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Constructing hierarchical SnS2 hollow micron cages anchored on S-doped graphene as anodes for superior performance alkali-ion batteries
Electrochimica Acta ( IF 6.6 ) Pub Date : 2022-11-28 , DOI: 10.1016/j.electacta.2022.141590
Yun-Lei Hou , Jing-Zhou Chen , Tao Qin , Hao-Bo Guan , Sheng-Guang Wang , Rui Zeng , Dong-Lin Zhao

Two-dimensional layered metal sulfides have been regarded as worthwhile anodes for Lithium/Sodium-ion batteries (LIBs/SIBs) due to their extraordinary specific capacity and outstanding cyclic stability. Nevertheless, the sluggish reaction kinetics of alkali ions and pulverization in the process of discharging/ charging still restrict further development of layered metal sulfides. Therefore, reasonable structure design and surface optimization become efficacious ways to solve this issue. Herein, a hollow micron cage with a hierarchical structure composed of SnS2 nanosheets anchoring on S-doped reduced graphene oxide (H-SnS2@rGO) was prepared by a two-step hydrothermal method. The layered SnS2 nanosheets provide remarkable kinetic conditions for the rapidly diffusion of alkali ions. Moreover, the synergistic effect of hollow structure and rGO makes H-SnS2@rGO exhibit satisfactory electrochemical performance. Which displays a prominent rate capacity (874.1 mA h g−1 at 5 A g−1) in LIBs and an admirable specific capacity (613.3 mA h g−1 at 0.1 A g−1 after 100 cycles) in SIBs. This work opens up a new route for the use of two-dimensional layered sulfides as anode materials for new-type alkali-ion batteries.



中文翻译:

构建锚定在 S 掺杂石墨烯上的分层 SnS2 空心微米笼作为高性能碱离子电池的阳极

二维层状金属硫化物因其非凡的比容量和出色的循环稳定性而被认为是锂/钠离子电池 (LIBs/SIBs) 有价值的负极材料。尽管如此,碱离子缓慢的反应动力学和充放电过程中的粉化问题仍然制约着层状金属硫化物的进一步发展。因此,合理的结构设计和表面优化成为解决这一问题的有效途径。在此,采用两步水热法制备了由锚定在 S 掺杂还原氧化石墨烯 (H-SnS 2 @rGO) 上的 SnS 2纳米片组成的分级结构的空心微米笼。层状 SnS 2纳米片为碱金属离子的快速扩散提供了卓越的动力学条件。此外,空心结构与rGO的协同作用使得H-SnS 2 @rGO表现出令人满意的电化学性能。它在 LIB 中显示出显着的倍率容量(在 5 A g -1时为874.1 mA hg -1 ),在 SIB 中显示出令人钦佩的比容量(100 个循环后在 0.1 A g -1时为 613.3 mA hg -1 )。该工作为二维层状硫化物作为新型碱离子电池负极材料开辟了一条新途径。

更新日期:2022-11-28
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