双层壳结构 Co$_{\bf 2.7}\rm {\bf Cu_{0.3}O_{4}}$ 立方体复合材料的制备及锂电性能

通过溶剂热法合成了 Co/Cu-BTC 实心立方体前驱体, 并以此为自牺牲模板在空气中煅烧得到双层壳结构 Co$_{2.7}$Cu$_{0.3}$O$_{4}$ 立方体复合材料, 使用 X 射线衍射(X-ray diffraction, XRD)仪、扫描电子显微镜(scanning electron microscope, SEM)和透射电子显微镜(transmission electron microscope, TEM)对材料进行物相形貌分析. 结果表明: 制备的 Co$_{2.7}$Cu$_{0.3}$O$_{4}$ 具有双层壳立方体结构. 制备的复合材料作为锂电池负极材料, 表现出优异的循环稳定性能, 这归因于其独特的双层壳结构有效地缩短了电子转移路程, 缓解了在充放电过程中的体积膨胀, 保持了结构的稳定性.

Synthesis of double layer Co$_{\bf 2.7}$Cu$_{\bf 0.3}$O$_{\bf 4 }$ cubes composites with enhanced lithium ion battery performance

Co/Cu-BTC solid cube precursors were synthesised by solvent thermal methods, and double-layer Co$_{2.7}$Cu$_{0.3}$O$_{4}$ cube composites were obtained by calcining in air using Co/Cu-BTC as a self-sacrificing template. The phase morphologies of the materials were analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). Following this, the prepared double-layer Co$_{2.7}$Cu$_{0.3}$O$_{4}$ cube composites were employed as anode materials for lithium ion batteries, which exhibited excellent cycling stability. This can be attributed to its unique double layer cube structure, which can effectively shorten the electron transfer path and alleviate the volume expansion in the process of charging and discharging, thus maintaining the stability of the structure.