Silica electrolyte element for secondary lithium battery

H - Electricity – 01 – M

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H01M 10/40 (2006.01) H01M 2/16 (2006.01) H01M 10/26 (2006.01)

Patent

CA 2124321

A film of linear organosilsesquioxane polymer, or "ladder" organosiloxane, coated upon the surface of an LiMn2O4 secondary battery electrode (19) and cured to a glassy layer is subjected to plasma oxidation to remove pendant organic groups comprising the coated polymer. The resulting ultrathin silica separator layer (17) is replete with minute pores which take up and retain by capillarity a typical LiCIO4 electrolyte solution. A counter-electrode (15) placed in intimate contact with the silica electrolyte element completes a secondary battery structure (10) in which lithium ions readily migrate through the electrolyte during repeated discharge/charge cycles without loss of element integrity or efficacy.

ne pellicule de polymère d'organosilsesquioxane linéaire, ou organosiloxane en « échelle », dont la surface est revêtue d'une électrode (19) d'accumulateur électrique au LiMn2O4 et durcie en une couche vitreuse est soumise à une oxydation par plasma pour éliminer les groupes organiques pendants constituant le polymère enrobé. La couche séparatrice de silice ultramince qui en résulte (17) est couverte de pores très fins qui absorbent et retiennent par capillarité une solution électrolytique typique de LiCIO4. Une contre-électrode (15) placée en étroit contact avec l'élément électrolytique de silice vient compléter la structure de l'accumulateur électrique (10) dans laquelle les ions lithium migrent librement à travers l'électrolyte durant les cycles répétés de charge-décharge sans perte d'efficacité ni d'intégrité de l'élément.

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