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首页> 外文期刊>Advanced energy materials >MoSe_2@CNT Core–Shell Nanostructures as Grain Promoters Featuring a Direct Li_2O_2 Formation/Decomposition Catalytic Capability in Lithium-Oxygen Batteries
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MoSe_2@CNT Core–Shell Nanostructures as Grain Promoters Featuring a Direct Li_2O_2 Formation/Decomposition Catalytic Capability in Lithium-Oxygen Batteries

机译：MOSE_2 @ CNT核 - 壳纳米结构作为晶粒促进剂，具有锂 - 氧气电池的直接Li_2O_2形成/分解催化能力

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摘要

For lithium-oxygen batteries (LOBs), the strong oxidant intermediate and byproducts during the charge/discharge process are the main reasons for the degradation of the electrochemical performance. Searching for highly efficient catalysts for the direct formation/decomposition of Li2O2 is essential for the development of LOBs. In this study, core-shell nanostructured MoSe2@CNT with uniform MoSe2 coating layers are purposefully synthesized through a facile hydrothermal strategy to address the negative intermediate and side-product issues, therefore enhancing the battery performance. The continuous and multiwalled MoSe2 layers can not only work as grain promoters that induce the initial nucleation and growth of equiaxed Li2O2 grains on the cathode surface even under a high rate, but also prevent the byproducts formation from corrosive issues between carbon and electrolyte. Moreover, density functional theory (DFT) calculations reveal the intrinsic layer dependent direct formation/decomposition catalytic capability of 2D MoSe2 and the LiO2 avoidable reaction pathway during the discharge/charge process, theoretically revealing the direct epitaxial growth mechanisms of Li2O2. As a consequence, the MoSe2@CNT cathode exhibited a superior specific capacity over 32 000 mAh g(-1), excellent rate capabilities, and ultralong cycle life of 280 cycles at a high rate of 500 mA g(-1).
机译：锂氧电池（LOB）中，强氧化剂中间和副产物在充电/放电过程是用于电化学性能的劣化的主要原因。搜索对于Li2O2直接形成/分解高效催化剂是LOB的发展至关重要。在这项研究中，核 - 壳纳米结构MoSe2 @ CNT具有均匀MoSe2涂覆层通过一个浅显的水热策略以解决负中间体和旁产品问题有意合成，因此提高了电池的性能。连续和多壁MoSe2层不仅可以作为晶型启动子在诱导所述阴极表面上的初始成核和等轴Li2O2晶粒的生长，即使在高速率，而且还可以防止从碳和电解质之间的腐蚀性问题的副产物形成的工作。此外，密度泛函理论（DFT）计算揭示在放电/充电过程2D MoSe2和LiO2避免反应途径的本征层依赖性直接形成/分解催化能力，理论上揭示Li2O2的直接外延生长机制。作为结果，MoSe2 @ CNT阴极表现出超过32 000毫安克（-1）的500毫安克（-1）的高率优异的比容量，优异的速率能力，和280个循环超长循环寿命。

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  • 来源
    《Advanced energy materials》 |2021年第18期|2003263.1-2003263.12|共12页
  • 作者

    He Biao; Li Gaoyang; Li Jiajia; Wang Jun; Tong Hui; Fan Yuqi; Wang Weiliang; Sun Shuhui; Dang Feng;

  • 作者单位

    Shandong Univ Minist Educ Key Lab LiquidSolid Struct Evolut & Proc Mat Jinan 250061 Peoples R China;

    Shandong Univ Minist Educ Key Lab LiquidSolid Struct Evolut & Proc Mat Jinan 250061 Peoples R China;

    Shandong Univ Minist Educ Key Lab LiquidSolid Struct Evolut & Proc Mat Jinan 250061 Peoples R China;

    Shandong Univ Minist Educ Key Lab LiquidSolid Struct Evolut & Proc Mat Jinan 250061 Peoples R China;

    Cent South Univ Sch Met & Environm Changsha 410083 Peoples R China;

    Shandong Normal Univ Inst Environm & Ecol Jinan 250014 Peoples R China;

    Shandong Normal Univ Inst Environm & Ecol Jinan 250014 Peoples R China;

    Inst Natl Rech Sci Ctr Energie Mat & Telecommun Varennes PQ J3X 1S2 Canada;

    Shandong Univ Minist Educ Key Lab LiquidSolid Struct Evolut & Proc Mat Jinan 250061 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Li2O2 formation; decomposition; lithium#8208; oxygen batteries; MoSe2@CNT;

    机译：Li2O2形成;分解;锂＆＃8208;氧气电池;MOSE2 @ CNT;

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