脉冲激光沉积CrP薄膜及其电化学性能

采用脉冲激光溅射Cr和P粉的混合靶成功制备了CrP薄膜，选区电子衍射(SAED)和光电子能谱(XPS)分析显示经过真空原位400℃退火以后，薄膜主要由多晶态的CrP组成。非原位HRTEM和SEM测试结果表明CrP薄膜在充放电前后的形貌有较大的改变。SAED、充放电和循环伏安测试证实了CrP和锂的电化学反应机理如下：CrP在Li⁺的驱动下，生成了Cr和Li₃P。在其后的充放电过程中，发生了Li在LiP中可逆的嵌入和脱出反应。由于CrP首次容量高达1 168 mAh·g^-1以及在0.7 V左右具有平稳的放电平台，显示了它可能成为一种新型的锂离子电池的负极材料。

Electrochemical Properties of CrP Thin Film Electrode Fabricated by Pulsed Laser Deposition

CrP thin film has been fabricated by pulsed laser ablation of mixed target of Cr and P powder. The structural and morphological changes of the as-deposited thin film have been investigated by a combination of SEM, SAED and HRTEM methods. Moreover, the electrochemical properties of CrP have been studied by charge/discharge and cylic voltammetry measurements. The electrochemical mechanism of CrP with lithium may involve the irreversible decomposition of CrP into the metal Cr and Li₃P driven by lithium ions and the subsequent reversible conversion of LiP into Li₃P formed after the initial discharge. The high reversible capacity of 827 mAh·g^-1 with the low flat discharge platform of 0.7 V made CrP a qualified potential candidate of electrode for rechargeable lithium batteries.