Interfacial lithium-nitrogen bond catalyzes sulfide oxidation reactions in high-loading Li2S cathode

文献类型： 外文期刊

第一作者： Wang, Jian

作者： Wang, Jian;Li, Tie;Li, Linge;Cheng, Shuang;Hu, Huimin;Huang, Min;Hu, Hongfei;Zhang, Su;Lin, Hongzhen;Xiao, Qingbo;Zhang, Jing;Duan, Shaorong;Jia, Lujie;Duan, Shaorong;Jia, Lujie;Wang, Jian;Li, Linge

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关键词： Lithium sulfur battery; Sulfide oxidation reaction; Catalytic effect; Lithium-nitrogen bond; High areal loading

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：16.744； 五年影响因子：14.61 ）

ISSN： 1385-8947

年卷期： 2022 年 429 卷

页码：

收录情况： SCI

摘要： Lithium sulfur batteries have exhibited unparalleled advantages in energy density. However, the sulfide oxidation reactions (SORs) in sulfur cathode are much more sluggish, which is mainly restricted by high conversion barriers. Herein, the catalytic "Li-N" bond sites are designed to activate SORs in high areal loading cathode with the multi-functions of bridging the active materials and carbon matrix tightly. The presence of catalytic "Li-N" bonds is co-revealed by X-ray photoelectronic spectroscopy and electronic energy loss spectroscope. As unraveled by theoretical physical van der Waals interaction analysis and various electrochemical tests, the improved kinetics and mechanism of SORs are achieved by motivating polysulfide interconversions and propelling lithium ion diffusion. Consequently, the so-fabricated electrode with abundant Li-N bond catalytic sites deliveries 900 mA h g-1 at 0.05 C and a stable retention of 74.3% at 1 C after 300 cycles. More impressively, high-loading with high-weight-content cathodes remain rapid SORs kinetics, high capacity utilization and retention from 3.0 to 6.9 mg cm-2. At 6.5 mg cm-2, the cathode displays 550 mA h g-1 at 0.76 mA cm-2 corresponded to 3.58 mA h cm-2, which is better than many reports. These results shed light on using intrinsic catalytic sites to realize application of batteries.

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