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

Patent ·
OSTI ID:1414938
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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.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-05CH11231
Assignee:
The Regents of the University of California (Oakland, CA)
Patent Number(s):
9,853,284
Application Number:
15/498,113
OSTI ID:
1414938
Country of Publication:
United States
Language:
English

References (3)

Sandwich-type functionalized graphene sheet-sulfur nanocomposite for rechargeable lithium batteries journal January 2011
Graphene Oxide as a Sulfur Immobilizer in High Performance Lithium/Sulfur Cells journal November 2011
Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium–Sulfur Battery Cathode Material with High Capacity and Cycling Stability journal July 2011

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Related Subjects

36 MATERIALS SCIENCE