Journal
ENERGY TECHNOLOGY
Volume 1, Issue 2-3, Pages 186-192Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201200019
Keywords
ceramics; electrochemistry; electron transport; energy storage; lithium
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Funding
- Japan Science and Technology Agency (JST)
- Core Research for Evolutional Science and Technology (CREST)
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [10J08610, 21246098] Funding Source: KAKEN
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Sulfur-nanocarbon composites were prepared by mechanical milling at high temperature (155 degrees C), and the electrochemical performance of all-solid-state Li/S batteries was investigated with Li2S-P2S5 solid electrolytes. We aimed to increase the sulfur content in the sulfur-based composite electrodes to enhance the energy density in the Li/S batteries. The composites included 50 wt% sulfur, which is twice as high as that in the all-solid-state Li/S batteries that use sulfide-based solid electrolytes reported to date, and high-temperature mechanical milling resulted in a small sulfur particle size with a large contact area between the particles. The improved composites are mainly responsible for the excellent cyclability (1050 mAhg(-1) for 50 cycles), high gravimetric energy density (1007 Whkg(-1)), and good rate capability of the assembled batteries. These composites are promising positive-electrode materials for rechargeable Li/S batteries with high energy density. This approach of mechanical milling at high temperature is widely applicable and can be extended to a variety of materials in versatile energy devices as well as rechargeable lithium batteries.
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