Double-walled N-doped carbon@NiCo2S4 hollow capsules as SeS2 hosts for advanced Li–SeS2 batteries†,Journal of Materials Chemistry A

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Double-walled N-doped carbon@NiCo2S4 hollow capsules as SeS2 hosts for advanced Li–SeS2 batteries†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-04-16 00:00:00 , DOI: 10.1039/c9ta02695a
Bingshu Guo _{1,

2,

3,

4,

5} , Tingting Yang _{1,

2,

3,

4,

5} , Wenyan Du _{1,

2,

3,

4,

5} , Qianru Ma _{1,

2,

3,

4,

5} , Long-zhen Zhang _{1,

2,

3,

4,

5} , Shu-Juan Bao _{1,

2,

3,

4,

5} , Xiaoyan Li _{6,

7,

8,

9} , Yuming Chen _{10,

11,

12,

13,

14} , Maowen Xu _{1,

2,

3,

4,

5}

Affiliation

Selenium sulfide as a new class of cathode materials can enhance the conductivity of insulating sulfur which causes rapid capacity degradation and low coulombic efficiency of lithium–sulfur (Li–S) batteries. In this work, selenium disulfide (SeS₂) as an active ingredient is encapsulated into double-walled N-doped carbon (NC)@NiCo₂S₄ hollow capsules (NiCo₂S₄@NC) to obtain high-performance Li–SeS₂ batteries. On the basis of ensuring excellent electrical conductivity, the hollow NiCo₂S₄ lining and its NC coating can not only suppress the shuttle effect of polyselenium/sulfide by the combined merits of chemical adsorption and physical constraint, but also are able to buffer the volume expansion of SeS₂. Moreover, the polar NiCo₂S₄ is beneficial for enhancing the redox kinetics of lithium polyselenium/sulfide. As expected, the NiCo₂S₄@NC–SeS₂ cathode delivers high reversible capacities of 1205.1 mA h g⁻¹ at 0.1C and 673.5 mA h g⁻¹ at 2.0C. More importantly, the hybrid cell can show ultralong cycling life up to 800 cycles at 1.0C with the attenuation rate as low as 0.038% per cycle, which is superior to that of NiCo₂S₄–SeS₂ and NC–SeS₂ composites.

中文翻译：

双层N掺杂碳@NiCo ₂ S ₄空心胶囊作为SeS ₂主体，用于高级Li–SeS ₂电池†

硫化硒作为新型的阴极材料可以增强绝缘硫的导电性，从而导致锂硫（Li–S）电池的容量迅速下降且库伦效率降低。在这项工作中，将二硫化硒（SeS ₂）作为有效成分封装到双壁N掺杂碳（NC）@NiCo ₂ S ₄中空胶囊（NiCo ₂ S ₄ @NC）中，以获得高性能的Li-SeS _2个电池。在确保优异的导电性的基础上，空心NiCo ₂ S ₄衬里及其NC涂层不仅可以通过化学吸附和物理约束的结合优点抑制聚硒硫化物的穿梭效应，而且可以缓冲SeS ₂的体积膨胀。此外，极性NiCo ₂ S ₄有利于增强聚硒锂/硫化物的氧化还原动力学。正如所料，镍钴₂小号₄ @ NC-SES ₂阴极提供1205.1毫安汞柱高可逆容量^-1在0.1C和673.5毫安汞柱^-1在2.0C。更重要的是，该混合电池在1.0C的温度下可显示多达800个循环的超长循环寿命，且每个循环的衰减率低至0.038％，优于NiCo。₂ S₄ -SeS₂和NC-SeS₂复合材料。

更新日期：2019-04-16

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