Dielectric thin films with PI mixed slurry layers for use in solid-state and solid-like batteries

Abstract

A dielectric film having a PI mixed slurry layer for use in solid-state and solid-state-like batteries, wherein the solid-state and solid-state-like batteries include: a positive electrode, a negative electrode, and a dielectric film between the positive electrode and the negative electrode; the dielectric film includes: a PE (Polyethylene) layer; at least one dielectric film sheet located on the side of the PE layer; the dielectric film sheet is composed of PVDF (polyvinylidene difluoride), a plurality of LLZO (lithium-lanthanum-zirconium oxide) particles, a polyimide (PI) modifier, and LiTFSI (LiN(CF3SO2)2, lithium bis(trifluoromethanesulfonyl)imide); wherein the polyimide (PI) modifier is a polymer material with good heat resistance, chemical resistance, and electrical insulation; mixing the polyimide (PI) modifier with the LLZO particles can effectively reduce the surface energy of the LLZO particles and improve the surface stability of the LLZO particles.

Claims

1. A dielectric film having a PI mixed slurry layer for use in solid-state and solid-like batteries, wherein the solid-state battery comprises: a positive electrode, a negative electrode, and a dielectric film between the positive electrode and the negative electrode; the dielectric film comprises: a PE (Polyethylene) layer; at least one dielectric film coated on the side of the PE layer; the dielectric film is composed of PVDF (polyvinylidene difluoride), a plurality of LLZO (lithium-lanthanum-zirconium oxide) particles, a polyimide (PI) modifier, and LiTFSI (LiN(CF3SO2)2, lithium bis(trifluoromethanesulfonyl)imide); wherein the polyimide (PI) modifier is a polymer material with good heat resistance, chemical resistance, and electrical insulation; mixing the polyimide (PI) modifier with the LLZO particles can effectively reduce the surface energy of the LLZO particles and improve the surface stability of the LLZO particles.

2. The dielectric film as described in claim 1, wherein the weight ratio of the PVDF, the polyimide (PI) modifier, the plurality of LLZO particles, and the LiTFSI in the dielectric film is 6~10:0.8~1.6:4~8:4~8.

3. The dielectric film as described in claim 1, wherein the PVDF in the dielectric film is used as an adhesive and can also provide support for the dielectric film; the LLZO particles are used to conduct lithium ions; and the LiTFSI is a lithium salt material that increases the conductivity of lithium ions and can also be used to adjust the pH in the manufacturing process.

4. The dielectric film as described in claim 1, wherein the thickness of the PE layer is between 5 micrometers and 10 micrometers; the overall thickness of each dielectric film sheet is between 1 micrometer and 6 micrometers; and the total thickness of the dielectric film does not exceed 20 micrometers.

5. The dielectric film as described in claim 1, wherein the side of the PE layer is further coated with at least one aluminum oxide layer; the aluminum oxide layer is mainly used as a support.

6. The dielectric film as described in claim 5, wherein the thickness of the alumina layer is between 1 micrometer and 5 micrometers.

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