Polycation Binders: An Effective Approach toward Lithium Polysulfide Sequestration in Li–S Batteries

Su, Haiping; Fu, Chengyin; Zhao, Yifan; Long, Donghui; Ling, Licheng; Wong, Bryan M.; Lu, Jun; Guo, Juchen

doi:10.1021/acsenergylett.7b00779

Title: Polycation Binders: An Effective Approach toward Lithium Polysulfide Sequestration in Li–S Batteries

Journal Article · Fri Oct 06 00:00:00 EDT 2017 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.7b00779· OSTI ID:1466403

Su, Haiping ^[1]; Fu, Chengyin ^[2]; Zhao, Yifan ^[2]; Long, Donghui ^[3]; Ling, Licheng ^[3];

^[2];

^[4];

^[2]

East China Univ. of Science and Technology, Shanghai (People's Republic of China); Univ. of California, Riverside, CA (United States)
Univ. of California, Riverside, CA (United States)
East China Univ. of Science and Technology, Shanghai (People's Republic of China)
Argonne National Lab. (ANL), Argonne, IL (United States)

Lithium polysulfide sequestration by polymeric binders in lithium-sulfur battery cathodes is investigated in this study. We prove polycations can effectively adsorb lithium polysulfides via Coulombic attraction between the positively charged backbone and the polysulfide anions. For the first time, we measure the simultaneous mass change of the sulfur cathodes with poly(diallyldimethylammonium triflate) (PDAT) and polyvinylpyrrolidone (PVP) binders during Iithiation-delithiation using electrochemical quartz crystal microbalance (EQCM). The EQCM results demonstrate significantly higher mass gain with PDAT binder under identical conditions, providing direct evidence that PDAT is a superior binder. The advantage of polycation binders is also proved by charge-discharge cycling combined with ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy. As a result, with the PDAT binder and minimized electrolyte/sulfur weight ratio, we further demonstrate electrodes with high sulfur loading achieving 4.2 mAh cm^-2 areal capacity.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1466403

Journal Information:: ACS Energy Letters, Vol. 2, Issue 11; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 38 works

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