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首页> 外文期刊>Advanced energy materials >Ultrafine MoO2-Carbon Microstructures Enable Ultralong-Life Power-Type Sodium Ion Storage by Enhanced Pseudocapacitance
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Ultrafine MoO2-Carbon Microstructures Enable Ultralong-Life Power-Type Sodium Ion Storage by Enhanced Pseudocapacitance

机译：超细的MoO2-碳微结构通过增强的伪电容实现超长寿命的功率型钠离子存储

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摘要

The achievement of the superior rate capability and cycling stability is always the pursuit of sodium-ion batteries (SIBs). However, it is mainly restricted by the sluggish reaction kinetics and large volume change of SIBs during the discharge/charge process. This study reports a facile and scalable strategy to fabricate hierarchical architectures where TiO2 nanotube clusters are coated with the composites of ultrafine MoO2 nanoparticles embedded in carbon matrix (TiO2@MoO2-C), and demonstrates the superior electrochemical performance as the anode material for SIBs. The ultrafine MoO2 nanoparticles and the unique nanorod structure of TiO2@MoO2-C help to decrease the Na+ diffusion length and to accommodate the accompanying volume expansion. The good integration of MoO2 nanoparticles into carbon matrix and the cable core role of TiO2 nanotube clusters enable the rapid electron transfer during discharge/charge process. Benefiting from these structure merits, the as-made TiO2@MoO2-C can deliver an excellent cycling stability up to 10 000 cycles even at a high current density of 10 A g(-1). Additionally, it exhibits superior rate capacities of 110 and 76 mA h g(-1) at high current densities of 10 and 20 A g(-1), respectively, which is mainly attributed to the high capacitance contribution.
机译：优异的倍率性能和循环稳定性一直是钠离子电池（SIB）的追求。但是，它主要受到放电/充电过程中反应动力学缓慢和SIBs体积变化的限制。这项研究报告了一种简便而可扩展的策略来制造分层结构，其中TiO2纳米管簇被嵌入碳基质中的超细MoO2纳米颗粒的复合物（TiO2 @ MoO2-C）覆盖，并证明了作为SIBs阳极材料的优异电化学性能。 MoO2超细纳米颗粒和TiO2 @ MoO2-C独特的纳米棒结构有助于减少Na +扩散长度并适应伴随的体积膨胀。 MoO2纳米颗粒与碳基质的良好结合以及TiO2纳米管簇的电缆芯作用使电子在放电/充电过程中快速转移。得益于这些结构优点，即使在10 A g（-1）的高电流密度下，制成的TiO2 @ MoO2-C仍可提供高达10,000次循环的出色循环稳定性。此外，它在10和20 A g（-1）的高电流密度下分别具有110和76 mA h g（-1）的优良倍率容量，这主要归因于高电容贡献。

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  • 来源
    《Advanced energy materials》 |2017年第15期|1602880.1-1602880.8|共8页
  • 作者

    Zhao Changtai; Yu Chang; Zhang Mengdi; Huang Huawei; Li Shaofeng; Han Xiaotong; Liu Zhibin; Yang Juan; Xiao Wei; Liang Jianneng; Sun Xueliang; Qiu Jieshan;

  • 作者单位

    Dalian Univ Technol, Sch Chem Engn, Liaoning Key Lab Energy Mat & Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China|Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

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

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

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

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

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

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

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

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

    Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada;

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

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