A nanoporous nitrogen-doped graphene for high performance lithium sulfur batteries

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• 作者：Shuang-Ke Liu ; ^{liu_sk@139.com} ; Xiao-Bin Hong ; Yu-Jie Li ; Jing Xu ; Chun-Man Zheng ; ^{zhengchunman@hotmail.com} ; Kai Xie
• 关键词：Lithium sulfur battery ; Sulfur cathode ; Porous graphene ; Nitrogen doping ; High performance
• 刊名：Chinese Chemical Letters
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：28
• 期：2
• 页码：412-416
• 全文大小：1688 K
• 卷排序：28

文摘

A nanoporous N-doped reduced graphene oxide (p-N-rGO) was prepared through carbothermal reaction between graphene oxide and ammonium-containing oxometalates as sulfur host for Li–S batteries. The p-N-rGO sheets have abundant nanopores with diameters of 10–40 nm and the nitrogen content is 2.65 at%. When used as sulfur cathode, the obtained p-N-rGO/S composite has a high reversible capacity of 1110 mAh g−1 at 1C rate and stable cycling performance with 781.8 mAh g−1 retained after 110 cycles, much better than those of the rGO/S composite. The enhanced electrochemical performance is ascribed to the rational combination of nanopores and N-doping, which provide efficient contact and wetting with the electrolyte, accommodate volume expansion and immobilize polysulfides during cycling.