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首页> 外文期刊>Advanced energy materials >Concurrently Approaching Volumetric and Specific Capacity Limits of Lithium Battery Cathodes via Conformal Pickering Emulsion Graphene Coatings
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Concurrently Approaching Volumetric and Specific Capacity Limits of Lithium Battery Cathodes via Conformal Pickering Emulsion Graphene Coatings

机译：通过共形泡沫乳液石墨烯涂层同时接近锂电池阴极的体积和特定容量限制

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摘要

To achieve the high energy densities demanded by emerging technologies, lithium battery electrodes need to approach the volumetric and specific capacity limits of their electrochemically active constituents, which requires minimization of the inactive components of the electrode. However, a reduction in the percentage of inactive conductive additives limits charge transport within the battery electrode, which results in compromised electrochemical performance. Here, an electrode design that achieves efficient electron and lithium-ion transport kinetics at exceptionally low conductive additive levels and industrially relevant active material areal loadings is introduced. Using a scalable Pickering emulsion approach, Ni-rich LiNi0.8Co0.15Al0.05O2 (NCA) cathode powders are conformally coated using only 0.5 wt% of solution-processed graphene, resulting in an electrical conductivity that is comparable to 5 wt% carbon black. Moreover, the conformal graphene coating mitigates degradation at the cathode surface, thus providing improved electrochemical cycle life. The morphology of the electrodes also facilitates rapid lithium-ion transport kinetics, which provides superlative rate capability. Overall, this electrode design concurrently approaches theoretical volumetric and specific capacity limits without tradeoffs in cycle life, rate capability, or active material areal loading.
机译：为了实现新兴技术所需的高能量密度，锂电池电极需要接近其电化学活性成分的体积和比容量限制，这需要最小化电极的无活性组分。然而，无活性导电添加剂百分比的降低限制电池电极内的电荷传输，这导致电化学性能受损。这里，引入了在特殊低导电添加剂水平和工业相关的活性材料的高效电子和锂离子输送动力学和工业相关的活性材料的电极设计的电极设计。使用可伸缩的皮克林乳液方法，使用仅0.5wt％的溶液加工的石墨烯共形地涂覆Ni-RINI0.8CO0.15A15A15A10.05O2（NCA）阴极粉末，导致与5wt％炭黑相当的电导率。 。此外，保形石墨烯涂层减轻阴极表面的劣化，从而提供改善的电化学循环寿命。电极的形态还促进了快速的锂离子输送动力学，其提供高级速率能力。总的来说，该电极设计同时接近理论体积和特定容量限制，无需循环寿命，速率能力或活性材料的折衷。

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  • 来源
    《Advanced energy materials》 |2020年第25期|2001216.1-2001216.11|共11页
  • 作者

    Park Kyu-Young; Lim Jin-Myoung; Luu Norman S.; Downing Julia R.; Wallace Shay G.; Chaney Lindsay E.; Yoo Hocheon; Hyun Woo Jin; Kim Hyeong-U; Hersam Mark C.;

  • 作者单位

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA|Sungkyunkwan Univ SKKU SKKU Adv Inst Nanotechnol Suwon 16419 Gyeonggi Do South Korea;

    Northwestern Univ Dept Mat Sci & Engn Evanston IL 60208 USA|Northwestern Univ Dept Chem 2145 Sheridan Rd Evanston IL 60208 USA|Northwestern Univ Dept Elect & Comp Engn Evanston IL 60208 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    graphene; high capacity; lithium-ion batteries; Ni-rich cathodes; Pickering emulsions;

    机译：石墨烯;高容量;锂离子电池;富含Ni的阴极;皮克林乳液;

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