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Titre du document / Document title

Effects of overdischarge on performance and thermal stability of a Li-ion cell

Auteur(s) / Author(s)

MALEKI Hossein (1) ; HOWARD Jason N. (1) ;

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

(1) Motorola Mobile Devices, 1700 Bell Meade Ct, Lawrenceville, GA 30043, ETATS-UNIS

Résumé / Abstract

Overdischarge effects on cycle-life and thermal stability of a commercially available Li-ion cell (rated at 780 mAh) were investigated. Cells were overdischarged and kept at 2.0, 1.5, 1.0, 0.5 or 0.0 V for 72 h (3 days) and then cycled five times (discharge to 3.0 V at 0.4 A and charged to 4.2 V at 0.8 A). This process was repeated five times. The cells overdischarged between 2.0 and 0.5 V experienced irreversible capacity losses of 2-16%. The same cells lost between 8 and 26% more capacity after they were cycled 100 times between 4.2 and 3.0 V at 0.8 A. Behavior of the cells overdischarged to 0.0 V was unpredictable. Some cells lost nearly 65 % of their initial capacities after 15 days of being kept at 0.0 V, and others failed in different stages of overdischarging to 0.0 V. Overdischarging to 0.5 V had minimal effects on thermal stability, overcharge performance and a.c. impedance, but led to considerable swelling of the cells. Overdischarge to 0.0 V caused cell thickness and a.c. impedance to increase by ∼70 and 250% of their initial values, respectively. This article addresses concerns that overdischarging of Li-ion cells below 1.5 V may cause capacity losses and/or thermal stability changes which could impact tolerance to abuse conditions.

Revue / Journal Title

Journal of power sources    ISSN  0378-7753   CODEN JPSODZ 

Source / Source

2006, vol. 160, no2, pp. 1395-1402 [8 page(s) (article)] (14 ref.)

Langue / Language

Anglais

Editeur / Publisher

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

Mots-clés anglais / English Keywords

Electrochemical cell

;

Lifetime

;

Impedance

;

Service life

;

Lithium ion

;

Thermal stability

;

Performance

;

Mots-clés français / French Keywords

Pile électrochimique

;

Durée vie

;

Impédance

;

Durée service

;

Lithium ion

;

Stabilité thermique

;

Performance

;

Mots-clés espagnols / Spanish Keywords

Pila electroquímica

;

Tiempo vida

;

Impedancia

;

Duración servicio

;

Litio ión

;

Estabilidad térmica

;

Rendimiento

;

Mots-clés d'auteur / Author Keywords

Lithium-ion cells

;

Overdischarge

;

Overcharge

;

Thermal stability and impedance

;

Localisation / Location

INIST-CNRS, Cote INIST : 17113, 35400015968200.0820

Nº notice refdoc (ud4) : 18401298



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