【摘要】 采用脉冲激光溅射Fe和Se粉末的混合靶制备FeSe薄膜并用XRD、充放电和循环伏安测试研究了薄膜的结构和电化学性质.XRD结果显示,当基片温度为200℃时,薄膜主要由晶态的FeSe组成.在电压1.0～3.0V范围内,该薄膜的可逆容量为360.8mAh·g-1,经过100次循环之后的放电容量为396.5mAh·g-1,具有很好的循环性能.ex situ XRD结果显示FeSe能够和Li发生可逆的电化学反应,颗粒尺寸大于5nm的纳米铁颗粒能够驱动Li2Se的分解并在充电过程中重新生成FeSe.FeSe具有较高的可逆容量和较好的循环性能,可能成为一种优良的锂二次电池正极材料.更多还原

【Abstract】 FeSe thin film has been successfully fabricated by pulsed laser ablation of mixed target of Fe and Se powder. The structural and electrochemical properties of the as-deposited thin films have been investigated by X-ray diffraction (XRD), the charge/discharge and cyclic voltammetry (CV) measurements. The thin film deposited at 200 ℃ was mainly composed of crystallized FeSe. In the range of 1.0～3.0 V, the reversible discharge capacities was 360.8 mAh·g-1. After 100 cycles, the discharge capacity was 396.5 mAh·g-1, indicating a stable cycle performance. Ex situ XRD results showed that FeSe could react with Li reversibly. Nanosized metal iron whose crystal size was more than 5 nm could also drive the decomposition of Li2Se and reform FeSe after charging to 3.0 V. Owing to its high reversible capacity and good cycle ability, FeSe was demonstrated to be a promising cathode material for future rechargeable lithium batteries.更多还原