Accelerated polysulfide redox in binder‐free Li₂S cathodes promises high‐energy‐density lithium-sulfur batteries

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dc.contributor.authorFan, Q.
dc.contributor.authorJiang, J.
dc.contributor.authorZhang, S.
dc.contributor.authorZhou, T.
dc.contributor.authorPang, W.K.
dc.contributor.authorGu, Q.
dc.contributor.authorLiu, H.
dc.contributor.authorGuo, Z.
dc.contributor.authorWang, J.
dc.date.issued2021
dc.descriptionFirst published: 26 June 2021
dc.description.abstractChallenges 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.
dc.description.statementofresponsibilityQining Fan, Jicheng Jiang, Shilin Zhang, Tengfei Zhou, Wei Kong Pang, Qinfen Gu, Huakun Liu, Zaiping Guo, and Jiazhao Wang
dc.identifier.citationAdvanced Energy Materials, 2021; 11(32):2100957-1-2100957-12
dc.identifier.doi10.1002/aenm.202100957
dc.identifier.issn1614-6832
dc.identifier.issn1614-6840
dc.identifier.orcidZhang, S. [0000-0002-3268-5708]
dc.identifier.orcidGuo, Z. [0000-0003-3464-5301]
dc.identifier.urihttp://hdl.handle.net/2440/131363
dc.language.isoen
dc.publisherWiley
dc.relation.granthttp://purl.org/au-research/grants/arc/LP160100914
dc.relation.granthttp://purl.org/au-research/grants/arc/DP180101453
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101862
dc.relation.granthttp://purl.org/au-research/grants/arc/DE190100504
dc.rights© 2021 Wiley-VCH GmbH
dc.source.urihttps://doi.org/10.1002/aenm.202100957
dc.subjectHhigh energy densities, Li2S2 /Li2S deposition, Li–S batteries; lithium sulfide cathodes; polyvinylidene difluorides
dc.titleAccelerated polysulfide redox in binder‐free Li₂S cathodes promises high‐energy‐density lithium-sulfur batteries
dc.title.alternativeAccelerated polysulfide redox in binder‐free Li(2)S cathodes promises high‐energy‐density lithium-sulfur batteries
dc.typeJournal article
pubs.publication-statusPublished

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