Nano-spatially confined and interface-controlled lithiation-delithiation in an in situ formed (SnS-SnS2-S)/FLG composite: a route to an ultrafast and cycle-stable anode for lithium-ion batteries
Nano-spatially confined and interface-controlled lithiation-delithiation in an in situ formed (SnS-SnS2-S)/FLG composite: a route to an ultrafast and cycle-stable anode for lithium-ion batteries
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原位形成的 (SnS-SnS2-S)/FLG 复合材料中的纳米空间限制和界面控制的锂化-脱锂：通往锂离子电池超快且循环稳定阳极的途径
DOI：
10.1039/c9ta03996a
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发表时间：
2019-07-07
影响因子：
11.9
通讯作者：
Che, Renchao
中科院分区：
文献类型：
--
作者：
Cheng, Deliang;Yang, Lichun;Che, Renchao
高性能负极材料的开发是锂离子电池发展的关键挑战之一。在此，我们报告了微纳米结构的（SnS-SnS 2-S）/FLG（少层石墨烯）复合材料，其中原位形成的SnS，SnS 2和S纳米粒子被原位剥离的FLG紧密支撑。多相结构可以诱导形成高比例的界面，从而实现界面控制的锂/脱锂，其特征在于大的界面储存和快速的界面扩散，并且在高速率下大大提高电极性能。另一方面，S、SnS 2和SnS的逐步锂化/脱锂可以提供纳米空间限制效应以适应体积膨胀和颗粒聚集，从而增强电极的结构稳定性。同时，FLG基质可以用作坚固的层以进一步保持电极的结构完整性。作为锂离子电池的负极，该复合材料表现出很好的重量/体积容量（0.2 A g（-1）时为1062.2 mA h g（-1）/2018 mA h cm（-3）），反硝化（即使在5.0/10.0 A g（-1）下也为842/756 mA h g（-1））和超稳定的循环能力（在1.0/10.0 A g（-1）下1000/2000次循环后100%/93.6%的容量保持率）。即使在全电池和钠离子电池中，也表现出卓越的综合性能。因此，（SnS-SnS 2-S）/FLG复合材料有望成为一种新型的电池负极材料。
The exploitation of high-performance anode materials is one of the key challenges for the development of lithium-ion batteries. Herein, we report a micro-nano structured (SnS-SnS2-S)/FLG (few-layer graphene) composite in which the in situ formed SnS, SnS2 and S nanoparticles are tightly supported by the in situ exfoliated FLG. The multi-phase structure could induce the formation of a high fraction of interfaces, enabling the interface-controlled lithiation/delithiation, which is characterized by large interfacial storage and fast interfacial diffusion, and boosting the electrode performance at high rates greatly. On the other hand, the step-wise lithiation/delithiation of S, SnS2 and SnS can offer nano-spatial confinement effects to accommodate the volume expansion and particle aggregation, and thus enhance the structural stability of the electrode. Meanwhile, the FLG matrix can serve as a robust layer to further maintain the structural integrity of the electrode. As an anode for lithium-ion batteries, the composite exhibits an ultrahigh gravimetric/volumetric capacity (1062.2 mA h g(-1)/2018 mA h cm(-3) at 0.2 A g(-1)), ultrahigh rate (842/756 mA h g(-1) even at 5.0/10.0 A g(-1)) and ultrastable cyclability (100%/93.6% capacity retention after 1000/2000 cycles at 1.0/10.0 A g(-1)). Even in full-cells and sodium-ion batteries, superb comprehensive performance is demonstrated. Therefore, the (SnS-SnS2-S)/FLG composite could be a new promising anode material for application in batteries.