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Qiu, Yongcai; Li, Wanfei; Zhao, Wen; Li, Guizhu; Hou, Yuan; Liu, Meinan; Zhou, Lisha; Ye, Fangmin; Li, Hongfei; Wei, Zhanhua; Yang, Shihe; Duan, Wenhui; Ye, Yifan; Guo, Jinghua; Zhang, Yuegang
Nano letters, 08/2014, Letnik: 14, Številka: 8Journal Article
Nitrogen-doped graphene (NG) is a promising conductive matrix material for fabricating high-performance Li/S batteries. Here we report a simple, low-cost, and scalable method to prepare an additive-free nanocomposite cathode in which sulfur nanoparticles are wrapped inside the NG sheets (S@NG). We show that the Li/S@NG can deliver high specific discharge capacities at high rates, that is, ∼1167 mAh g–1 at 0.2 C, ∼1058 mAh g–1 at 0.5 C, ∼971 mAh g–1 at 1 C, ∼802 mAh g–1 at 2 C, and ∼606 mAh g–1 at 5 C. The cells also demonstrate an ultralong cycle life exceeding 2000 cycles and an extremely low capacity-decay rate (0.028% per cycle), which is among the best performance demonstrated so far for Li/S cells. Furthermore, the S@NG cathode can be cycled with an excellent Coulombic efficiency of above 97% after 2000 cycles. With a high active S content (60%) in the total electrode weight, the S@NG cathode could provide a specific energy that is competitive to the state-of-the-art Li-ion cells even after 2000 cycles. The X-ray spectroscopic analysis and ab initio calculation results indicate that the excellent performance can be attributed to the well-restored C–C lattice and the unique lithium polysulfide binding capability of the N functional groups in the NG sheets. The results indicate that the S@NG nanocomposite based Li/S cells have a great potential to replace the current Li-ion batteries.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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