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Porous SnO2 nanostructure with a high specific surface area for improved electrochemical performance

机译：具有高比表面积的多孔SnO2纳米结构，可提高电化学性能

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摘要

Tin oxide (SnO2) has been attractive as an alternative to carbon-based anode materials because of its fairly high theoretical capacity during cycling. However, SnO2 has critical drawbacks, such as poor cycle stability caused by a large volumetric variation during the alloying/de-alloying reaction and low capacity at a high current density due to its low electrical conductivity. In this study, we synthesized a porous SnO2 nanostructure (n-SnO2) that has a high specific surface area as an anode active material using the Adams fusion method. From the Brunauer-Emmett-Teller analysis and transmission electron microscopy, the as-prepared SnO2 sample was found to have a mesoporous structure with a fairly high surface area of 122 m(2) g(-1) consisting of highly-crystalline nanoparticles with an average particle size of 5.5 nm. Compared to a commercial SnO2, n-SnO2 showed significantly improved electrochemical performance because of its increased specific surface area and short Li+ ion pathway. Furthermore, during 50 cycles at a high current density of 800 mA g(-1), n-SnO2 exhibited a high initial capacity of 1024 mA h g(-1) and enhanced retention of 53.6% compared to c-SnO2 (496 mA h g(-1) and 23.5%).
机译：氧化锡（SnO2）作为碳基阳极材料的替代物是具有吸引力的，因为循环期间的理论能力相当高。然而，SnO2具有关键缺点，例如由于其低电导率，在合金/除合金化反应期间由合金化/除合金化反应的大容量变化和低容量而导致的较差的循环稳定性。在该研究中，我们合成了一种多孔SnO2纳米结构（N-SNO2），其具有使用ADAMS熔融方法作为阳极活性材料的高比表面积。从Brunauer-Emmett-Teller分析和透射电子显微镜检查中，发现如制备的SnO2样品具有介孔结构，具有相当高的表面积为122米（2 )g（-1）的高度结晶纳米粒子平均粒度为5.5nm。与商业SnO2相比，N-SnO2由于其增加的表面积和短Li +离子途径而显示出显着改善的电化学性能。此外，在800mA g（-1）的高电流密度的50个循环期间，N-SnO2表现出1024 mA Hg（-1）的高初始容量，与C-SnO2相比增强了53.6％的保留（496 mA Hg （-1）和23.5％）。

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  • 来源
    《RSC Advances》 |2020年第18期|共7页
  • 作者

    Kim Hyeona; Kim Min-Cheol; Kim Sung-beom; Kim Yo-Seob; Choi Jin-Hyeok; Park Kyung-Won;

  • 作者单位

    Soongsil Univ Dept Chem Engn Seoul 06987 South Korea;

    Soongsil Univ Dept Chem Engn Seoul 06987 South Korea;

    Soongsil Univ Dept Chem Engn Seoul 06987 South Korea;

    Soongsil Univ Dept Chem Engn Seoul 06987 South Korea;

    Soongsil Univ Dept Chem Engn Seoul 06987 South Korea;

    Soongsil Univ Dept Chem Engn Seoul 06987 South Korea;

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  • 正文语种 eng
  • 中图分类 化学;
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