期刊
SMALL
卷 17, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202007242
关键词
electrolyte lean condition; graphene; lithium‐ sulfur batteries; practical energy and power density; surface functionalization
类别
资金
- European Union's Horizon 2020 research and innovation program under GrapheneCore3 Graphene Flagship [881603]
- European Union's Horizon 2020 research and innovation program under FLAG-ERA project PROSPECT
- European Union's Horizon 2020 research and innovation program under MECHANICS
- Swedish Research Council [2017-04456]
- Chalmers Areas of Advanced Materials Science and Energy, FORMAS
- Swedish Energy Agency
- Wroclaw Centre for Networking and Supercomputing [346]
- Swedish Research Council [2017-04456] Funding Source: Swedish Research Council
This study proposes grafting versatile functional groups directly on the surface of the carbon host to enhance interactions with LiPs, resulting in a stable interface between the cathode and LiPs. Experimental and theoretical results show improvements in chemical interactions, as well as enhancements in electrochemical kinetics, power, and energy densities between graphene and LiPs.
Lithium-sulfur (Li-S) batteries are considered one of the most promising energy storage technologies, possibly replacing the state-of-the-art lithium-ion (Li-ion) batteries owing to their high energy density, low cost, and eco-compatibility. However, the migration of high-order lithium polysulfides (LiPs) to the lithium surface and the sluggish electrochemical kinetics pose challenges to their commercialization. The interactions between the cathode and LiPs can be enhanced by the doping of the carbon host with heteroatoms, however with relatively low doping content (<10%) in the bulk of the carbon, which can hardly interact with LiPs at the host surface. In this study, the grafting of versatile functional groups with designable properties (e.g., catalytic effects) directly on the surface of the carbon host is proposed to enhance interactions with LiPs. As model systems, benzene groups containing N/O and S/O atoms are vertically grafted and uniformly distributed on the surface of expanded reduced graphene oxide, fostering a stable interface between the cathode and LiPs. The combination of experiments and density functional theory calculations demonstrate improvements in chemical interactions between graphene and LiPs, with an enhancement in the electrochemical kinetics, power, and energy densities.
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