Accession Number : ADA116789

Title :   Thermal Decomposition of Dimethoxymethane Electrolyte Solution.

Descriptive Note : Technical rept.,

Corporate Author : EIC LABS INC NEWTON MA

Personal Author(s) : Foos,J S ; Meltz,V

PDF Url : ADA116789

Report Date : Jun 1982

Pagination or Media Count : 20

Abstract : The electrolyte solution prepared from LiAsF6 and dimethoxymethane (DMM) has been investigated for use in secondary lithium batteries. Storage tests were conducted at 70 C. In the presence of Li the best samples of electrolyte were stable to Li for more than one month. In the absence of Li, the electrolyte solution decomposed within days with loss of DMM, and formation of methyl formate and dimethyl ether in a 1:2 ratio. The products were identified and product ratio determined using IR and proton NMR spectroscopy. A chain reaction mechanism is proposed for the decomposition which postulates oxygen-stabilized carbocation intermediates. Because the reaction may be impurity initiated and is quenched by Li metal, the importance of purification and storage of electrolyte with Li, is emphasized. (Author)

Descriptors :   *Storage batteries, *Lithium, *Electrolytes, *Decomposition, Pyrolysis, Aldehydes, Methanes, Lithium compounds, Arsenic compounds, Fluorides, Solutions(Mixtures)

Subject Categories : Physical Chemistry
      Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE