Methods for fabricating improved graphite granules
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United States of America Patent
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Issued Date -
Nov 18, 2004
app pub date -
Mar 4, 2004
filing date -
May 16, 2003
priority date (Note) -
Abandoned
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Abstract
This invention relates to a method for the fabrication of improved graphite granules from unimproved graphite granules, where a polymer solution is uniformly sprayed onto a fluidized bed of unimproved graphite granules that are being stirred three dimensionally in high speed. The granules are then heat to dry to obtain coated graphite granules. To further improve the electrochemical properties of the final improved graphite granules, the coated graphite granules are immersed in a surface modifier, filtered, heat to dry and sifted. Then, they are solidified and carbonized in an inert environment to obtain final improved graphite granules. This invention is simple, easy to implement, and easy to implement for industrial production. The improved graphite granules made using embodiments of this invention, when used as the material for the negative electrode of a rechargeable battery produces a battery that has high initial charge/discharge efficiency, high reversible specific capacity and good cycle ability.
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