中文摘要：

采用脉冲激光沉积法在不锈钢基片上制备了纳米结构的CuF2薄膜,其充放电性能显示该薄膜具有540mAh·g^-1可逆容量,对应于每个CuF2可与2.0个Li发生反应.其循环伏安特性显示在2.2和2.8V（vs Li/Li^＋）处出现了一对新的氧化还原峰.充放电后薄膜的组成与结构通过非原位高分辨电子显微和选区电子衍射来表征.结果揭示了纳米结构CuF2薄膜的电化学反应机理,LiF在过渡金属Cu的驱动下可以发生可逆的分解和形成.

英文摘要：

Nanostructured CuF2 thin films were prepared by pulsed laser deposition on stainless steel substrates. The charge and discharge curves showed a high reversible capacity of 540 mAh·g^-1, corresponding to 2.0 Li per CuF2. The cyclic voltammograms showed that a new couple of reduction and oxidation peaks at 2.2 and 2.8 V （vs Li/Li^＋） appeared for the first time. The components and structure of the films after charging and discharging were characterized by ex-situ high-resolution transmission electron microscopy and selected area electron diffraction measurements. Electrochemical reaction mechanism of nanostructured CuF2 thin films with lithium was revealed, in which the reversible decomposition and formation of LiF driven by transition metal Cu were involved.