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Effect of Additive and Binder on the Properties of Metal-Hydride Electrode

Author: YeDeLong
Tutor: ZuoKangPing
School: Sichuan University
Course: Chemical Process Equipment
Keywords: Ni-MH battery Negative electrode Additive Bonding material
CLC: TM911
Type: Master's thesis
Year: 2001
Downloads: 298
Quote: 4
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Abstract


NiMH batteries are the third generation practical rechargeable battery . Nickel strip to punching matrix pull pulp manufacture nickel-metal hydride battery anode has a low cost , easy to implement continuous production advantages . Pull slurry negative electrode must have a certain amount of the additive and the binder material , which has a significant impact on the battery performance . In this paper, on the basis of a detailed overview of additives and binder material of the situation , facing the engineering applications , using a working electrode in the opening of the battery way to study the impact on the performance of the negative electrode of nickel metal hydride batteries of the additive and the binder material . Ultrafine nickel powder , copper powder , nickel fibers , acetylene black , and CoO additives affect the the negative electrochemical properties of nickel-metal hydride battery . The results show that : the copper powder , nickel fibers are not suitable for use as a nickel hydrogen battery cathode additives . 10% to 15 % of the ultrafine nickel powder , 0.7% of acetylene black and 2 % of CoO can be used alone as the additive of the negative electrode of nickel metal hydride batteries . The quality than capacity , acetylene black highest negative additive ultrafine nickel powder T210, T255 additives lowest . The volume ratio of capacity , CoO as additives highest negative electrode , and acetylene black as the minimum of additives . The reason for causing the above results in that the differences in their conductivity , electro-catalytic properties and bulk density . CoO added in an amount between 4% and 6 % of the negative electrode in the initial cycle micro short circuit caused due to the formation of cobalt bridge \self-discharge . Polytetrafluoroethylene, polyvinyl alcohol, natural rubber latex adhesive , a negative electrode molding process and electrochemical performance . The results show that : With regard to the forming process in terms of PTFE bonded anode poor ; the PVA adhesive negative electrode was dried at room temperature to have good molding process , while above 60 ℃ dried poorly; negative electrode of natural rubber latex adhesive at room temperature and 85 ℃ drying have good molding process . The purpose of electrochemical properties of the latex adhesive negative electrochemical properties , PTFE bonded negative PVA adhesive negative better than the first two .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells
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