Process for producing a positive electrode for lithium secondary batteries
CA 2129716 A1 · Owner: Sterr, Gerhard · Inventors: Sterr, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An active material for a positive electrode for lithium secondary batteries and composed of a lithium-manganese oxide (LixMn2O4) with a spinel structure is produced by mixing manganese dioxide with lithium formate (HCOOLi) and/or lithium acetate (CH3COOLi), heating the resulting mixture for 10 to 100 hours preferably at a temperature of from 600°C to 750°C and if, necessary, grinding the heated mixture. The constituents of the mixture contain manganese and lithium in a molar ratio (Mn:Li) of 2:x, where 0.5 < x < 1.5. The resulting product has an extremely fine crystallinity and exhibits good cycling stability.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 8, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.