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首页> 外文期刊>Advanced Functional Materials >A Phase Transformation-Resistant Electrode Enabled by a MnO_2-Confined Effect for Enhanced Energy Storage
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A Phase Transformation-Resistant Electrode Enabled by a MnO_2-Confined Effect for Enhanced Energy Storage

机译：MnO_2约束效应实现的抗相变电极增强储能

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摘要

Although the transition metal oxides/hydroxides are regarded as highly promising and attractive materials for efficient energy storage, a precycling/activation process is usually adopted to stabilize phase components and achieve reversible output. Moreover, the intrinsic mechanism involved in precycling process is not always concerned and remains to be further decoupled. Herein, overcoming the challenges associated with the MnO2-confined effect is proposed, which is enabled by in situ dissolving-out and conversion of Mn species in MnO2 derived from the Co-induced effect. Notably, a high electrochemical stability without activation and a superior initial Coulombic efficiency of 96.2% can be achieved without any precycling or activation process, which increases by 33.5% in comparison to the efficiency of the hybrids without MnO2 surface-confined effect. And a specific capacity up to 164 mAh g(-1) at 2 A g(-1) can be achieved with an excellent capacity retention rate of 90% at 30 A g(-1), which only drops slightly and remains at a high level of 87% even after 5000 cycles. This strategy may function as a model for the design and configuration of highly stable electrodes toward high-efficient energy storage and conversion applications.
机译：尽管过渡金属氧化物/氢氧化物被认为是有效储能的极有希望和有吸引力的材料，但通常采用预循环/活化过程来稳定相组分并实现可逆输出。而且，涉及预循环过程的内在机制并不总是被关注，并且有待进一步分离。本文中，提出了克服与MnO 2限制效应相关的挑战的方法，该挑战是通过原位溶解和转化源自Co诱导效应的MnO 2中的Mn物种而实现的。值得注意的是，无需任何预循环或活化过程，就可以实现没有活化的高电化学稳定性和96.2％的优异初始库仑效率，与没有MnO2表面限制作用的杂化剂的效率相比，该效率提高了33.5％。并且在2 A g（-1）时可以实现高达164 mAh g（-1）的比容量，在30 A g（-1）时具有90％的出色容量保持率，该容量保持率仅略有下降，并保持在即使经过5000次循环，仍达到87％的高水平。该策略可以用作针对高效能量存储和转换应用的高度稳定电极的设计和配置的模型。

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  • 来源
    《Advanced Functional Materials》 |2019年第27期|1901342.1-1901342.10|共10页
  • 作者

    Guo Wei; Yu Chang; Li Shaofeng; Song Xuedan; Yang Ying; Qiu Bo; Zhao Changtai; Huang Huawei; Yang Juan; Han Xiaotong; Li Dan; Qiu Jieshan;

  • 作者单位

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China;

    Univ Melbourne, Dept Chem Engn, Parkville, Vic 3010, Australia;

    Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Dalian 116024, Liaoning, Peoples R China|Beijing Univ Chem Technol, Coll Chem Engn, Beijing 100029, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    carbonate hydroxide; MnO2; phase transformation; rate performance; stability;

    机译：氢氧化碳;MnO2;相变;速率性能;稳定性;

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