期刊
NANO LETTERS
卷 22, 期 14, 页码 5982-5989出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c02258
关键词
lithium-sulfur batteries; nanopores; charge transport; active material utilization; energy density
类别
资金
- Natural Science Foundation of China [52072137]
- Innovation Fund of Wuhan National Laboratory for Optoelectronics of Huazhong University of Science and Technology
The study presents the design of chunky sulfur/graphene particle electrodes, which achieve stable electrodes and high utilization of active materials through the vertical alignment of active sulfur and the inclusion of heteroatoms in chunky graphene particles.
One main challenge of realizing high-energy-density lithium-sulfur batteries is low active materials utilization, excessive use of inert components, high electrolyte intake, and mechanical instability of high-mass-loading sulfur cathodes. Herein, chunky sulfur/graphene particle electrodes were designed, where active sulfur was confined in vertically aligned nanochannels (width similar to 12 nm) of chunky graphene-based particles (similar to 70 mu m) with N, O-containing groups. The short charge transport distance and low tortuosity enabled high utilization of active materials for high-mass-loading chunky sulfur/graphene particle electrodes. The intermediate polysulfide trapping effect by capillary effect and heteroatoms-containing groups, and a mechanically robust graphene framework, helped to realize stable electrode cycling. The as-designed electrode showed high areal capacity (10.9 mAh cm(-2)) and high sulfur utilization (72.4%) under the rigorous conditions of low electrolyte/active material ratio (similar to 2.5 mu L mg(-1)) and high sulfur loading (9.0 mg cm(-2)), realizing high energy densities (520 Wh kg(-1), 1635 Wh L--(1)).
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