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Method for preparing composite polymer solid electrolyte

A solid electrolyte and composite polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of inability to meet the use requirements of solid-state lithium-ion batteries, poor mechanical and thermal stability, and poor nanoparticle dispersion. Lithium dendrite growth, improved safety and energy density, good thermal stability

Inactive Publication Date: 2019-06-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid-state electrolytes include polymer electrolytes and inorganic solid-state electrolytes. These two types of electrolytes have the following advantages and disadvantages: (1) Polymer electrolytes have the advantages of simple preparation, low price, good film-forming properties and flexibility, and low interfacial impedance with electrodes, etc. Advantages, but there are disadvantages such as narrow electrochemical window, low room temperature ionic conductivity, poor mechanical and thermal stability; (2) Inorganic solid electrolytes based on oxides and sulfides have wide electrochemical window, room temperature ionic conductivity High advantages, but there are disadvantages such as poor flexibility and film formation, and high interfacial impedance with electrodes
[0004] At present, inorganic nanoparticles are often used as filling materials to prepare composite polymer solid electrolytes of inorganic / organic hybrid systems. The respective advantages of inorganic filling materials and polymer electrolytes and their interface interactions are used to broaden the electrochemical window of the electrolyte. Improve ionic conductivity, but the dispersion of nanoparticles in the matrix is ​​poor, and the electrolyte performance is improved slightly, which cannot meet the requirements of solid-state lithium-ion batteries

Method used

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  • Method for preparing composite polymer solid electrolyte
  • Method for preparing composite polymer solid electrolyte
  • Method for preparing composite polymer solid electrolyte

Examples

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Embodiment example 1

[0022] Step 1: Weigh 2.0g of aramid fibers and 1.0g of potassium hydroxide into a certain amount of dimethyl sulfoxide, stir at room temperature for 7 days (or 3 days at 60°C) until the aramid fibers are completely dissolved , to obtain a well-dispersed aramid nanofiber solution, wherein the concentration of aramid nanofiber is about 12.5mg / mL;

[0023] Step 2: Apply the above solution to a clean glass plate by the scraper method, and transfer it to water to stand still for 0.5h until the aramid nanofiber gel film is detached from the glass plate, and then transfer the gel film to Stand still in water / isopropanol solution (volume ratio 1:1) for 1–24 hours to fully replace dimethyl sulfoxide with water / isopropanol solution;

[0024] Step 3: Put the above-mentioned aramid nanofiber gel film into a freeze-drying box, and dry it under vacuum for 24-48 hours to completely evaporate the solvent to obtain a three-dimensional porous aramid nanofiber film for use;

[0025] Step 4: Wei...

Embodiment example 2

[0028] Step 1: Weigh 2.0g of aramid fibers and 1.0g of potassium hydroxide into a certain amount of dimethyl sulfoxide, stir at room temperature for 7 days (or 3 days at 60°C) until the aramid fibers are completely dissolved , obtain a well-dispersed aramid nanofiber solution, wherein the concentration of the aramid nanofiber is about 10 mg / mL, ready for use;

[0029] Step 2: Put 50 mg of lithium titanium aluminum phosphate nanoparticles into 1 mL of dimethyl sulfoxide and stir for 24 hours to obtain a well-dispersed solution of lithium titanium aluminum phosphate nanoparticles with a concentration of about 50 mg / mL;

[0030] Step 3: Under vigorous stirring, take out 5 mL of the aramid nanofiber solution described in step 1, and add it dropwise to the lithium titanium aluminum phosphate nanoparticle solution described in step 2, and continue stirring for 24 hours to obtain a dispersity Better aramid nanofiber / lithium titanium aluminum phosphate nanoparticle composite solution;...

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Abstract

The invention relates to a method for preparing a composite polymer solid electrolyte. A composite solution containing aramid nanofibers and inorganic ion conductor type particles is processed by a knife coating process, a vacuum freeze drying process and the like, a three-dimensional porous aramid nanofiber / inorganic ion conductor type particle film is prepared, then the porous film is filled with a polymer electrolyte solution, and a composite polymer solid electrolyte film is obtained through drying processing. The method has the characteristics of simple operation and low cost, the obtained composite electrolyte has the advantages of wide electrochemical window, high ionic conductivity, high mechanical strength and the inhibition of lithium dendrite growth. The composite electrolyte has a broad application prospect in a solid lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium ion batteries, and relates to a preparation method of a composite polymer solid-state electrolyte. Background technique [0002] Due to the advantages of high energy density, long service life, no memory effect, and no pollution, lithium-ion batteries are gradually replacing rechargeable batteries such as lead-acid, nickel-chromium, and nickel-metal hydride, and are widely used in portable electronic products, transportation, and large-scale energy storage. Storage and other fields, but the use of electrolyte causes safety problems such as leakage, flatulence, combustion, and explosion. [0003] The use of solid electrolytes instead of electrolytes is expected to solve the safety problems caused by liquid electrolytes, and can further increase the energy density of batteries, broaden the operating temperature range of batteries, prolong battery life, and simplify the battery manufactur...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCY02E60/10
Inventor 刘乐浩李美成莫金珊蒋喆姜冰褚立华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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