Degradation Reactions in SONY-Type Li-Ion Batteries

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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&deg;C involving the solid electrolyte interface (SEI) layer and the LiPF<sub>6</sub> salt in the electrolyte (EC: PC: DEC/LiPF<sub>6</sub>). These reactions could account for the thermal runaway observed in these cells beginning at 100&deg;C. Exothermic reactions were also observed in the 200&deg;C-300&deg;C region between the intercalated lithium anodes, the LiPF<sub>6</sub> salt and ... continued below

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6 Pages

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Nagasubramanian, G. & Roth, E. Peter May 4, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
    Place of Publication: Albuquerque, New Mexico

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Description

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&deg;C involving the solid electrolyte interface (SEI) layer and the LiPF<sub>6</sub> salt in the electrolyte (EC: PC: DEC/LiPF<sub>6</sub>). These reactions could account for the thermal runaway observed in these cells beginning at 100&deg;C. Exothermic reactions were also observed in the 200&deg;C-300&deg;C region between the intercalated lithium anodes, the LiPF<sub>6</sub> salt and the PVDF. These reactions were followed by a high- temperature reaction region, 300&deg;C-400&deg;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 medhun. Cathode exotherrnic reactions with the PVDF binder were observed above 200oC and increased with the state of charge (decreasing Li content). This offers an explanation for the observed lower thermal runaway temperatures for charged cells.

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6 Pages

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  • 1999 Spring Meeting of the Material Research Society; San Francisco, CA; 04/05-09/1999

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  • Other: DE00007233
  • Report No.: SAND99-1116C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 7233
  • Archival Resource Key: ark:/67531/metadc707362

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  • May 4, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 23, 2016, 12:37 p.m.

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Nagasubramanian, G. & Roth, E. Peter. Degradation Reactions in SONY-Type Li-Ion Batteries, article, May 4, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc707362/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.