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Effects of Ultrasonic Treatment on the Structure and Electrochemical Performances of Spherical β ‐Ni(OH) 2
Author(s) -
Zhou HuanBo,
Zhou ZhenTao
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690019
Subject(s) - chemistry , electrochemistry , dielectric spectroscopy , crystallite , nickel , diffusion , ultrasonic sensor , electrode , hydroxide , analytical chemistry (journal) , particle size , cyclic voltammetry , inorganic chemistry , crystallography , thermodynamics , organic chemistry , physics , acoustics
A method of ultrasonic treatment (UST) was first used to modify the structure and electrochemical performance of nickel hydroxide for the active material of nickel series alkaline batteries. The experimental results showed that UST was an effective method to improve the electrochemical performance of β ‐Ni(OH) 2 such as specific discharge capacity, discharge potential, electrochemical reversibility and oxygen evolution over‐potential. The results of electrochemical impedance spectroscopy, powder X‐ray diffraction and particle size distribution indicated that the improvement of the performance of β ‐Ni(OH) 2 through UST was attributed to the reduction of the charge‐transfer resistance ( R t ) and the diffusion impedance ( Z w ), which resulted from the decrease of the crystallite and particle size and the increase of interlayer spacing. Diffusion coefficient of proton D H of ultrasonic treated β ‐Ni(OH) 2 gained by CV tests was 1.13×10 −11 cm 2 /s, and the average discharge specific capacity of ultrasonic treated β ‐Ni(OH) 2 electrode was 301 mAh/g.