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High-Rate, Ultra long Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene
Zhang YG(张跃钢); Qiu YC(丘勇才); Li WF(李宛飞); Hou Y(侯远); Liu MN(刘美男); Zhou LS(周莉莎); Ye FM(叶方敏); Li HF(李洪飞); Zhang YG(张跃钢)
2014-08
Source PublicationNANO LETTERS
Volume14Issue:8Pages:4821-4827
AbstractNitrogen-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.
KeywordNitrogen-doped Graphene Sulfur Nanoparticles Specific Capacity Cycle Life Lithium/sulfur Batteries
Indexed BySCI
Language英语
WOS IDWOS:000340446200097
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinano.ac.cn/handle/332007/1634
Collection纳米研究国际实验室_张跃钢团队
Corresponding AuthorZhang YG(张跃钢)
Recommended Citation
GB/T 7714
Zhang YG,Qiu YC,Li WF,et al. High-Rate, Ultra long Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene[J]. NANO LETTERS,2014,14(8):4821-4827.
APA Zhang YG.,Qiu YC.,Li WF.,Hou Y.,Liu MN.,...&张跃钢.(2014).High-Rate, Ultra long Cycle-Life Lithium/Sulfur Batteries Enabled by Nitrogen-Doped Graphene.NANO LETTERS,14(8),4821-4827.
MLA Zhang YG,et al."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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