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首页> 外文期刊>Applied Surface Science >Boosting the rate and cycling performance of β-Li_xV_2O_5 nanorods for Li ion battery by electrode surface decoration
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Boosting the rate and cycling performance of β-Li_xV_2O_5 nanorods for Li ion battery by electrode surface decoration

机译：通过电极表面装饰提高锂离子电池用β-Li_xV_2O_5纳米棒的速率和循环性能

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摘要

The beta-phase lithium vanadium oxide bronze (beta-LixV2O5) with high theoretic specific capacity up to 440 mAh g(-1) is considered as promising cathode materials, however, their practical application is hindered by its poor ionic and electronic conductivity, resulting in unsatisfied cyclic stability and rate capability. Herein, we report the surface decoration of beta-LixV2O5 cathode using both reduced oxide graphene (rGO) and ionic conductor LaPO4, which significantly promotes the electronic transfer and Li diffusion rate, respectively. As a result, the rGO/LaPO4/LixV2O5 composite exhibits excellent electrochemical performance in terms of high reversible specific capacity of 275.7 mAh g(-1) with high capacity retention of 84.1% after 100 cycles at a current density of 60 mA g(-1), and acceptable specific capacity of 170.3 mAh g(-1) at high current density of 400 mA g(-1). The cycled electrode is also analyzed by electrochemical impedance spectroscopy, ex-situ X-ray diffraction and scanning electron microscope, providing further insights into the improvement of electrochemical performance. Our work provides an effective approach to boost the electrochemical properties of lithium vanadates for practical application in lithium ion batteries.
机译：具有高达440 mAh g（-1）的高理论比容量的β相锂钒氧化物青铜（β-LixV2O5）被认为是有前途的正极材料，但是由于其较差的离子和电子导电性而阻碍了它们的实际应用，循环稳定性和速率能力不令人满意。本文中，我们报告了使用还原型氧化石墨烯（rGO）和离子导体LaPO4进行β-LixV2O5阴极的表面装饰，这分别显着促进了电子转移和Li扩散速率。结果，rGO / LaPO4 / LixV2O5复合材料在电流密度为60 mA g（-）的情况下经过100次循环后具有275.7 mAh g（-1）的高可逆比容量和84.1％的高容量保持率，表现出出色的电化学性能。 1），在400 mA g（-1）的高电流密度下可接受的比容量170.3 mAh g（-1）。还通过电化学阻抗谱，异位X射线衍射和扫描电子显微镜对循环电极进行了分析，从而为改进电化学性能提供了进一步的见识。我们的工作为提高钒酸锂的电化学性能提供了一种有效方法，可用于锂离子电池中。

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  • 来源
    《Applied Surface Science》 |2020年第may15期|145622.1-145622.8|共8页
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    Harbin Inst Technol Shenzhen Sch Mat Sci & Engn Shenzhen 518055 Peoples R China|Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China|Harbin Inst Technol MOE Key Lab Microsyst & Microstruct Mfg Harbin 150080 Peoples R China;

    Harbin Inst Technol Shenzhen Sch Mat Sci & Engn Shenzhen 518055 Peoples R China|Harbin Inst Technol MOE Key Lab Microsyst & Microstruct Mfg Harbin 150080 Peoples R China;

    Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Shenzhen Sch Mat Sci & Engn Shenzhen 518055 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    beta-LixV2O5; Cyclic stability; Reduced oxide grapheme; Ionic conductor; Surface decoration;

    机译：beta-LixV2O5;循环稳定性;氧化石墨烯减少;离子导体;表面装饰;

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