关键词:

α-Ni(OH)₂, La和Zn复合掺杂, 电化学性能

Abstract:

The rare metal La and Zn codoped α-nickel hydroxide was prepared by the urea precipitation method.The microstructure and composition of the sample were characterized by XRD, EDS, IR and TG-DSC.The electrochemical properties were also investigated when the sample codoped with La and Zn was made as the nickel electrode active material, and the MH-Ni battery was assembled.The results showed that the sample had a relatively larger interlayer distance and contained many structurally bonded water molecules, and the electrochemical reaction impedance was reduced.At 0.1 C charge-discharge rate, the discharge specific capacity reached 372.85 mAh·g^-1 when the end potential was 1.0 V, simultaneously its discharge mediate potential was higher and maintained at 1.30 V.In addition, the discharge specific capacity of the sample could reach 344.07 mAh·g^-1 at 1 C rate, and the capacity still remained 93.04% of the sample after 30 cycles.It demonstrated better high-rate discharge performance,and increased cycling and structural stability.

Key words:

α-Ni(OH)₂, La和Zn复合掺杂, 电化学性能