金属Ni和NiO纳米颗粒复合结构的制备与储锂性能

Preparation of Ni and NiO nanoparticle composite structure and study on lithium storage performance

以C4H6O4Ni·4H2O和Ni(NO3)2·6H2O为原料,分别在空气气氛下低温热解制备了金属Ni和NiO纳米颗粒复合结构(Ni@NiO)和NiO.利用XRD,SEM,循环伏安法和恒电流充放电法表征了两种样品的微观结构与电化学性能.结果表明,两种材料都含有晶体NiO.Ni@NiO是由粒径20~110 nm的球形颗粒堆积而成,而NiO是由不规则微米颗粒构成.Ni@NiO储锂性能更好,当电压为0~3 V、电流为0.1 A/g时,Ni@NiO的首次充电比容量高达827.7 mAh/g,首次库伦效率为77.1%.

Ni and NiO nanocomposite(Ni@NiO)as well as NiO were prepared by low temperature pyrolysis in air atmosphere using C4H6O4Ni·4H2O and Ni(NO3)2·6H2O as raw materials.The microstructure and electrochemical properties of the two samples were characterized by XRD,SEM,cyclic voltammetry and galvanostatic charge-discharge method.Results from the characterizations show that both materials contain NiO crystals.Ni@NiO is formed by stacking spherical particles with a particle size of 20~110 nm,and NiO is composed of irregular micro-particles.Ni@NiO has better lithium storage performance.When the voltage keeps a range of 0~3 V and the current keeps a range of 0.1 A/g,the first charge specific capacity of Ni@NiO reaches as high as 827.7 mAh/g,and the first coulomb efficiency becomes 77.1%as a consequence.