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US 10,950,836 B2Granted
Separators for lithium-containing electrochemical cells and methods of making the same
AssigneeGM Global Technology Operations LLC
InventorsXingcheng Xiao, Mei Cai, Gongshin Qi
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Abstract
A porous separator for a lithium-containing electrochemical cell is provided herein. The porous separator includes a porous substrate and an active layer comprising lithium ion-exchanged zeolite particles. Methods of manufacturing the porous separator and lithium-containing electrochemical cells including the porous separator are also provided herein.
Claims13
A porous separator for a lithium-containing electrochemical cell comprising:
- a porous substrate having a first side and an opposing second side;
- and
- an active layer comprising a mixture of lithium ion-exchanged zeolite particles and a polymeric binder, wherein the lithium ion-exchanged zeolite particles have:
- (i) an average pore size diameter of less than or equal to about 1 nm;
- (ii) an average particle diameter of less than or equal to about 20 μm;
- (iii) lithium cations present in an amount greater than or equal to about 90 at. % of extra-framework cations in the lithium ion-exchanged zeolite particles;
- and
- (iv) less than or equal to about 5 at. % of one or more of the following cations:
- Na+, K+, Mg2+, Ca+, H+, and NH4+;
- wherein the active layer is present on both the first and second sides of the porous substrate, and the active layer has a thickness of less than or equal to about 20 μm.
7 more elements
A lithium-containing electrochemical cell comprising:
- a negative electrode layer;
- a positive electrode layer spaced apart from the negative electrode layer:
- a porous separator disposed between confronting surfaces of the negative electrode layer and the positive electrode layer, wherein the porous separator comprises:
- a porous substrate having a first side and an opposing second side;
- and
- an active layer comprising a mixture of lithium ion-exchanged zeolite particles and a polymeric binder, wherein the lithium ion-exchanged zeolite particles have:
- (i) an average pore size diameter of less than or equal to about 1 nm;
- (ii) an average particle diameter of less than or equal to about 20 μm;
- (iii) lithium cations present in an amount greater than or equal to about 95 at. % of extra-framework cations in the lithium ion-exchanged zeolite particles;
- and
- (iv) less than or equal to about 1 at. % of one or more of the following cations:
- Na+, K+, Mg2+, Ca+, H+, and NH4+;
- wherein the active layer is present on both the first and second sides of the porous substrate, and the active layer has a thickness of less than or equal to about 20 μm;
- and
- a liquid electrolyte infiltrating the negative electrode layer, the positive electrode layer, and the porous separator.
12 more elements
Dependencies are inferred from the claim text.