Rechargeable lithium cell and process for making an anode for use in the cell
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United States of America Patent
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Aug 13, 1996
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N/A
app pub date -
Mar 16, 1994
filing date -
Mar 17, 1993
priority date (Note) -
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Abstract
A rechargeable lithium cell comprises a cathode having a discharge potential not less than 2 V relative to a Li/Li.sup.+ anode, an anode capable of doping and un-doping lithium and made of a material comprising a lithium titanate having a spinel structure and represented by the general formula, LixTiyO.sub.4 wherein 0.8.ltoreq.x.ltoreq.1.4 and 1.6.ltoreq.y.ltoreq.2.2, a separator separating the cathode and the anode from each other, and an electrolytic solution impregnated at least in the separator and dissolving a lithium salt in a non-aqueous solvent. When subjected to X-ray diffraction analysis, the material has peaks at least at 4.84.+-.0.02 angstroms, 2.53.+-.0.02 angstroms, 2.09.+-.0.02 angstroms and 1.48.+-.0.02 angstroms and a ratio of a peak intensity at 4.84.+-.0.02 angstroms and a peak intensity at 1.48.+-.0.02 angstroms of 100:30.+-.10. The material may consist of the lithium titanate or mixed crystals of the lithium titanate and rutile-type titanium dioxide. A process for making the anode is also described.
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