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All-solid composite polymer electrolyte and preparation method thereof, and lithium ion battery

A polymer and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of strict preparation and use environment, all-solid-state electrolyte with excellent performance, narrow electrochemical stability window, etc., to achieve scale-up production and good ion conductivity , Excellent effect of interface contact

Inactive Publication Date: 2019-11-08
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymers have high safety and environmental friendliness, but the room temperature ionic conductivity is too low and the electrochemical stability window is narrow, so the application range is narrow
Oxide has good ion conductivity at room temperature, but it is hard and brittle, not easy to process, and has poor contact with electrodes, so it basically cannot work at room temperature
Sulfides have excellent ionic conductivity at room temperature, but the preparation and use of environmental conditions are strict and the cost is high
In summary, it is difficult to obtain an all-solid-state electrolyte with excellent performance (ion transport and interface contact), simple preparation, low cost, and wide application

Method used

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  • All-solid composite polymer electrolyte and preparation method thereof, and lithium ion battery
  • All-solid composite polymer electrolyte and preparation method thereof, and lithium ion battery
  • All-solid composite polymer electrolyte and preparation method thereof, and lithium ion battery

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preparation example Construction

[0037] In a first aspect, the present invention provides a method for preparing an all-solid composite polymer electrolyte, comprising the following steps:

[0038] S1. Preparation of a polymer matrix membrane: After uniformly mixing the first polymer with a solvent, a thin film is formed by a phase inversion method to obtain a polymer matrix membrane with several closely arranged vertical through holes;

[0039] S2. Prepare a thin layer of polymer electrolyte, gradually add inorganic powder, lithium salt, the second polymer and an appropriate amount of additives into the solvent, stir in a glove box filled with argon to form a polymer electrolyte, and then control the moisture, oxygen In a separate environment, scrape-coat the polymer electrolyte to form a film, and then vacuum-dry it after standing at room temperature to obtain a thin polymer electrolyte layer;

[0040] S3. Preparation of composite solid electrolyte by hot-press impregnation: place the polymer electrolyte th...

Embodiment 1

[0066] The preparation method of all-solid-state composite polymer electrolyte, the steps are as follows:

[0067] S1. Prepare a polymer matrix membrane, the polymer matrix membrane has a number of closely arranged vertical through holes; the specific steps are: (1) dissolving polyacrylonitrile (molecular weight: 100,000) in dimethyl sulfoxide, at 60 Stir and mix at ℃ for 3 hours to obtain a uniform and transparent film-forming solution; wherein, the concentration of polyacrylonitrile in the film-forming solution is 5%; (2) scrape-coat the film-forming solution on a glass plate with a thickness of 20 μm; (3 ) Soak the obtained flat film in deionized water for 5 hours, take it out, let it stand at room temperature for 10 hours, transfer it to a refrigerator at 4°C for 24 hours, and then perform freeze-drying treatment for 10 hours to obtain a polymer matrix film;

[0068] S2. Gradually add the inorganic powder LLZTO, lithium bistrifluoromethanesulfonimide, polyethylene oxide (m...

Embodiment 2

[0071] The preparation method of all-solid-state composite polymer electrolyte, the steps are as follows:

[0072] S1. Prepare a polymer matrix membrane, the polymer matrix membrane has a number of closely arranged vertical through holes; the specific steps are: (1) dissolving polyvinylidene fluoride (molecular weight: 50000) in N,N-dimethyl In formamide, stir and mix at 60°C for 3 hours to obtain a uniform and transparent film-forming solution; (2) scrape-coat the film-forming solution on a glass plate with a thickness of 20 μm; (3) place the obtained flat film on a deionized After soaking in water for 5 hours, take it out, let it stand at room temperature for 10 hours, transfer it to a refrigerator at 4°C for 24 hours, and then perform freeze-drying treatment for 10 hours to obtain a polymer matrix film;

[0073] S2. Gradually add inorganic powder silica, lithium hexafluorophosphate, polyvinyl carbonate (molecular weight 100,000) and 5% succinonitrile into acetonitrile solve...

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Abstract

The invention discloses an all-solid composite polymer electrolyte and a preparation method thereof, and a lithium ion battery. The method comprises the following steps of: S1, preparing a polymer matrix membrane by adopting a phase inversion method, wherein the polymer matrix membrane has a plurality of closely arranged vertical through holes; S2, gradually adding inorganic powder, lithium salt,a second polymer and an appropriate amount of auxiliary agent into a solvent for uniform stirring in an argon-filled glove box to obtain a polymer electrolyte, then, performing scrap coating of the polymer electrolyte in an environment controlled in moisture and oxygen to form a film, performing standing at room temperature to perform vacuum drying to obtain a polymer electrolyte film; and S3, putting the polymer electrolyte film prepared in the S2 at the upper portion of the polymer matrix membrane in the S1, performing melting and hot-pressing of the polymer electrolyte in a vacuum oven at atemperature of 100-350 DEG C into the vertical holes of the polymer matrix membrane. The all-solid composite polymer electrolyte is high in room-temperature conductivity and good in interface contact, has a high modulus and a high voltage window and is simple to prepare and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an all-solid composite polymer electrolyte, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion battery, also known as lithium secondary battery, is a rechargeable secondary power supply with high specific energy, excellent electrical performance, and can be made into various shapes. It is widely used in mobile phones, electric vehicles, notebook computers, Fields that require portable power such as photography / photography. With the continuous growth of demand in related industries, lithium-ion battery materials and technologies are in a stage of rapid development. Improving the safety, energy density and long life of lithium-ion batteries is the development direction of high-performance lithium batteries. In the core materials and technologies of lithium-ion batteries, the type and performance of the electrolyte syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 宋阿敏贺明辉黄科程
Owner SHENZHEN BAK POWER BATTERY CO LTD
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