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Graphene oxide as a sulfur immobilizer in high performance lithium/sulfur cells
Graphene oxide as a sulfur immobilizer in high performance lithium/sulfur cells
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机译:氧化石墨烯作为高性能锂/硫电池中的硫固定剂
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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.
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机译:由于多硫化物溶解而导致的硫阴极材料的损失会导致可充电锂/硫电池的显着容量衰减。本发明的实施方案使用化学方法经由氧化石墨烯上的反应性官能团固定硫和多硫化锂。该方法通过化学反应沉积策略和随后的低温热处理工艺在氧化石墨烯片上获得了均匀且薄的(约几十纳米)硫涂层。氧化石墨烯与硫或多硫化物之间的强相互作用表明锂/硫电池具有950-1400 mAh g -1 Sup>的高可逆容量,并在0.1 C下稳定循环超过50个深循环。
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