CAJ | 학술논문

在氢氧化镍表面包覆氢氧化镱和氢氧化钴并用XRD、XPS、SEM和恒电流充放电技术进行表征.结果表明:β-Ni(OH)2为六方晶型,Co的存在形式主要为Co2+及有少量的Co3+.样品表面Co和Ni原子比大于8∶1.65℃下0.2、1和3C恒电流充放电时,表面包覆2％Yb(OH)3的样品放电容量和活性物质利用率最大.65℃时经过30次充放电循环后,在不同的充放电倍率下,表面包覆不同量Yb(OH)3的氢氧化镍的放电循环稳定性和放电容量随着Yb(OH)3含量的增加而增大.
재경양화얼표면포복경양화의화경양화고병용XRD、XPS、SEM화항전류충방전기술진행표정.결과표명:β-Ni(OH)2위륙방정형,Co적존재형식주요위Co2+급유소량적Co3+.양품표면Co화Ni원자비대우8∶1.65℃하0.2、1화3C항전류충방전시,표면포복2％Yb(OH)3적양품방전용량화활성물질이용솔최대.65℃시경과30차충방전순배후,재불동적충방전배솔하,표면포복불동량Yb(OH)3적경양화얼적방전순배은정성화방전용량수착Yb(OH)3함량적증가이증대.
The surface of nickel hydroxide [Ni(OH)2] coated with ytterbium hydroxide [Yb(OH)3] and cobalt hydroxide [Co(OH)2]were studied and characterized by XRD,XPS,SEM and constant current recharge technology.The results show that the structure of β-Ni(OH)2 is hexagonal,Co exists mainly in the form of Co2+ with a small amount of Co3+,and the atomic ratio of Co and Ni on the sample surface is more than 8∶1.The samples coated of 2 wt％ Yb(OH)3 show the maximum discharge capacity and active materialutilization rate at 65 ℃ (0.2,1,3 C).After 30 charge/discharge cycles,the discharge cycling stability and the discharge capacity of Ni(OH)2 coated with different contents of Yb (OH)3 are enhanced with increasing of content of Yb(OH)3 under different charge/discharge rates at 65 ℃.