷和锂期间硫的减小的体积变化效果。此外，微孔中的强烈物理吸附以及由氮掺杂引起的改善的化学吸附导致有效的多硫化物捕获。 N-MMC / S在0.2℃和1024mA Hg（-1）下在0.5℃下表现出1202.2mA H（-1）的高初始容量。在0.2℃和623.8 mA H G（-1）下在0.5℃下的70℃下保持高达780mA H（-1）的容量保持在0.2℃和623.8mA Hg（-1）。

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  • 来源
    《RSC Advances》 |2017年第68期|共7页
  • 作者

    Wu Pan; Sun Ming-Hui; Yu Yong; Peng Zhao; Bulbula Shimeles T.; Li Yu; Chen Li-Hua; Su Bao-Lian;

  • 作者单位

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Wuhan Univ Technol Lab Living Mat State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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