Anion-Doped Cobalt Selenide with Porous Architecture for High-Rate and Flexible Lithium–Sulfur Batteries,Small Methods

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Anion-Doped Cobalt Selenide with Porous Architecture for High-Rate and Flexible Lithium–Sulfur Batteries
Small Methods ( IF 10.7 ) Pub Date : 2021-08-15 , DOI: 10.1002/smtd.202100649
Tao Feng ₁ , Teng Zhao ₁ , Shuangfei Zhu ₁ , Nanxiang Zhang ₁ , Zhuangzhuang Wei ₁ , Ke Wang ₁ , Li Li _{1,

2,

3} , Feng Wu _{1,

2,

3} , Renjie Chen _{1,

2,

3}

Affiliation

Emerging catalytic host for sulfur is an effective approach to breaking the limits of lithium–sulfur batteries for practical applications. Herein, the hydrangea-shaped Co_0.85Se electrocatalyst with macroporous architecture is synthesized. Besides, to improve the electronic conductivity of Co_0.85Se, some defects (S-doped) are introduced into the structure of crystals. The S-doped Co_0.85Se exhibited an outstanding electrocatalytic effect on lithium polysulfides conversion and can induce and regulate uniform growth of insoluble Li₂S on its surface due to the synergistic adsorption by Se and S. As a result, the S/C cathode achieved a high initial capacity of 1340.6 mAh g⁻¹ at 0.5 C and a stable cycling capacity of 666.6 mAh g⁻¹ at 1 C after 500 cycles by 5 wt% Co_0.85SeS additions. Moreover, high S loading cathodes are designed through in situ synthesis of Co_0.85SeS on flexible carbon cloth (Co_0.85SeS@CC). The porous and open framework of Co_0.85SeS@CC facilitated electrolyte infiltration and accommodated the volume change of sulfur during the charge/discharge process. Taking by these advantages, a high areal capacity of 9.663 mAh cm⁻² is achieved at a high sulfur loading of 9.98 mg cm⁻². Even at a high current density of 15 mA cm⁻², a reversible capacity of 603.7 mAh g⁻¹ is maintained at a sulfur loading of 6.52 mg cm⁻². This proposed work provides a feasible approach to high-rate and flexible Li–S batteries.

中文翻译：

具有多孔结构的阴离子掺杂硒化钴，用于高速率和柔性锂硫电池

新兴的硫催化主体是打破锂硫电池实际应用限制的有效方法。在此，合成了具有大孔结构的绣球花状Co _0.85 Se电催化剂。此外，为了提高Co _0.85 Se的电子导电性，在晶体结构中引入了一些缺陷（S掺杂）。S掺杂的Co _0.85 Se对多硫化锂的转化表现出突出的电催化作用，由于Se和S的协同吸附，可以诱导和调节不溶性Li ₂ S在其表面均匀生长。因此，S/C正极达到了 1340.6 mAh g ^-1的高初始容量在 0.5 C 和 666.6 mAh g ^-1的稳定循环容量在 1 C 500 次循环后通过 5 wt% Co _0.85 SeS 添加。此外，通过在柔性碳布（Co _0.85 SeS@CC）上原位合成 Co _0.85 SeS设计了高 S 负载阴极。Co _0.85 SeS@CC的多孔开放框架促进了电解质的渗透并适应了充电/放电过程中硫的体积变化。利用这些优势，在 9.98 mg cm ^{-2 的}高硫负载量下实现了 9.663 mAh cm ^-2的高面积容量。即使在 15 mA cm ^-2的高电流密度下，603.7 mAh g ^-1的可逆容量保持在6.52 mg cm ^-2的硫负载。这项提议的工作为高倍率和灵活的 Li-S 电池提供了一种可行的方法。

更新日期：2021-09-14

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