| 脉冲激光沉积NiCo2S4薄膜及其电化学特征 | |
| Pulsed Laser Deposited NiCo2S4 Thin Films and Investigation of Their Electrochemical Properties | |
| 摘要: 采用脉冲激光沉积法制备了NiCo2S4薄膜,利用恒流充放电和循环伏安测试研究了NiCo2S4薄膜作为锂离子电池负极材料的电化学性能和充放电机理。采用高分辨电子显微镜和选区电子衍射(TEM&SAED)表征了NiCo2S4薄膜首次循环过程中的组成与结构变化。恒流充放电测试结果显示NiCo2S4薄膜在3 μA·cm-2的放电电流下,0~3 V(vs Li+/Li)范围内,薄膜的首次放电容量为698 mAh·g-1,经过200次循环之后的放电容量为365 mAh·g-1;在循环伏安测试中得到了分步反应的可逆氧化还原峰。TEM和SAED分析结果揭示了NiCo2S4薄膜与Li的电化学反应机理：首次放电过程中NiCo2S4与Li发生转化反应生成了Li2S、Ni和Co,充电后生成了CoS和NiS复合薄膜。后续循环为CoS和NiS复合薄膜的可逆分解与形成。研究表明NiCo2S4是一种有潜在应用价值的锂离子电池负极材料。 | |
| 关键词: NiCo2S4 薄膜 脉冲激光沉积 负极 锂离子电池 | |
| 基金项目: 中国工程物理研究院科学技术基金(No.2013A0302014)和中国工程物理研究院超精密加工技术重点实验室基金(No.ZZ13007)资助项目。 | |
| Abstract: NiCo2S4 thin films have been successfully prepared by pulsed laser deposition. The structural, electrochemical properties and reaction mechanism of the NiCo2S4 thin film anodes for lithium ion batteries have been investigated by transmission electron microscopy (TEM), selected-area electron diffraction measurements (SAED), the charge/discharge measurements and cyclic voltammetry (CV). The charge/discharge results suggested that in the range of 0~3.0 V(vs Li+/Li), the reversible discharge capacity was 698 mAh·g-1 at a current density of 3 μA·cm-2. After 200 cycles, the discharge capacity was 365 mAh·g-1. Multistep reactions are revealed by the CV data of NiCo2S4 thin films. Ex situ TEM results showed that NiCo2S4 could react with Li to form Li2S, Co and Ni during initial discharging and NiS and CoS formed upon charging. The reversible electrochemical reacting occurred between NiS, CoS and Li2S, Co, Ni during the following cycles. NiCo2S4 was believed to be a promising anode material for rechargeable lithium batteries due to its good cycle performance. | |
| Keywords: NiCo2S4 thin films pulsed laser deposition anode lithium ion batteries | |
| 投稿时间：2015-03-10 修订日期：2015-09-16 | |
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| 刘家斌,张辉,崔艳华,刘效疆,刘敬松.脉冲激光沉积NiCo2S4薄膜及其电化学特征[J].无机化学学报,2015,31(12):2331-2336. | |
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