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首页> 外文期刊>Advanced energy materials >One-to-One Comparison of Graphite-Blended Negative Electrodes Using Silicon Nanolayer-Embedded Graphite versus Commercial Benchmarking Materials for High-Energy Lithium-Ion Batteries
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One-to-One Comparison of Graphite-Blended Negative Electrodes Using Silicon Nanolayer-Embedded Graphite versus Commercial Benchmarking Materials for High-Energy Lithium-Ion Batteries

机译：使用硅纳米层嵌入式石墨与商用基准材料对高能锂离子电池进行石墨混合负极的一对一比较

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摘要

While existing carbonaceous anodes for lithium-ion batteries (LIBs) are approaching a practical capacitive limit, Si has been extensively examined as a potential alternative because it shows exceptional gravimetric capacity (3579 mA h g(-1)) and abundance. However, the actual implementation of Si anodes is impeded by difficulties in electrode calendering processes and requirements for excessive binding and conductive agents, arising from the brittleness, large volume expansion (>300%), and low electrical conductivity (1.56 x 10(-3) S m(-1)) of Si. In one rational approach to using Si in high-energy LIBs, mixing Si-based materials with graphite has attracted attention as a feasible alternative for next-generation anodes. In this study, graphite-blended electrodes with Si nanolayer-embedded graphite/carbon (G/SGC) are demonstrated and detailed one-to-one comparisons of these electrodes with industrially developed benchmarking samples are performed under the industrial electrode density (> 1.6 g cc(-1)), areal capacity (> 3 mA h cm(-2)), and a small amount of binder (3 wt%) in a slurry. Because of the favorable compatibility between SGC and conventional graphite, and the well-established structural features of SGC, great potential is envisioned. Since this feasible study utilizes realistic test methods and criteria, the rigorous benchmarking comparison presents a comprehensive understanding for developing and characterizing Si-based anodes for practicable high-energy LIBs.
机译：尽管现有的锂离子电池（LIB）碳质阳极材料已接近实用的电容极限，但由于Si具有出色的重量容量（3579 mA h g（-1））和丰度，因此已广泛地研究了Si作为一种潜在的替代方法。然而，由于阳极脆性，体积膨胀大（> 300％）和电导率低（1.56 x 10（-3），导致电极压延过程中的困难以及对过量粘合剂和导电剂的要求，阻碍了硅阳极的实际实施。 ）S m（-1））。作为在高能LIB中使用Si的一种合理方法，将Si基材料与石墨混合作为下一代阳极的可行替代方案已引起关注。在这项研究中，展示了掺有Si纳米层的石墨/碳（G / SGC）的石墨混合电极，并在工业电极密度（> 1.6 g）下对这些电极与工业开发的基准样品进行了详细的一对一比较。 cc（-1）），面积容量（> 3 mA h cm（-2））和浆液中的少量粘合剂（3 wt％）。由于SGC与常规石墨之间的良好相容性，以及SGC的既定结构特征，可以预见其巨大的潜力。由于这项可行的研究利用了现实的测试方法和标准，因此严格的基准测试比较为开发和表征可行的高能LIB硅基阳极提供了全面的了解。

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  • 来源
    《Advanced energy materials》 |2017年第15期|1700071.1-1700071.9|共9页
  • 作者

    Chae Sujong; Kim Namhyung; Ma Jiyoung; Cho Jaephil; Ko Minseong;

  • 作者单位

    UNIST, 50 UNIST Gil, Ulsan 689798, South Korea;

    UNIST, 50 UNIST Gil, Ulsan 689798, South Korea;

    UNIST, 50 UNIST Gil, Ulsan 689798, South Korea;

    UNIST, 50 UNIST Gil, Ulsan 689798, South Korea;

    UNIST, 50 UNIST Gil, Ulsan 689798, South Korea|MIT, Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA;

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