Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1992-11-12
1994-09-06
Higel, Floyd D.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429 94, 429101, 420580, H01M 432, H01M 436, H01M 448, H01M 452, H01M 456
Patent
active
053447280
ABSTRACT:
A positive electrode for use in alkaline rechargeable electrochemical cells comprising: a material comprising a compositionally and structurally disordered multiphase nickel hydroxide host matrix which includes at least one modifier chosen from the group consisting of F, Li, Na, K, Mg, Ba, Ln, Se, Nd, Pr, Y, Co, Zn, Al, Cr, Mn, Fe, Cu, Zn, Sc, Sn, Sb, Te, Bi, Ru, and Pb. A process for forming a high loading uniformly distributed multiphase substantially nitrate free sintered positive electrode for use in an alkaline rechargeable electrochemical cell, the process comprising: (1) fabricating sintered electrode material by forming a slurry of nickel powder, water, carboxy methyl cellulose binder, methyl cellulose binder, and a poly(ethylene oxide) polymer; spreading the slurry on a preoxidized perforated nickel substrate; drying the slurry; and sintering the slurry; (2) impregnating the sintered electrode material using multiple impregnation cycles to attain high loading, where each impregnation cycle comprises the steps of: placing the sintered electrode material on a rack; dipping the rack into nickel nitrate; allowing the rack to drip dry; dipping the dried rack into NaOH solution; spraying the rack in a first tank with deionized water overflowing from a second tank; dipping the rack in the second tank filled with deionized water overflowing from a third tank; dipping the rack in the third tank filling with deionized water at a rate of 8-10 gpm; drying the rack; and flipping the rack to attain uniform deposition of material; where in the median dip cycle and in the final dip cycle of the multiple impregnation cycles, the step of dipping the rack into nickel nitrate is replaced by a step of dipping the rack into cobalt nitrate to produce an enriched cobalt surface; and (3) forming the impregnated sinter into positive electrode material by presoaking the impregnated sinter in NaOH presoak tanks to substantially eliminate nitrates; brushing the presoaked impregnated sinter in a surface brushing station; charging the brushed impregnated sinter; discharging the charged impregnated sinter; rinsing the discharged impregnated sinter; and drying the rinsed impregnated sinter to complete the formation of positive electrode material.
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Fetcenko Michael A.
Holland Arthur
Ovshinsky Stanford R.
Venkatesan Srinivasan
Higel Floyd D.
Luddy Marc J.
Ovonic Battery Company Inc.
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