Facile synthesis and electrochemical properties of Co–S composites as negative materials for alkaline rechargeable batteries
Facile synthesis and electrochemical properties of Co–S composites as negative materials for alkaline rechargeable batteries
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DOI：
10.1016/j.electacta.2010.10.029
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发表时间：
2011
影响因子：
6.6
通讯作者：
Qinghong Wang;Lifang Jiao;Hongmei Du;Wenxiu Peng;Dawei Song;Yijing Wang;H. Yuan
中科院分区：
文献类型：
--
作者：
Qinghong Wang;Lifang Jiao;Hongmei Du;Wenxiu Peng;Dawei Song;Yijing Wang;H. Yuan
通过简便的水热法制备了一系列由金属 Co 和 Co9S8 组成的新型 Co-S 复合材料，并作为二次碱性电池的负极进行了研究。仪器分析表明，Co9S8 纳米薄片的加入可以更好地分散 Co 颗粒，并增加 Co 颗粒之间的间距，从而大大增加 Brunauer-Emmett-Teller (BET) 表面积。因此，Co电极的电化学性能显着提高。 Co-S电极的最大放电容量达到420mAhg−1，并在200次循环后保持在410mAhg−1，远高于纯Co电极的容量。 CV曲线中氧化还原峰的移动和放电电位平台的负向移动归因于复合材料中硫的溶解，这也有利于Co的容量。测量结果表明，高度分散的Co和Co(OH)2之间的可逆法拉第反应在Co-S复合材料中占主导地位。
A series of novel Co–S composites composed of metallic Co and Co9S8were prepared via a facile hydrothermal method and investigated as negative electrodes for secondary alkaline batteries. Instrumental analyses reveal that the incorporation of Co9S8nanoflakes leads to better dispersion of Co particles and increases the interspacing between Co particles, greatly increasing the Brunauer–Emmett–Teller (BET) surface area. Thus, the electrochemical performance of the Co electrode is significantly improved. The maximum discharge capacity of the Co–S electrode reaches 420mAhg−1and remains at 410mAhg−1after 200 cycles, which is much higher than the capacity of a pure Co electrode. The shift of the redox peaks in the CV curves and the negative movement of the discharge–potential plateau are attributed to the dissolution of sulfur in the composite, which also favors the capacity of Co. The measurements reveal that the reversible faradic reaction between highly dispersed Co and Co(OH)2is dominant for the Co–S composites.