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High-Rate, Ultra long Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene
文献类型：期刊论文
| 作者 | Li WF(李宛飞)
|
| 刊名 | NANO LETTERS
 |
| 出版日期 | 2014-08 |
| 卷号 | 14期号:8页码:4821-4827 |
| 关键词 | Nitrogen-doped graphene sulfur nanoparticles specific capacity cycle life lithium/sulfur batteries |
| 通讯作者 | 张跃钢 |
| 英文摘要 | 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, similar to 1167 mAh g(-1) at 0.2 C, similar to 1058 mAh g(-1) at 0.5 C, similar to 971 mAh g(-1) at 1 C, similar to 802 mAh g(-1) at 2 C, and similar to 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 (6096) 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000340446200097 |
| 公开日期 | 2014-12-02 |
| 源URL | [http://ir.sinano.ac.cn/handle/332007/1634]  |
| 专题 | 苏州纳米技术与纳米仿生研究所_纳米研究国际实验室_张跃钢团队 |
| 推荐引用方式 GB/T 7714 | Li WF. High-Rate, Ultra long Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene[J]. NANO LETTERS,2014,14(8):4821-4827. |
| APA | Li WF.(2014).High-Rate, Ultra long Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene.NANO LETTERS,14(8),4821-4827. |
| MLA | Li WF."High-Rate, Ultra long Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene".NANO LETTERS 14.8(2014):4821-4827. |
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