采用快速冷冻沉淀法制备出了非晶态纳米氢氧化镍.对制得材料样品进行了XRD,SEM,TEM,DSC和比表面积与孔径分析,将其制成MH-Ni电池正极材料进行充放电性能测试.结果表明:材料粉体为非晶态,颗粒粒度为纳米级,类似球形.非晶纳米Ni(OH)2的热分解温度286.4℃低于常规球形Ni(OH)2的热分解温度333.8℃,同时具有较大得比表面积和孔径,分别为76.2089 m2·g-1和37.7nm.与普通β-Ni(OH)2相比较,非晶态纳米氢氧化镍电极充电电压低,放电电压平台时间长,且高达1.258V,放电比容量为349.85 mAh/g,具有较好的循环性能,20次循环后其容量衰减仅为1.28%.
The amorphous nano-Ni(OH)2 was synthesized by quick cryoprecipitation. The samples were characterized by XRD, SEM, TEM, DSC, BET surface area and electrochemical testing. The results show that the sample powder synthesized by this method is amorphous, and its shape is similar to spherical with the average particle size of 40 nm. The thermal decomposition temperature of amorphous nano-Ni(OH)2 (286.4 ℃) is lower than that of β-Ni(OH)2 (333.8 ℃), in addition, the nano-Ni(OH)2 has larger specific surface area (76.2089 m2·g-1) and pore size (37.7 nm). Compared with the microsized spherical β-Ni(OH)2, the amorphous nano-Ni(OH)2 exhibits excellent electrochemical performance, such as lower charge voltage, higher discharge platform and better charge-discharge capacity. Also, a maximum capacity of 349.85 mAh·g-1 and the highest discharge voltage of 1.258 V were obtained for this electrode. It also exhibits better cycle performance, and the capacity fading rate is only 1.28% after 20 cycles.
参考文献
| [1] | Ovshinsky S R;Fetcenko M A;Fierro C .[P].US 5523182,1996-6. |
| [2] | Mitsuhiro H;Keiko A;Masafumi M et al.[J].Journal of Power Sources,2004,126:139. |
| [3] | 储炜;吴晖;尤金跨 et al.[J].电源技术,1998,22(06):256. |
| [4] | 刘长久;尚伟;李珍 .[J].稀有金属材料与工程,2005,34(z2):349. |
| [5] | 张红兵,浦坦,李道火.非晶纳米氢氧化镍电极材料的研究[J].电池工业,2004(01):30-32. |
| [6] | 刘长久,叶乃清,黄巧妹,尚伟,刁汉明,朱华平.纳米级β-氢氧化镍和氧化镍掺杂Co（OH）2复合电极的电化学性能[J].桂林工学院学报,2002(02):166-170. |
| [7] | 刘长久,尚伟.电极材料非晶态氢氧化镍的电化学活性[J].稀有金属材料与工程,2006(10):1522-1525. |
| [8] | 韩喜江,徐崇泉,周德瑞,谢小美,马咏丽.纳米β-Ni（OH）2与球型Ni（OH）2的热性能比较研究[J].压电与声光,2002(05):418-420. |
| [9] | K(o)hler U;Antonius C;Peter B(a)uerlein et al.[J].Journal of Power Sources,2004,127:45. |
| [10] | 程风云,唐致远,郭鹤桐.球形Ni（OH）2粒径分布对电化学活性的影响[J].天津大学学报,2000(01):56-58. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%