Graphene oxide as a sulfur immobilizer in high performance lithium/sulfur cells

Title: Graphene oxide as a sulfur immobilizer in high performance lithium/sulfur cells

The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (.about.tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g.sup.-1, and stable cycling for more than 50 deep cycles at 0.1 C.

Inventors:: Zhang, Yuegang; Cairns, Elton J.; Ji, Liwen; Rao, Mumin

Issue Date:: 2017-12-26

OSTI Identifier:: 1414938

Assignee:: The Regents of the University of California (Oakland, CA) LBNL

Patent Number(s):: 9,853,284

Application Number:: 15/498,113

Contract Number:: AC02-05CH11231

Resource Relation:: Patent File Date: 2017 Apr 26

Research Org:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org:: USDOE

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

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