Preparation and properties of no-binder electrode Ni/MH battery

Generally, while the electrodes of an Ni/MH battery are manufactured, binders are universally used. Although the binder can improve the strength of the electrodes and the durability of the battery, the disadvantages are obvious: higher internal resistance and polarization when the battery is being c...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 293; pp. 780 - 783
Main Authors Yan, Deyi, Cui, Weiguo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 20.12.1999
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Summary:Generally, while the electrodes of an Ni/MH battery are manufactured, binders are universally used. Although the binder can improve the strength of the electrodes and the durability of the battery, the disadvantages are obvious: higher internal resistance and polarization when the battery is being charged and discharged, lower discharge capacity, higher internal pressure and longer activation time. So the amount of binders should be controlled to a low level. Our investigations show that it is more advantageous to abandon binders while manufacturing electrodes. The bare active particles are more available to the electrochemical reaction in the positive and negative electrodes. In this study no-binder electrodes were prepared by smearing active materials into the nickel foam and then high-pressure rolling. The properties of the battery assembled by these electrodes were improved significantly. For example, for the first activation cycle the discharge capacity of a type-AA battery reached 1400 mAh. The discharge capacity at 1C was above 1300 mAh and the portion of plateau above 1.2 V during discharging was more than 70%. Its durability was more than 500 cycles.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(99)00462-4