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首页> 外文期刊>Advanced energy materials >Fabrication of Low-Tortuosity Ultrahigh-Area-Capacity Battery Electrodes through Magnetic Alignment of Emulsion-Based Slurries
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Fabrication of Low-Tortuosity Ultrahigh-Area-Capacity Battery Electrodes through Magnetic Alignment of Emulsion-Based Slurries

机译：乳液基浆料的磁对准法制备低曲折超高容量电池电极

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摘要

High energy-density, low-cost batteries are critically important to a variety of applications ranging from portable electronics to electric vehicles (EVs) and grid-scale storage. While tremendous research effort has been focused on new materials or chemistries with high energy-density potential, design innovations such as low-tortuosity thick electrodes are another promising path toward higher energy density and lower cost. Growing demand for fast-charging batteries has also highlighted the need for negative electrodes that can accept high rate charging without metal deposition; low tortuosity can be a benefit in this regard. However, a general and scalable fabrication method for low-tortuosity electrodes is currently lacking. Here an emulsion-based, magnetic-alignment approach to producing thick electrodes (400 mu m thickness) with ultrahigh areal capacity (up to approximate to 14 mAh cm(-2) vs 2-4 mAh cm(-2) for conventional lithium ion) is reported. The process is demonstrated for LiCoO2 and meso-carbon microbead graphite. The LiCoO2 cathodes are confirmed to have low tortuosity via DC-depolarization experiments and deliver high areal capacity (10 mAh cm(-2)) in galvanostatic discharge tests at practical C-rates and model EV drive-cycle tests. This simple fabrication method can potentially be applied to many other active materials to enable thick, low-tortuosity electrodes.
机译：高能量密度，低成本电池对于从便携式电子产品到电动汽车（EV）以及网格规模存储的各种应用都至关重要。尽管大量的研究工作集中在具有高能量密度潜力的新材料或化学材料上，但是诸如低曲折厚度的电极之类的设计创新是通往更高能量密度和更低成本的另一条有希望的途径。对快速充电电池的需求不断增长也突显了对负极的需求，这种负极可以接受高速充电而不会沉积金属。在这方面低曲折可能是一个好处。然而，目前缺乏用于低曲率电极的通用且可扩展的制造方法。这是一种基于乳剂的磁取向方法，可生产具有超高面积容量（高达约14 mAh cm（-2）的传统电极，厚度为2-4 mAh cm（-2）的厚电极（厚度大于400微米）离子）。已证明该工艺适用于LiCoO2和中碳微珠石墨。 LiCoO2阴极通过直流去极化实验被证实具有较低的曲折度，并且在实际C速率和模型EV驱动循环测试的恒电流放电测试中可提供较高的面容量（> 10 mAh cm（-2））。这种简单的制造方法可以潜在地应用于许多其他活性材料，以实现厚而低曲折的电极。

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  • 来源
    《Advanced energy materials》 |2019年第2期|1802472.1-1802472.7|共7页
  • 作者

    Li Linsen; Erb Randall M.; Wang Jiajun; Wang Jun; Chiang Yet-Ming;

  • 作者单位

    MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA|Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Dept Chem Engn, Shanghai 200240, Peoples R China|Shanghai Electrochem Energy Devices Res Ctr, Shanghai 200240, Peoples R China;

    Northeastern Univ, Dept Mech & Ind Engn, Boston, MA 02115 USA;

    Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA;

    Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA;

    MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA;

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

    emulsion; low-tortuosity; magnetic alignment; thick electrodes;

    机译：乳液;低曲度;磁性取向;厚电极;

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