Abstract:
:Lithium-sulfur batteries (Li-S batteries) have attracted intense interest because of their high specific capacity and low cost, although they are still hindered by severe capacity loss upon cycling caused by the soluble lithium polysulfide intermediates. Although many structure innovations at the material and device levels have been explored for the ultimate goal of realizing long cycle life of Li-S batteries, it remains a major challenge to achieve stable cycling while avoiding energy and power density compromises caused by the introduction of significant dead weight/volume and increased electrochemical resistance. Here we introduce an ultrathin composite film consisting of naphthalimide-functionalized poly(amidoamine) dendrimers and graphene oxide nanosheets as a cycling stabilizer. Combining the dendrimer structure that can confine polysulfide intermediates chemically and physically together with the graphene oxide that renders the film robust and thin (<1% of the thickness of the active sulfur layer), the composite film is designed to enable stable cycling of sulfur cathodes without compromising the energy and power densities. Our sulfur electrodes coated with the composite film exhibit very good cycling stability, together with high sulfur content, large areal capacity, and improved power rate.
journal_name
Proc Natl Acad Sci U S Aauthors
Liu W,Jiang J,Yang KR,Mi Y,Kumaravadivel P,Zhong Y,Fan Q,Weng Z,Wu Z,Cha JJ,Zhou H,Batista VS,Brudvig GW,Wang Hdoi
10.1073/pnas.1620809114subject
Has Abstractpub_date
2017-04-04 00:00:00pages
3578-3583issue
14eissn
0027-8424issn
1091-6490pii
1620809114journal_volume
114pub_type
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