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Type: Journal article
Title: Accelerated polysulfide redox in binder‐free Li₂S cathodes promises high‐energy‐density lithium-sulfur batteries
Other Titles: Accelerated polysulfide redox in binder‐free Li(2)S cathodes promises high‐energy‐density lithium-sulfur batteries
Author: Fan, Q.
Jiang, J.
Zhang, S.
Zhou, T.
Pang, W.K.
Gu, Q.
Liu, H.
Guo, Z.
Wang, J.
Citation: Advanced Energy Materials, 2021; 11(32):2100957-1-2100957-12
Publisher: Wiley
Issue Date: 2021
ISSN: 1614-6832
Statement of
Qining Fan, Jicheng Jiang, Shilin Zhang, Tengfei Zhou, Wei Kong Pang, Qinfen Gu, Huakun Liu, Zaiping Guo, and Jiazhao Wang
Abstract: Challenges from the insulating S and Li2S2/Li2S (Li2S1–2) discharge products are restricting the development of the high-energy-density Li–S battery system. The deposition of insulating Li2S1–2 on the surfaces of S based cathodes (e.g., S and Li2S) limits the reaction kinetics, leading to inferior electrochemical performance. In this work, the impact of binders on the deposition of Li2S1–2 on S based cathodes is revealed, along with the interaction between polyvinylidene difluoride and Li2S/polysulfides. This interaction can obstruct the electrochemical reactions near the binder, leading to dense deposition of insulating Li2S1–2 that covers the cathode surface. Without such a binder, localized and uniform Li2S1–2 deposition throughout the whole cathode can be achieved, effectively avoiding surface blockage and significantly improving electrode utilization. A full battery constructed with a binder-free Li2S cathode delivers a gravimetric and volumetric energy density of 331.0 Wh kg−1 and 281.5 Wh L−1, under ultrahigh Li2S loading (16.2 mgLi2S cm−2) with lean electrolyte (2.0 µL mgLi2S−1), providing a facile but practical approach to the design of next-generation S-based batteries.
Keywords: Hhigh energy densities, Li2S2 /Li2S deposition, Li–S batteries; lithium sulfide cathodes; polyvinylidene difluorides
Description: First published: 26 June 2021
Rights: © 2021 Wiley-VCH GmbH
DOI: 10.1002/aenm.202100957
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Chemical Engineering publications

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