期刊
ACS NANO
卷 11, 期 8, 页码 8488-8498出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b04442
关键词
lithium-sulfur batteries; polysulfides; sandwich-type structure; shuttle effect; ultrahigh rate
类别
资金
- National Natural Science Foundation of China [21601191, 51572197]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
Lithium sulfur batteries practically suffer from short cycling life, low sulfur utilization, and safety concerns, particularly at ultrahigh rates and high sulfur loading. To address these problems, we have designed and synthesized a ternary NbS2@S@IG composite consisting of sandwich-type NbS2@S enveloped by iodine-doped graphed (IG). The sandwich-type structure provides an interconnected conductive network and plane-to-point intimate contact between layered NbS2 (or IG) and sulfur particles, enabling sulfur species to be efficiently entrapped and utilized at ultrahigh rates, while the structural integrity is well maintained. NbS2@S@IG exhibits prominent high power charge/discharge performances. Reversible capacities of 195, 107, and 74 mA h g(-2) (1.05 mg cm(-2)) have been achieved after 2000 cycles at ultrahigh rates of 20, 30, and 40 C, respectively, and the corresponding average decay rates per cycle are 0.022%, 0.031% and 0.033%, respectively. When the area sulfur loading is increased to 3.25 mg cm(-2), the electrode still maintains a high discharge capacity of 405 mAh g(-2) after 600 cycles at 1 degrees C. Three half-cells in series assembled with NbS2@S@IG can drive 60 indicators of LED modules after only 18 s of charging. The instantaneous current and power of the device reach 196.9 A g(-1) and 1369.7 W g(-2), respectively.
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