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General Synthesis of MxS (M = Co, Cu) Hollow Spheres with Enhanced Sodium-Ion Storage Property in Ether-Based Electrolyte
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-01-17 , DOI: 10.1021/acs.iecr.9b06023
Qi Xu 1 , Ting Chen 1 , Zhenguo Wu 1 , Yihua Liu 1 , Lang Qiu 1 , Zuguang Yang 1 , Dong Wang 1 , Wei Xiang 2 , Benhe Zhong 1 , Xiaodong Guo 1, 3
Affiliation  

As one of the promising anode candidates of sodium-ion batteries, the development of transition metal sulfides (TMSs) was severely limited by the large volume variation and sluggish kinetics during sodiation/desodiation processes. Integrated optimizations including preparation method, structure design, electrolyte, etc. are highly in demand. Herein, a general synthesis method of MxS (M = Co, Cu) hollow spheres is developed. After a combined modification of the cut-off voltages and electrolytes, the as-prepared MxS samples exhibit improved sodium-ion storage properties. A high capacity of 470 mAh g–1 with 88% capacity retention at 100 mA g–1 after 100 cycles is delivered by CoS. As to Cu1.765S, a reversible capacity of 317.6 mAh g–1 with no obvious capacity decay could be found at 100 mA g–1 after 100 cycles. The selected NaCF3SO3/diethylene glycol dimethyl ether electrolyte plays a crucial role in promoting the electrochemical property of the MxS samples. This general synthesis method and electrolyte optimization strategy is expected to be applicable to other TMS anodes.

中文翻译:

在醚基电解质中具有增强的钠离子存储性能的M x S(M = Co,Cu)空心球的一般合成

作为钠离子电池极有希望的阳极候选材料之一,过渡金属硫化物(TMSs)的开发受到严重的体积变化和在减盐/脱盐过程中反应迟缓的动力学的限制。急需包括制备方法,结构设计,电解质等在内的集成优化。在此,开发了M x S(M = Co,Cu)空心球的一般合成方法。组合修改截止电压和电解质后,制备的M x S样品具有改善的钠离子存储性能。CoS提供了470 mAh g –1的高容量,并在100个循环后在100 mA g –1下具有88%的容量保持率。关于铜1.765S,经过100次循环后,在100 mA g –1处可逆容量为317.6 mAh g –1,没有明显的容量衰减。所选的NaCF 3 SO 3 /二甘醇二甲醚电解质在促进M x S样品的电化学性能方面起着至关重要的作用。这种通用的合成方法和电解质优化策略有望应用于其他TMS阳极。
更新日期:2020-01-17
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