Rechargeable lithium cell and process for making an anode for use in the cell
First Claim
1. A rechargeable lithium cell which comprises a cathode which has a discharge potential not less than 2 V relative to a Li/Li+ anode, an anode capable of doping and un-doping lithium comprising a lithium titanate which has a spinel structure and is a final product having the general formula, Lix Tiy O4, wherein 0.8≦
- x≦
1.4 and 1.6≦
y≦
2.2, a separator separating the cathode and the anode from each other, and an electrolytic solution impregnated at least in the separator and containing a lithium salt dissolved in a non-aqueous solvent, wherein when subject to X-ray diffraction analysis using a Cu target, said reaction product has diffraction 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.
1 Assignment
0 Petitions
Accused Products
Abstract
A rechargeable lithium cell comprises a cathode having a discharge potential not less than 2 V relative to a Li/Li+ 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, LixTiyO4 wherein 0.8≦x≦1.4 and 1.6≦y≦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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Citations
13 Claims
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1. A rechargeable lithium cell which comprises a cathode which has a discharge potential not less than 2 V relative to a Li/Li+ anode, an anode capable of doping and un-doping lithium comprising a lithium titanate which has a spinel structure and is a final product having the general formula, Lix Tiy O4, wherein 0.8≦
- x≦
1.4 and 1.6≦
y≦
2.2, a separator separating the cathode and the anode from each other, and an electrolytic solution impregnated at least in the separator and containing a lithium salt dissolved in a non-aqueous solvent, wherein when subject to X-ray diffraction analysis using a Cu target, said reaction product has diffraction 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. - View Dependent Claims (2, 3, 4, 5, 6)
- x≦
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7. A rechargeable lithium cell which comprises:
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a cathode which has a discharge potential not less than 2 V relative to a Li/Li+ anode; an anode capable of doping and un-doping lithium comprising mixed crystals of a lithium titanate which has a spinel structure and is a final product having the general formula, Lix Tiy O4, wherein 0.8≦
x≦
1.4 and 1.6≦
y≦
2.2 and rutile form of titanium dioxide;a separator separating the cathode and the anode from each other; and an electrolytic solution impregnated at least in the separator and containing a lithium salt dissolved in a non-aqueous solvent, wherein when subjected to X-ray diffraction analysis using a Cu target, said final product has diffraction peaks at least at 4.84±
0.02 angstroms, 3.25±
0.02 angstroms, 2.53±
0.02 angstroms, 2.49±
0.02 angstroms, 2.19±
0.02 angstroms, 2.09±
0.02 angstroms, 1.69±
0.02 angstroms, and 1.48±
0.02 angstroms. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification