Materials for negative electrodes of lithium ion batteries
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United States of America Patent
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Apr 28, 2009
Grant Date -
Feb 23, 2006
app pub date -
May 25, 2005
filing date -
Aug 17, 2004
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Abstract
The present invention provides materials for negative electrodes of lithium rechargeable batteries. These materials include lithium alloy composites. Each lithium alloy composite has a core-shell structure with one or more lithium alloy granules as its core and a carbon material as its shell. The average granule diameter of the lithium alloy granule is between 5 μm and 40 μm. The average thickness of the shell layer is between 50 Å and 1000 Å. The average diameter of the lithium alloy composite is between 10 μm to 50 μm. The methods of fabrication for the material includes the following steps: stirring lithium alloy granules in an organic solution with a coating substance, drying the solid product in the organic solution with a coating substance, calcining the dried product to obtain the negative electrode material with lithium alloy composites.
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