Desulfurization-Induced Formation of Amorphized Substoichiometric Tin Sulfide for Super High-Rate Capacity and Degradation-Free Cycling of Na Ion Storage,Small

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Desulfurization-Induced Formation of Amorphized Substoichiometric Tin Sulfide for Super High-Rate Capacity and Degradation-Free Cycling of Na Ion Storage
Small ( IF 13.0 ) Pub Date : 2022-06-14 , DOI: 10.1002/smll.202201467
Jing Xiang ₁ , Zhong-Jie Jiang ₁ , Yongjie Wang ₂ , Zhongqing Jiang ₃

Affiliation

This work reports an amorphization and partial desulfurization method to improve the performance of sulfide-based materials for Na⁺ storage. Specifically, the polypyrrole derived carbon coated amorphous substoichiometric tin sulfide supported on aminated carbon nanotubes (PPY-C@SnS_x/ACNTs) with amorphized and substoichiometric tin sulfide (SnS_x) is synthesized by simply thermal annealing the PPY-C@SnS₂/ACNTs. The PPY-C@SnS_x/ACNTs shows stable reversible capacities of 410.2 mAh g⁻¹ for Na⁺ storage at 0.1 A g⁻¹ and excellent rate capacities of 270.2, 235.5, 217.4, and 210.0 mAh g⁻¹ at 5.0, 10.0, 20.0, and 30.0 A g⁻¹, respectively. Nearly zero drops on the reversible capacities can be observed when it is sodiated/desodiated at 2.0, 5.0, and 10.0 A g⁻¹ for up to 1000, 6500, 8000 cycles, respectively. Its outstanding rate capacities and degradation-free cycling stabilities mainly arise from the amorphized and substoichiometric structure of SnS_x, which improve the reversible capacities and Na⁺ diffusivities of the PPY-C@SnS_x/ACNTs. The density functional theory (DFT) calculations indicate that the partial desulfurization can improve the electric conductivity and promote the sodiation/desodiation of SnS_x. It explains why the PPY-C@SnS_x/ACNTs can exhibit high performance for Na⁺ storage well.

中文翻译：

非晶化亚化学计量硫化锡的脱硫诱导形成用于钠离子存储的超高倍率容量和无降解循环

这项工作报告了一种非晶化和部分脱硫方法，以提高硫化物基材料的钠离子^存储性能。具体而言，聚吡咯衍生的碳包覆无定形亚化学计量硫化锡负载在胺化碳纳米管 (PPY-C@SnS _x /ACNTs) 上，具有非晶化和亚化学计量的硫化锡 (SnS _x )，通过简单地对 PPY-C@SnS ₂ /进行热退火来合成。无碳纳米管。PPY-C@SnS _x /ACNTs在 0.1 A g ^{-1下显示出 410.2 mAh g}^-1的稳定可逆容量和^{270.2、235.5、217.4}和 210.0 mAh g ^{-1的优异倍率容量}分别为 5.0、10.0、20.0 和 30.0 A g ^-1。^{当其在 2.0、5.0 和 10.0 A g -1}的钠化/脱钠条件下分别进行高达 1000、6500、8000 次循环时，可以观察到可逆容量几乎为零的下降。其出色的倍率容量和无降解循环稳定性主要来自 SnS _x的非晶化和亚化学计量结构，这提高了 PPY-C@SnS _x /ACNTs的可逆容量和 Na ^{+扩散率。}密度泛函理论(DFT)计算表明，部分脱硫可以提高电导率，促进SnS _x的钠化/脱钠。它解释了为什么 PPY-C@SnS _x^{/ACNTs可以很好地表现出Na +}存储的高性能。

更新日期：2022-06-14

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