摘要
采用氨络合液相共沉淀法 ,同时加入电子导电剂 (石墨粉或乙炔黑细粉 ) ,制备出了掺碳球形Ni(OH) 2 ,对其进行了XRD测试和SEM观察。结果证实电子导电剂被嵌入到球形Ni(OH) 2 颗粒中。将掺碳球形Ni(OH) 2 制备成电极后 ,对其进行了充放电实验。结果表明 ,未添加导电剂时 ,0 2C放电容量为2 70mA·h/g ,中点电位为 30 2mV ,2C放电容量为 2 2 0mA·h/g。添加质量分数为 5 %石墨后 ,0 2C放电容量为 2 5 3mA·h/g ,中点电位为 32 0mV ,2C放电容量为 2 16mA·h/g ;添加质量分数为 5 %乙炔黑后 ,0 2C放电容量为 2 5 8mA·h/g ,中点电位为 32 4mV ,2C放电容量为 2 2 2mA·h/g。随电子导电剂加入量增多 ,则镍电极的放电容量有所减少 ,放电中点电位提高 。
The doped spherical Ni(OH) 2 was prepared by ammonia complexing liquid phase codeposition method, using graphite powder and acetylene black as dopants. XRD and SEM results indicated the intercalation of carbon dopants within the spherical Ni(OH) 2 . The charge discharge experiments showed that for Ni(OH) 2 electrodes without using graphite powder and acetylene black as dopants, the discharging capacity and voltage at plateau were 270 mA·h/g by 0 2C, 220 mA·h/g by 2C and 302 mV, respectively; for electrodes doped with 5 0% graphite, the corresponding values were 253 mA·h/g, 216 mA·h/g and 320 mV, respectively; for electrodes doped with 5 0% acetylene black, the corresponding values were 258 mA·h/g, 222 mA·h/g and 324 mV, respectively. With electronic conductor being increased, the discharge capacity is decreased and the plateau voltage and the discharge ability at high rate are increased.
出处
《应用化学》
CAS
CSCD
北大核心
2003年第6期552-556,共5页
Chinese Journal of Applied Chemistry
基金
天津市自然科学基金资助项目 ( 0 13 60 70 11)
天津市科委攻关项目 ( 973 10 3 711)
