Separator for lithium ion secondary battery

H - Electricity – 01 – M

Patent

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Details

H01M 2/14 (2006.01) H01M 2/16 (2006.01) H01M 10/24 (2006.01)

Patent

CA 2425750

A separator, used for a lithium ion secondary battery that produces electromotive force by lithium doping/dedoping, which is composed of a porous film comprising an organic polymer (component A) which can swell in an electrolyte solution to retain it, surrounding a nonwoven fabric which cannot swell in the electrolyte solution, the porous film including an electrolyte solution non-swelling organic polymer with a melting point of 210°C or above (component B) and an electrolyte solution non-swelling organic polymer with a melting point of 180°C or below (component C), wherein component B is incorporated in the fiber composing the nonwoven fabric. The separator is highly safe and exhibits low reduction in mechanical properties with respect to organic solvents.

Séparateur pour batterie secondaire au lithium-ion, qui produit une force électromotrice par le dopage/dédopage du lithium, qui est composé d'un film poreux comprenant un polymère organique (élément A), qui peut gonfler dans une solution d'électrolyte pour le retenir, entourant un tissu non tissé qui ne peut gonfler dans la solution d'électrolyte, le film poreux comprenant un polymère organique ne gonflant pas en solution d'électrolyte, avec un point de fusion égal ou supérieur à 210 oC ou plus (élément B), et un polymère organique ne gonflant pas en solution d'électrolyte avec un point de fusion égal ou inférieur à 180 oC (élément C), où l'élément B est incorporé à la fibre qui compose le tissu non tissé. Le séparateur a un niveau de sûreté élevé et démontre une faible réduction de ses propriétés mécaniques par rapport à des solvants organiques.

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