Porous polybenzimidazole as separator for lithium ion batteries
AssigneeCouncil of Scientific and Industrial Research
InventorsVikas Kumar, Swaminathan Sivaram, Ver Avadhani Chilukuri
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Abstract
The present invention discloses a film comprising porous, amorphous polybenzimidazole (PBI) and at least one filler for use as a separator in a lithium ion battery and a process for preparation thereof.
Claims11
A porous film comprising amorphous polybenzimidazole and at least one filler for use as a separator in a lithium ion battery, wherein the amount of filler is in the range of 0.5 wt % to 5.0 wt % of the amorphous polybenzimidazole, wherein said filler consists of silica, calcium carbonate, or a combination thereof, wherein the porous film has a melt integrity up to a temperature of 375° C., and wherein the porous film is standalone and is free of a coating and a support.
A process for manufacturing a porous film for use as a separator in a lithium ion battery, the process comprising:
- (a) preparing a polybenzimidazole solution in a solvent followed by heating the polybenzimidazole solution to a temperature ranging from 90° C. to 100° C. and stirring for a time ranging from 16-20 h;
- (b) adding a filler into the polybenzimidazole solution of step (a);
- and
- (c) casting a resultant solution on a glass plate to afford the porous film,
- wherein the porous film comprises amorphous polybenzimidazole and the filler,
- wherein the filler consists of silica, calcium carbonate, or a combination thereof,
- wherein an amount of the filler in the porous film is in the range of 0.5 wt % to 5.0 wt % of the amorphous polybenzimidazole,
- wherein the porous film has a melt integrity up to a temperature of 375° C., and
- wherein the porous film is standalone and is free of a coating and a support.
Dependencies are inferred from the claim text.