Cathode materials comprising rhombohedral nasicon for secondary (rechargeable) lithium batteries
CA 2755356 C · Owner: Hydro-Quebec · Inventors: Nanjundaswamy, K. S.; Padhi, Akshaya; Masquelier, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of preparing LiFePO4 having an olivine structure comprising: mixing stoichiometric proportions of a source of lithium a source of iron, and a source of phosphorus to form a source mixture; heating the source mixture to a temperature and for a period of time sufficient to allow a solid--state reaction to occur so as to form LiFePO4 having an olivine structure. The invention also relates to a method of preparing a delithiated olivine FePO4 compound comprising: mixing stoichiometric proportions of a source of lithium a source of iron, and a source of phosphorus to form a source mixture; heating the source mixture to a temperature and for a period of time …
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 April 23, 1997 and granted April 16, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2019.
- 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.