Shaikh Shoyebmohamad F, Aftab Sikandar, Pandit Bidhan, Al-Enizi Abdullah M, Ubaidullah Mohd, Ekar Satish, Hussain Sajjad, Khollam Yogesh B, More Pravin S, Mane Rajaram S
Department of Chemistry, College of Science, King Saud, University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
Department of Intelligent Mechatronics Engineering, Sejong University, Seoul 05006, South Korea.
Dalton Trans. 2023 Aug 22;52(33):11481-11488. doi: 10.1039/d3dt01414b.
The successful deployment of sodium-ion batteries (SIBs) requires high-performance sustainable and cost-effective anode materials having a high current density. In this regard, sodium disulphide (NiS) has been prepared as a composite with activated carbon (C) using a facile hydrothermal synthesis route in the past. The X-ray diffraction pattern of the as-prepared NiS/C composite material shows well-defined diffraction peaks of NiS. Most carbonaceous materials are amorphous, and the Brunauer-Emmett-Teller (BET) study shows that the surface area is close to 148 m g. At a current density of 50 mA g, the NiS/C composite exhibits a high capacity of 480 mA h g during the initial cycle, which subsequently decreases to 333 mA h g after the completion of the 100 cycle. The NiS/C composite electrode provides an exceptional rate capability by delivering a capacity of 270 mA h g at a high current density of 2000 mA g, suggesting the suitability of the NiS/C composite for SIBs. X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) analyses at the Ni K-edge have been used to examine the type of chemical bonding present in the anode and also how it changes during electrochemical redox cycling. The understanding of the sodium storage mechanism is improved by the favorable results, which also offer insights for developing high-performance electrode materials for rechargeable SIBs.
钠离子电池（SIBs）的成功部署需要具有高电流密度的高性能、可持续且具有成本效益的负极材料。在这方面，过去已通过简便的水热合成路线制备了二硫化镍（NiS）与活性炭（C）的复合材料。所制备的NiS/C复合材料的X射线衍射图谱显示出定义明确的NiS衍射峰。大多数含碳材料是无定形的，而布鲁诺尔-埃米特-泰勒（BET）研究表明其表面积接近148 m²/g。在50 mA/g的电流密度下，NiS/C复合材料在初始循环期间表现出480 mA h/g的高容量，在100次循环完成后降至333 mA h/g。NiS/C复合电极在2000 mA/g的高电流密度下提供270 mA h/g的容量，展现出卓越的倍率性能，表明NiS/C复合材料适用于SIBs。已利用Ni K边的X射线吸收近边结构（XANES）和扩展X射线吸收精细结构（EXAFS）分析来研究负极中存在的化学键类型以及其在电化学氧化还原循环过程中的变化。这些良好的结果有助于深入了解钠存储机制，也为开发用于可充电SIBs的高性能电极材料提供了思路。
