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US 2014/0272526 A1Published application
Porous separator for a lithium ion battery and a method of making the same
AssigneeGM Global Technology Operations LLC
InventorXiaosong Huang
Life of this patent
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Abstract
A porous separator for a lithium ion battery is disclosed herein. The porous separator includes a non-woven membrane and a porous polymer coating. The porous polymer coating is formed on a surface of the non-woven membrane, or is infused in pores of the non-woven membrane, or is both formed on the surface of the non-woven membrane and infused in pores of the non-woven membrane.
Claims20
A porous separator for a lithium ion battery, comprising:
- a non-woven membrane;
- and
- a porous polymer coating i) formed on a surface of the non-woven membrane, or ii) infused in pores of the non-woven membrane, or iii) combinations of i and ii.
A lithium ion battery, comprising:
- a positive electrode;
- a negative electrode;
- a porous polymer separator disposed between the positive electrode and the negative electrode, the porous separator including:
- a non-woven membrane;
- and
- a porous polymer coating i) formed on a surface of the non-woven membrane, or ii) infused in pores of the non-woven membrane, or iii) combinations of i and ii.
3 more elements
A method for making a porous separator, the method comprising:
- coating a polymer solution on a non-woven membrane;
- increasing a non-solvent concentration in the polymer solution, thereby inducing phase inversion in the polymer solution and causing a polymer in the polymer solution to precipitate out of the polymer solution;
- and
- removing any of a solvent or a non-solvent of the polymer solution, whereby a porous polymer coating is i) formed on a surface of the non-woven membrane, or ii) infused in pores of the non-woven membrane, or iii) combinations of i and ii.
1 more element
Dependencies are inferred from the claim text.