期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802472
关键词
emulsion; low-tortuosity; magnetic alignment; thick electrodes
类别
资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy [DE-AC02-05CH11231, 7056592]
- DOE Office of Science [DE-AC02-06CH11357]
- National Synchrotron Light Source II, Brookhaven National Laboratory, under U.S. DOE Contract [DE-SC0012704]
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.
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