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US 5,667,660 AGranted
Synthesis of charged Li.sub.x CoO.sub.2 (0<.times.<1) for primary and secondary batteries
AssigneeAlliant Techsystems Inc.
InventorsHsiu-Ping W. Lin, Kevin Burgess
Life of this patent
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Abstract
A method for producing stable pre-charged Li.sub.x CoO.sub.2 as the cathode active metal in primary or secondary active metal non-aqueous cells and cells using such material are disclosed.
Claims13
A method of preparing a cathode incorporating heat stabilized charged Li.sub.x CoO.sub.2 as the cathode active material comprising the steps of:
- (a) preparing the cathode active material by;
- (1) providing a layer of particulate Li.sub.x CoO.sub.2 on a metallic current collector,
- (2) subjecting the Li.sub.x CoO.sub.2 on said current collector to a charging current voltage to plate out Li and produce charged Li.sub.x CoO.sub.2 (0<x<1), and
- (3) separating the charged particulate material from said current collector;
- and
- (b) incorporating said particulate cathode active material in the cathode.
3 more elements
A method of preparing a cathode containing heat stabilized, charged Li.sub.x CoO.sub.2 (0<x<1) as the active material comprising the steps of:
- (a) preparing the active material by;
- (1) creating a layer of powdered Li.sub.x CoO.sub.2 from a solvent slurry thereof on a metallic collector grid,
- (2) sandwiching the collector grid between a pair of lithium members separated by semipermeable separator membranes to form a three-plate stack,
- (3) confining the three-plate stack cell in a gas-tight environment,
- (4) providing electrolyte to the three-plate stack;
- (5) charging the cell using externally supplied power until an amount of charge corresponding to a value of x, where 0<x<1 is achieved, and
- (6) separating the charged particulate material from said collector grid;
- and
- (b) combining said separated charged particulate Li.sub.x CoO.sub.2 material into a cathode mix for application to a current collector for use in a non-aqueous electrochemical cell.
6 more elements
Dependencies are inferred from the claim text.