期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 33, 页码 29849-29857出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08006
关键词
lithium-sulfur batteries; high-sulfur-loaded cathodes; electrode fabrication; crack-free electrodes; Li2S deposition
资金
- Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT [2018M1A2A2063807]
- KAIST Institute for NanoCentury (KINC)
- National Research Foundation of Korea [2018M1A2A2063807] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Despite the notable progress in the development of rechargeable lithium-sulfur batteries over the last decade, achieving high performance with high-sulfur-loaded sulfur cathodes remains a key challenge on the path to the commercialization of practical lithium-sulfur batteries. This paper presents a novel method by which to fabricate a crack free sulfur electrode with an ultrahigh sulfur loading (16 mg cm(-2)) and a high sulfur content (64%). By introducing a porous scaffold on the top of a cast of sulfur cathode slurry, the formation of cracks during the drying of the cast can be prevented due to the lower volume shrinkage of the skin. The scaffold-supported sulfur cathode delivers a notably high capacities of 10.3 mAh cm(-2) and 473 mAh cm(-3) after a prolonged cycle, demonstrating that the crack-free structure renders more uniform redox reactions at such high sulfur loading. The highly packed, crack-free feature of the sulfur cathode is advantageous, given that it reduces the electrolyte uptake to as low as an E/S ratio of 4 mu L mg(-1), which additionally contributes to the high energy density. Therefore, the scaffold-supported drying fabrication method as presented here provides an effective route by which to design practically viable, energy-dense lithium-sulfur-batteries.
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