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Titre du document / Document title

Phosphoric acid as an electrolyte additive for lead/acid batteries in electric-vehicle applications

Auteur(s) / Author(s)

MEISSNER E. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) VARTA Batterie AG, R& D Centre, 65779 Kelkheim, ALLEMAGNE

Résumé / Abstract

The influence of the addition of phosphoric acid to the electrolyte on the performance of gelled lead/acid electric-vehicle batteries is investigated. This additive reduces the reversible capacity decay of the positive electrode significantly which is observed upon extended cycling when recharge of the battery is performed at low initial rate. This is important when low-rate on-board chargers are used. Pulsed discharge, typical for electric-vehicle application, induces reversible capacity decay more than constant-current discharge at a same depth-of-discharge, as well with as without the addition of phosphoric acid. By contrast, hindrance in presence of H3PO4 for both the recharge and the discharge reaction helps to homogenize the state of many individual cells during cycling in long battery strings. Reversible capacity loss, which occurs after extended cycling and when pulsed discharge is applied, can be recovered by a single discharge at very low rate with batteries with and without the addition of phosphoric acid. The discharge-rate dependency of the capacity is significantly reduced when phosphoric acid is added. The pulse discharge behaviour may be better, even if the nominal capacity is reduced. The experimental findings of the influence of phosphoric acid addition is discussed in terms of the aggregate-of-spheres model of reversible capacity decay.

Revue / Journal Title

Journal of power sources    ISSN  0378-7753   CODEN JPSODZ 

Source / Source

Congrès
European Lead Battery Conference (ELBC) No5, Barcelona , ESPAGNE (02/10/1996)
1997, vol. 67, no 1-2 (328 p.)  (78 ref.), pp. 135-150

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1976) (Revue)

Mots-clés anglais / English Keywords

Secondary batteries

;

Lead battery

;

Electric vehicles

;

Electrolytes

;

Addition

;

Phosphoric acid

;

Cycling

;

Pulse behavior

;

Pulsed discharge

;

Recovery

;

Ampere hour capacity

;

Mots-clés français / French Keywords

Batterie accumulateur électrochimique

;

Accumulateur plomb

;

Véhicule électrique

;

Electrolyte

;

Addition

;

Phosphorique acide

;

Cyclage

;

Régime impulsionnel

;

Décharge impulsionnelle

;

Récupération

;

Capacité quantité électricité

;

Mots-clés espagnols / Spanish Keywords

Acumulador plomo

;

Adicción

;

Ciclaje

;

Régimen impulsional

;

Descarga impulsional

;

Localisation / Location

INIST-CNRS, Cote INIST : 17113, 35400006990858.0170

Nº notice refdoc (ud4) : 2060325



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