摘要
以Ni(NO3)2水溶液为电解液,通过电沉积法在泡沫镍基体上原位生长了Ni(OH)2薄膜。采用X-射线衍射、傅里叶变换红外光谱、热重分析和场发射扫描电子显微镜对样品的微观结构进行了分析,发现该样品是具有片状纳米次级结构的α-Ni(OH)2,其内部含有一定量的结晶水和层间阴离子;采用循环伏安、交流阻抗和充放电测试研究了样品的嵌锂性能,结果表明该样品具有很高的嵌锂活性和良好的倍率性能,在50 m A/g充放电电流密度下样品的首次放电比容量为1 435 m Ah/g,第二圈放电比容量为970 m Ah/g,即使是在1 000 m A/g的高电流密度下样品仍具有281.9 m Ah/g的放电比容量。
Nickel hydroxide film was fabricated on nickel foam substrate in Ni （NO3）2 electrolyte by elec- trodeposition method. The microstructure of the prepared sample was analyzed by X-ray diffraction （ XRD）, Fourier transform infrared spectroscopy （ FT-IR）, thermo-gravimetric analysis （ TGA）, and field emission scanning electron microscopy （FESEM）. It revealed that the prepared nickel hydroxide was nano-sized α-Ni （OH） 2 film with sheet-like hierarchical structure. There were many structural water mole- cules and interlayer anions in the α-Ni （OH）2 film. The electrochemical performance of the nano-sized α-Ni （OH）2 film was characterized by cyclic voltammetery （CV）, electrochemical impedance spectrosco- py （EIS）, and charge-discharge test. It demonstrated that the nano-sized α-Ni（OH） 2 film had very high lithium storage capacity and good rate performance. The first and second discharge capacities were up to1435 mAh/g and 970 mAh/g at a constant charge/discharge current density of 50 mA/g. This nano-sized α-Ni （OH）2 film still had a capacity of 281.9 mAh/g even at a very high charge/discharge current densi- ty of 1000 mA/g.
出处
《电镀与精饰》
CAS
北大核心
2015年第3期1-5,19,共6页
Plating & Finishing
基金
国家自然科学基金(No.51204061
No.21263003)
广西自然科学基金(2012jj AA20053
0991247)
广西矿冶与环境科学实验中心科研项目(KH2011ZD005)
关键词
电沉积
纳米α-Ni(OH)2
锂离子电池
负极材料
嵌锂性能
electrodeposition
nano-sized a-nickel hydroxide
lithium-ion batteries
anode materials
lithium storage performances
