THE DETERMINATION OF CYANIDE IN THE PRESENCE OF ACETONITRILE DECOMPOSITION PRODUCTS IN LITHIUM/SULPHUR DIOXIDE BATTERIES: CONDITIONS LEADING TO ACETONITRILE DECOMPOSITION. PHASE 3

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Authors
  1. Whyte, J.C.
  2. Jones, S.F.
  3. Anderson, J.S.
Corporate Authors
Farrington Lockwood Co Ltd, Kanata ONT (CAN);Chief of Research and Development, Ottawa ONT (CAN) Air Vehicle Research Section
Abstract
Decomposition of the electrolyte co-solvent, acetonitrile, in Li/SO2 cells has been known for some time. However, interference-free methods for determining the various decomposition products (free cyanide ion, metal-cyanides, thiocyanate ion, other organic compounds) in the Li/SO2 cell matrix have been difficult to develop. The advent of ion/liquid/gas chromatographic techniques with sensitive detection schemes has enable selective detection of these species in the Li/SO2 matrix. Phase 2 of this project involved the adaptation of these chromatographic techniques to the Li/SO2 system. Phase 3 of the project sought to ascertain the conditions of discharge and storage that lead to the decomposition of acetonitrile in the Li/SO2 cell. Many cells (both commercial and custom-built) of both the balanced and Li-rich configuration were analyzed after being subjected to various discharge and storage regimes. It was found that depth and temperature of discharge, temperature and duration of storage after discharge, and initial coulombic balance (Li/SO2 ratio) were factors governing the degree of acetonitrile decomposition. In terms of cyanide formation, initial coulombic balance was found to be the most important variable. Custom cells which were slightly Li-rich (Li/SO2 = 1.1), but still within the balanced cell tolerance (1.0 + or - 0.1), were found to contain significant quantities (@ 100 mg per cell) of free cyanide.
Keywords
Lithium Sulphur Dioxide Batteries;Metal cyanides
Date of publication
01 Jul 1994
Number of Pages
67
DSTKIM No
96-00820
CANDIS No
154316
Format(s):
Document Image stored on Optical Disk;Hardcopy

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