α-Ni_(0.8)Co_xAl_(0.2-x)(OH)_(2.2-0.5y)(CO_3)_y·zH_2O配位沉淀法合成和电化学性能

Studies on Co-precipitation Synthesis andElectrochemical Performances of α-Ni_(0.8)Co_xAl_(0.2-x)(OH)_(2.2-0.5y)(CO_3)_y·zH_2O

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.