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Degradation Reactions in SONY-Type Li-Ion Batteries

Published online by Cambridge University Press:  10 February 2011

E. Peter Roth  and
G. Nagasubramanian
E. Peter Roth
Affiliation:
Sandia National Laboratories, PO Box 5800 MS0613, Albuquerque, NM 87185
G. Nagasubramanian
Affiliation:
Sandia National Laboratories, PO Box 5800 MS0613, Albuquerque, NM 87185
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Abstract

Thermal instabilities were identified in SONY-type lithium-ion cells and correlated with interactions of cell constituents and reaction products. Three temperature regions of interaction were identified and associated with the state of charge (degree of Li intercalation) of the cell. Anodes were shown to undergo exothermic reactions as low as 100°C involving the solid electrolyte interface (SEI) layer and the LiPF6 salt in the electrolyte (EC:PC:DEC/LiPF6). These reactions could account for the thermal runaway observed in these cells beginning at 100°C. Exothermic reactions were also observed in the 200°C-300°C region between the intercalated lithium anodes, the LiPF6 salt, and the PVDF. These reactions were followed by a hightemperature reaction region, 300°C-400°C, also involving the PVDF binder and the intercalated lithium anodes. The solvent was not directly involved in these reactions but served as a moderator and transport medium. Cathode exothermic reactions with the PVDF binder were observed above 200°C and increased with the state of charge (decreasing Li content). This offers an explanation for the observed lower thermal runaway temperatures for charged cells.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 143
Copyright
Copyright © Materials Research Society 2000

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References

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