Accelerated polysulfide redox in binder‐free Li₂S cathodes promises high‐energy‐density lithium-sulfur batteries
Date
2021
Authors
Fan, Q.
Jiang, J.
Zhang, S.
Zhou, T.
Pang, W.K.
Gu, Q.
Liu, H.
Guo, Z.
Wang, J.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Advanced Energy Materials, 2021; 11(32):2100957-1-2100957-12
Statement of Responsibility
Qining Fan, Jicheng Jiang, Shilin Zhang, Tengfei Zhou, Wei Kong Pang, Qinfen Gu, Huakun Liu, Zaiping Guo, and Jiazhao Wang
Conference Name
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.
School/Discipline
Dissertation Note
Provenance
Description
First published: 26 June 2021
Access Status
Rights
© 2021 Wiley-VCH GmbH