CN-122025752-A - Flexible solid electrolyte membrane and preparation method thereof

Abstract

The invention discloses a flexible solid electrolyte membrane and a preparation method thereof, which belong to the technical field of solid batteries, and in particular relates to a preparation method of the flexible solid electrolyte membrane. The organic monomer can be polymerized to form polymer electrolyte under the initiation of the initiator, the flexible base film has a loose network structure and can allow inorganic electrolyte to pass through, the polymer electrolyte is crosslinked and polymerized on the flexible base film, the polymer electrolyte and the flexible base film are crosslinked with each other, and the inorganic electrolyte and the electrolyte are dispersed in the crosslinked and polymerized structure of the polymer electrolyte and the flexible base film. The invention relates to a flexible solid electrolyte membrane with good conductivity and good charge and discharge performance after a battery is manufactured and a preparation method thereof.

Inventors

• CAI DAN
• HAN ZHEN
• CHEN YUSHENG
• WANG XIULI
• LIANG WENMING
• TU JIANGPING

Assignees

• 杭州亿昇达新能源科技有限公司

Dates

Publication Date

20260512

Application Date

20260413

Claims (10)

1. 1. A preparation method of a flexible solid electrolyte membrane is characterized by comprising the steps of mixing electrolyte, organic monomers, inorganic electrolyte and an initiator to obtain electrolytic slurry, coating the electrolytic slurry on a flexible base membrane, and carrying out crosslinking solidification to obtain the flexible solid electrolyte membrane, wherein the electrolyte contains LiPF 6 , and the concentration of LiPF 6 in the electrolyte is 1-3M.
2. 2. The method according to claim 1, wherein the electrolyte further comprises EC and DMC, and the volume ratio of EC to DMC in the electrolyte is 1:0.5-2.
3. 3. The method of claim 1, wherein the organic monomer comprises an acrylate monomer and/or a vinylene carbonate monomer, and the acrylate monomer comprises at least one of ethoxylated trimethylolpropane triacrylate, polyethylene glycol diacrylate, polyethylene glycol methacrylate, and triethylene glycol dimethacrylate.
4. 4. The method according to claim 3, wherein the organic monomer is ethoxylated trimethylolpropane triacrylate, and the mass ratio of LiPF 6 to ethoxylated trimethylolpropane triacrylate is 1:0.4-2.
5. 5. The method of claim 1, wherein the organic monomers comprise 2-phenoxyethyl acrylate and 2-methylallylsulfonamine.
6. 6. The method of manufacturing according to claim 1, wherein the inorganic electrolyte comprises at least one of an oxide electrolyte, a sulfide electrolyte, and a halide electrolyte.
7. 7. The method according to claim 1, wherein an additive is further added to the electrolytic slurry preparation, the additive comprising at least one of a cyclic carbonate, an organic sulfate, a sulfonate, and a lithium salt.
8. 8. The method of claim 1, wherein the initiator comprises a photoinitiator or a thermal initiator.
9. 9. A flexible solid electrolyte membrane made by the method of any one of claims 1-8.
10. 10. A battery comprising the flexible solid electrolyte membrane of claim 9.

Description

Flexible solid electrolyte membrane and preparation method thereof Technical Field The invention belongs to the technical field of solid-state batteries, and particularly relates to a flexible solid electrolyte membrane and a preparation method thereof. Background Solid-state batteries have attracted considerable attention due to their high energy density and high safety. Among them, solid-state electrolytes have been widely studied as a key component of solid-state batteries. Among the numerous solid electrolytes, a composite solid electrolyte combining the advantages of an inorganic electrolyte and a polymer electrolyte has a wide industrial application prospect. However, the composite solid electrolyte generally has the problems of low ion conductivity and poor mechanical property, and is difficult to meet the requirements of large multiplying power and stable circulation of the solid battery. The traditional composite electrolyte is to add a small amount (less than or equal to 10 percent) of inorganic electrolyte particles into the polymer electrolyte, which can improve the ionic conductivity to a certain extent, but the ionic conductivity still cannot meet the fast charge requirement of the solid-state battery. And it is still difficult to suppress the generation and continuous growth of lithium dendrites during charge and discharge cycles with a small amount of inorganic electrolyte, and if a high proportion of inorganic electrolyte is added, there is a problem in that the flexibility of the electrolyte is poor. Disclosure of Invention The invention aims to provide a flexible solid electrolyte membrane with good conductivity and good charge and discharge performance after a battery is manufactured and a preparation method thereof. The technical scheme adopted by the invention for achieving the purpose is as follows: A method for preparing a flexible solid electrolyte membrane comprises the steps of mixing electrolyte, organic monomers, inorganic electrolyte and an initiator to obtain electrolyte slurry, coating the electrolyte slurry on a flexible base membrane, and carrying out crosslinking and curing to obtain the flexible solid electrolyte membrane, wherein the electrolyte solution contains LiPF 6, and the concentration of LiPF 6 in the electrolyte solution is 1-3M. The flexible solid electrolyte membrane is prepared by using the polymer electrolyte, the inorganic electrolyte and the electrolyte, if the usage amount of the polymer electrolyte is too small, the flexible solid electrolyte membrane cannot be prepared, and if the usage amount of the inorganic electrolyte is too high, the problem of poor flexibility can be caused. Preferably, the electrolyte also contains EC and DMC, and the volume ratio of EC to DMC in the electrolyte is 1:0.5-2. Preferably, the organic monomer comprises an acrylate monomer and/or a vinylene carbonate monomer, and the acrylate monomer comprises at least one of ethoxylated trimethylolpropane triacrylate, polyethylene glycol diacrylate, polyethylene glycol methacrylate and triethylene glycol dimethacrylate. More preferably, the organic monomer is ethoxylated trimethylolpropane triacrylate, and the mass ratio of LiPF 6 to ethoxylated trimethylolpropane triacrylate is 1:0.4-2. Preferably, the organic monomers include 2-phenoxyethyl acrylate and 2-methylallyl sulfonic acid amine. The polymer electrolyte prepared from the 2-phenoxyethyl acrylate, the 2-methallyl amine sulfonate and the ethoxylation trimethylolpropane triacrylate is used together for preparing the polymer electrolyte, the influences of the polymer electrolytes synthesized by different monomers on the flexible solid electrolyte membrane are different, and the conductive performance of the flexible solid electrolyte membrane can be improved under the combined action of the polymer electrolytes prepared from the 2-phenoxyethyl acrylate, the 2-methallyl amine sulfonate and the ethoxylation trimethylolpropane triacrylate, the inorganic electrolyte and the electrolyte, and the charge and discharge performance of the battery are improved after the battery is prepared. Preferably, the inorganic electrolyte includes at least one of an oxide electrolyte, a sulfide electrolyte, and a halide electrolyte. Preferably, additives including at least one of cyclic carbonates, organic sulfates, sulfonates, and lithium salts are also added to the electrolytic slurry preparation. Preferably, the initiator comprises a photoinitiator or a thermal initiator. The invention discloses a flexible solid electrolyte membrane prepared by the method. The invention discloses a battery, which comprises the flexible solid electrolyte membrane. Preferably, the battery comprises a positive electrode, an electrolyte membrane and a negative electrode which are laminated, wherein the positive electrode and the flexible base membrane are laminated in sequence from bottom to top, and the slurry containing electrolyte, a polymer monomer, an inorganic