摘要
采用快速冷冻沉淀法首次成功制备出Fe(Ⅲ)和Al(Ⅲ)复合掺杂非晶态Ni(OH)2粉体材料。通过XRD、SAED、SEM、IR、Raman光谱及DSC-TG等对样品粉体的结构形态进行表征和分析,同时将样品合成电极材料并组装成MH/Ni模拟电池进行电化学性能测试,结果表明,样品材料内部结构缺陷多、无序性强、材料微粒大小比较均匀,并具有较好的分散性,结合水含量较多。将复合掺杂Fe(Ⅲ)5%和Al(Ⅲ)8%的样品材料制备镍正极并组装成MH/Ni模拟电池,在以80 mA·g-1恒流充电5.5 h,40 mA·g-1恒流放电,终止电压1.0 V的充放电制度下,进行充放电性能、比容量及其循环性能等电化学性能的测试,放电平台平稳,工作电压高达1.30 V,放电比容量达到357.6 mAh·g-1,且在电极过程中材料的稳定性增强、电化学阻抗较小,循环可逆性较好。
Amorphous nickel hydroxide powders codoped by Fe（ Ⅲ ） and Al（ Ⅲ ） were prepared by the method of deep freeze deposition. The mierostrueture and morphology of sample were characterized by XRD, SAED, SEM, Raman spectrometry, TG-DSC and IR, and the electrochemical properties were tested by using a simulated MH-Ni battery composed of amorphous nickel hydroxide particles as active material. The results showed many structure defects, uniform size, and a large amount of crystal water. To investigate the effect of codoped Fe（ Ⅲ） and Al（ Ⅲ ） on the electrochemical performance of the samples, simulated batteries with the prepared codoped nickel hydroxide as cathode active material were assembled. When the charging current, discharging current and end potential were respectively 80 mA · g^-1 for 5.5 h, 40 mA · g^-1 and 1.0 V, the specific capacity was 357.6 mA · g^-1 and the sample had longer discharge time at 1.30 V. In addition, the stability and reversibility of the Fe（ Ⅲ ） and Al（ Ⅲ ） eodoped samples were good during the charge/discharge process, and the electrochemical impedance was small.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2009年第3期788-794,共7页
CIESC Journal
基金
国家自然科学基金项目(20563001)
广西科学研究与技术开发计划项目(桂科能05112001-2A1)
广西研究生教育创新人才基地项目(桂学位[2007]18号)
广西研究生教育创新计划项目(2008105960817M21)~~
