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

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United States of America Patent

PATENT NO 9673452
SERIAL NO

14347600

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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 (˜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−1, and stable cycling for more than 50 deep cycles at 0.1 C.

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  • THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cairns, Elton J Walnut Creek, US 15 203
Ji, Liwen Richland, US 85 326
Rao, Mumin El Cerrito, US 10 91
Zhang, Yuegang Cupertino, US 88 2279

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