Rechargeable lithium cell and process for making an anode for use in the cell
US5545468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Mar 16, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.