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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 Co0.85Se electrocatalyst with macroporous architecture is synthesized. Besides, to improve the electronic conductivity of Co0.85Se, some defects (S-doped) are introduced into the structure of crystals. The S-doped Co0.85Se 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% Co0.85SeS additions. Moreover, high S loading cathodes are designed through in situ synthesis of Co0.85SeS on flexible carbon cloth (Co0.85SeS@CC). The porous and open framework of Co0.85SeS@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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