摘要
为了改善铝代α—Ni(OH)2的电化学性能,用共沉淀法合成了含不同配比Al^2+、Co^2+的Ni(OH)2.样品经CT、XRD、FTIR、SEM等表征为α-Ni0.8CoxAl0.2-x(OH)2.2-0.5y(CO3)y·zH2O.恒电流充放电和微电极CV等测试表明:Co^2+的摩尔分数在0.02~0.04时,合成的样品作为氢镍电池的正极材料,在放电比容量、电极可逆性和稳定性等方面均得到改善.Co^3+发挥了稳定α相结构、增强导电性等多重作用.
In order to improve the electrochemical performances of Al^3+-doped α-Ni(OH)2 ,the Al^3+/Co^3+-doped α-Ni(OH)2 were synthesized by co-precipitation. The samples were determined as α-Ni0.8CoxAl0.2-x(OH)2.2-0.5y(CO3)y·zH2O by CT, XRD,FTIR, SEM. Furthermore, it was found that the α-Ni0.8CoxAl0.2-x(OH)2.2-0.5y(CO3)y·zH2O(x = 0.02 - 0.04) electrode had higher discharge specific capacity, reversibility and stability according to the constant current charge-discharge and mieroelectrode CV test. The multiple function of Co^3+ had fully been displayed in enhancing the conductivity and a-phase structure stability.
出处
《厦门大学学报(自然科学版)》
CAS
CSCD
北大核心
2010年第2期228-232,共5页
Journal of Xiamen University:Natural Science
基金
福建省教育厅科研基金(JB08247)