Preparation of carbon electrodes by polymer-precipitation
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United States of America Patent
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Sep 24, 1996
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N/A
app pub date -
Oct 13, 1994
filing date -
Oct 13, 1994
priority date (Note) -
Expired
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Abstract
The present invention provides a method of preparing carbon electrodes for use in electrochemical energy storage cells such as lithium ion batteries. The process involves a step of precipitating a polymer from a concentrated solution to yield a structure having at least a partially fractious morphology. The solvent from which the polymer has been precipitated (the 'primary solvent') is then exchanged with another solvent (the 'secondary solvent') in which the polymer is relatively insoluble. Thereafter, the secondary solvent is removed from the precipitated polymer and the dry polymer is contacted with a dopant such as phosphorous. Subsequently, the polymer with dopant is pyrolyzed to yield a carbon material which is assembled into an electrode.
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