A sulfur host based on titanium monoxide@carbon hollow spheres for advanced lithium-sulfur batteries.
A sulfur host based on titanium monoxide@carbon hollow spheres for advanced lithium-sulfur batteries.
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DOI：
10.1038/ncomms13065
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发表时间：
2016-10-20
影响因子：
16.6
通讯作者：
Lou, Xiong Wen (David)
中科院分区：
文献类型：
--
作者：
Li, Zhen;Zhang, Jintao;Guan, Buyuan;Wang, Da;Liu, Li-Min;Lou, Xiong Wen (David)
锂硫电池由于其高能量密度和成本效益而显示出下一代电能存储的优势。提高硫阴极的导电性和减缓锂多硫化物的溶解是锂硫电池成功的两个关键因素。在这里，我们报告了一种硫宿主，它同时克服了这两个障碍。钛monoxide@carbon空心纳米球具有固有的金属导电性和对锂-聚硫化物的强吸附能力，不仅可以与绝缘硫产生足够的电接触，获得高容量，而且可以有效地限制锂-聚硫化物，延长循环寿命。此外，设计的复合阴极通过使用极性壳层来阻止锂多硫化物向外扩散，从而进一步最大化了锂多硫化物的限制能力，从而避免了在极性颗粒表面化学键合所有锂多硫化物的需要。比锂离子电池具有更高能量密度的锂硫电池的前景受到硫的绝缘性和多硫化物的溶解的阻碍。在这里，作者设计了一氧化钛/碳空心纳米球，克服了这两个障碍，提高了电化学性能。
Lithium–sulfur batteries show advantages for next-generation electrical energy storage due to their high energy density and cost effectiveness. Enhancing the conductivity of the sulfur cathode and moderating the dissolution of lithium polysulfides are two key factors for the success of lithium–sulfur batteries. Here we report a sulfur host that overcomes both obstacles at once. With inherent metallic conductivity and strong adsorption capability for lithium-polysulfides, titanium monoxide@carbon hollow nanospheres can not only generate sufficient electrical contact to the insulating sulfur for high capacity, but also effectively confine lithium-polysulfides for prolonged cycle life. Additionally, the designed composite cathode further maximizes the lithium-polysulfide restriction capability by using the polar shells to prevent their outward diffusion, which avoids the need for chemically bonding all lithium-polysulfides on the surfaces of polar particles. The promise of lithium-sulfur batteries with higher energy densities than lithium-ion is hindered by the insulating nature of sulfur and dissolution of polysulfides. Here the authors design titanium monoxide/carbon hollow nanospheres that overcome both obstacles, enabling improved electrochemical properties.
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