不同晶相的Ni2P和Ni12P5纳米材料的制备与研究

Preparation and study of Ni2P and Ni12P5 nanomaterials with different crystal phases

采用一锅法合成了六方相的Ni2P纳米粒子,用多次注入法合成了四方相的Ni12P5纳米粒子。多次注入法相比于一锅法,更易控制颗粒的形貌。利用XPS、XRD、TEM、EDX等仪器对合成材料的结构进行表征。结果表明,磷化镍呈中空结构。研究其电化学性能发现,电流密度均为54.2 mA/g时,Ni2P纳米粒子的首次充电/放电比容量为422.8/644.4 mAh/g,Ni12P5纳米粒子首次充电/放电比容量为327/604 mAh/g,由此表明,它们均具有较高的充放电比容量,循环可逆性能良好,可用于新型锂离子电池负极材料。

The hexagonal Ni2P nanoparticles were synthesized by one-pot method,and the tetragonal Ni12P5 nanoparticles were synthesized by multiple injection methods.The multiple injection method is easier to control the morphology of the particles than the one-pot method.The structure of the composite material was characterized by XPS,XRD,TEM,EDX and other instruments.The results show that the nickel phosphide has a hollow structure.The electrochemical performance of the study showed that the current charge/discharge specific capacity of Ni 2P nanoparticles was 422.8/644.4 mAh/g when the current density was 54.2 mA/g,and the first charge/discharge ratio of Ni 12 P 5 nanoparticles was 327/604 mAh/g,which indicates that they all have a high charge-discharge ratio capacity,good cycle reversibility,and can be used for a new lithium ion battery anode material.