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Solid electrolyte and preparation method thereof

A solid electrolyte and electrolyte technology, applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve problems such as safety, energy density that cannot meet daily use, safety problems, high hardness and difficult processing, etc., to achieve Non-flammable, not easy to decompose and produce gas, good contact performance, and enhanced mechanical strength

Pending Publication Date: 2021-12-31
佛山(华南)新材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries, as the mainstream batteries in the three major sectors of energy storage, power, and consumer batteries, have certain safety and energy density problems that cannot meet daily use, but their safety issues have always been criticized
Polymer solid electrolyte has good interfacial contact but low ionic conductivity (10-4~10-6S / cm) and low strength. It is easy to melt and decompose at high temperature, but it is soft and easy to process and cheap, so it often needs solid electrolyte with oxide Composite; the ionic conductivity of the oxide solid electrolyte is not high (10-3~10-4S / cm), and the physical contact with the electrode interface is not good, and the hardness is high and difficult to process. The advantage is that it is stable in the air, and the oxide solid state is prepared The electrolyte is often combined with a polymer solid electrolyte to form a film belt, or other polymers are used as a binder to prepare a film belt; Ternary (nickel-cobalt-manganese) oxide positive electrode interface is not compatible, the positive electrode material needs to be processed, and it will react with water to generate toxic gas hydrogen sulfide, which has poor stability in the air

Method used

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  • Solid electrolyte and preparation method thereof

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preparation example Construction

[0042] In the prior art, there is no solid electrolyte that can simultaneously have good electrode interface compatibility, high ionic conductivity, and reliable safety performance. Therefore, the present invention provides a method for preparing a solid electrolyte that meets the above requirements, including :

[0043] respectively coating the first slurry on both surfaces of the porous polymer membrane, and drying to obtain the first coating layer;

[0044] Coating a first gel on the outer surface of the first coating layer, and obtaining a first gel layer after curing;

[0045] A solid electrolyte is obtained after cold pressing.

[0046] The first slurry includes filler, binder and solvent;

[0047] The first gel is prepared by mixing gel monomer, electrolyte and initiator;

[0048] The porous polymer membrane includes porous polyimide membrane, porous polyvinylidene fluoride membrane, porous composite polypropylene membrane, porous polyethylene diaphragm, porous polyvin...

Embodiment 1

[0088] This embodiment provides a method for preparing a solid electrolyte:

[0089] S1, preparation of porous polyimide membrane

[0090] The preparation method of described porous polyimide film is:

[0091] A. First weigh 34g of DMAC and put it into a beaker, then weigh 4.5g of ODA and add it to DMAC, use a stirrer to stir and dissolve for 15 minutes, then weigh 6.5g of PMDA, use a stirrer to stir for 3 hours Dissolve completely, stop stirring, and wait for 7.5 hours to polymerize the solution to obtain a polyamic acid (PAA) solution.

[0092] B. Weigh 9g of PEG and add it into the PAA solution, stir and mix for 3 hours with a stirrer. The obtained solution was coated on a glass plate with a doctor blade, and the wet film thickness was 200 μm. After coating, it was dried in a blast oven at 60° C. for 3 hours.

[0093] C. Heat treatment: Put the dried film together with the glass plate in a blast oven at 100°C for 2 hours, then dry at 200°C for 2 hours, then transfer to a...

Embodiment 2

[0105] This embodiment provides a method for preparing a solid electrolyte:

[0106] S1, preparation of porous polyimide membrane

[0107] The preparation method of described porous polyimide film is:

[0108] A. First weigh 40g of DMAC and put it into a beaker, then weigh 5g of ODA and add it to DMAC, use a stirrer to stir and dissolve for 15 minutes, then weigh 8g of PMDA, use a stirrer to stir for 3 hours and then dissolve completely , stop stirring, and wait for 7.5 hours to polymerize the solution to obtain a polyamic acid (PAA) solution.

[0109] B. Electrospinning the PAA solution using an electrospinning machine. A steel needle with an inner diameter of 0.35mm was selected, the flow rate was 1mL / h, the voltage was 21KV, and the room temperature was 25°C. The distance between the needle tip and the winding machine is 25cm, the receiver is aluminum foil, and the aluminum foil is fixed on the winding machine with scotch tape. Select the above conditions to carry out e...

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Abstract

The invention discloses a solid electrolyte and a preparation method thereof. The preparation method comprises the steps of respectively coating first slurry on two surfaces of a porous polymeric membrane, and drying to obtain a first coating layer; coating first gel on the outer surface of the first coating layer, and curing to obtain a first gel layer; and carrying out cold press molding to obtain the solid electrolyte. The solid electrolyte sequentially comprises a first gel layer, a first coating layer, a porous polymeric membrane, a second coating layer and a first gel layer, wherein the first gel layer is in contact with a positive electrode or a negative electrode of the battery. The preparation process is environment-friendly and energy-saving, and the prepared solid electrolyte electrode is good in interface contact performance, high in ionic conductivity and high in safety performance.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes, in particular to a solid electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries, as the mainstream batteries in the three major sectors of energy storage, power, and consumer batteries, have certain safety and energy density problems that cannot meet daily use, but their safety issues have always been criticized. The battery can be divided into four parts: positive electrode, negative electrode, electrolyte, and diaphragm. When the positive and negative electrodes are in direct contact, a short circuit will occur and a large amount of energy will be generated instantaneously. The diaphragm is the key material that separates the positive and negative electrodes. The electrolyte is transported as lithium ions. The key problem is that the liquid electrolyte currently used is flammable and volatile, and it is easy to decompose under high voltage, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565
CPCH01M10/058H01M10/0565H01M2300/0094Y02E60/10Y02P70/50
Inventor 刘亭陈子健徐亚辉
Owner 佛山(华南)新材料研究院