发明名称 |
GRAPHENE OXIDE AS A SULFUR IMMOBILIZER IN HIGH PERFORMANCE LITHIUM/SULFUR CELLS |
摘要 |
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. |
申请公布号 |
US2014234702(A1) |
申请公布日期 |
2014.08.21 |
申请号 |
US201214347600 |
申请日期 |
2012.09.28 |
申请人 |
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA |
发明人 |
Zhang Yuegang;Cairns Elton J.;Ji Liwen;Rao Mumin |
分类号 |
H01M4/583;C07D303/38;C01B31/26 |
主分类号 |
H01M4/583 |
代理机构 |
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代理人 |
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主权项 |
1. A composition of matter comprising:
a graphene oxide-sulfur (GO-S) nanocomposite, wherein GO further comprises a plurality of functional groups and S is bonded to carbon atoms. |
地址 |
Oakland CA US |