Uniform α-Ni(OH)2 hollow spheres constructed from ultrathin nanosheets as efficient polysulfide mediator for long-term lithium-sulfur batteries

作者：Dai, Chunlong; Hu, Linyu; Wang, Min-Qiang; Chen, Yuming^*; Han, Jin; Jiang, Jian; Zhang, Yan; Shen, Bolei; Niu, Yubin; Bao, Shu-Juan; Xu, Maowen^*

来源：Energy Storage Materials, 2017, 8: 202-208.

DOI：10.1016/j.ensm.2017.04.003

• Hierarchical alpha-Ni(OH)(2) nanosheets
• Double-shell hollow structures
• Lithium-sulfur batteries
• Polysulfides
• Encapsulation

Lithium-sulfur (Li-S) batteries are of great importance as promising electrochemical-energy storage systems in view of their overwhelming advantage of energy density. However, their commercial applications are still far away mainly due to fast capacity decay in a high sulfur content caused by low utilization of active material and severe polysulfide dissolution during electrochemical cycling. Here we have designed and prepared uniform alpha-Ni(OH)(2) hollow spheres constructed from ultrathin nanosheets with the thickness of similar to 3.5 nm as a hollow sulfur nanosphere host for Li-S batteries. Specifically, the synthesized hierarchical hollow spheres not only manifest the advantages of hollow structure and robust protective shell to encapsulate a very high content of sulfur up to 81 wt%, but also offer sufficient functionalized surfaces to directly bond and entrap polysulfides in hollow sphere. When used as cathode materials for Li-S batteries, the S@Ni(OH)(2) double-shell hollow hybrids exhibit a highly stable cycle life over 1000 cycles at 1 C with a very small capacity decay rate of only similar to 0.04% per cycle.

• 出版日期2017-7
• 单位西南大学