Preparation method of all-solid-state composite polymer electrolyte membrane

A technology of composite polymer and electrolyte membrane, applied in the direction of circuits, electrical components, battery components, etc., can solve the problem of low conductivity, achieve high conductivity, high production efficiency, and improve conductivity

Inactive Publication Date: 2015-04-08
邓丽娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing an all-solid composite polymer electrolyte to solve the problem of low conductivity of the existing all-solid composite polymer electrolyte membrane

Method used

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  • Preparation method of all-solid-state composite polymer electrolyte membrane
  • Preparation method of all-solid-state composite polymer electrolyte membrane
  • Preparation method of all-solid-state composite polymer electrolyte membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Measure the conductivity at room temperature of electrolyte membranes made of different lithium salts

[0020] Experimental group 1: Mix 2.5g PEO and 2.5g PPC powder, add the PEO / PPC mixture into 50ml acetone solution, stir for 12 hours to obtain a uniform PEO / PPC-acetone solution. 0.5g LiPF 6 1.0 g of calcium fluoride was added to 50 ml of acetone solution, and stirred for 12 hours to obtain a lithium salt-calcium fluoride-acetone solution. Mix the above PEO / PPC-acetone solution with the lithium salt-calcium fluoride-acetone solution and stir for 12 hours, then pour the obtained mixed solution into a polytetrafluoroethylene mold, place it at room temperature, and form a film naturally; vacuum dry at 60°C After 24 hours, the all-solid composite polymer electrolyte membrane was obtained.

[0021] The method for measuring the conductivity of the electrolyte membrane at room temperature is as follows:

[0022] Measured by Chenhua CHI760B electrochemical wo...

Embodiment 2

[0028] Embodiment 2: Take 8.0g PEO, 2.0g PPC powder and mix, add PEO / PPC mixture in 50ml acetone solution, stir 12h to obtain uniform PEO / PPC-acetone solution. 0.5g LiBF 4 , 1.0g of calcium fluoride was added to 50ml of acetone solution, stirred for 12h to obtain LiBF 4 - Calcium fluoride-acetone solution. The above PEO / PPC-acetone solution and LiBF 4 - Calcium fluoride-acetone solution is mixed and stirred for 12 hours, then pour the obtained mixed solution into a polytetrafluoroethylene mold, place it at room temperature, and form a film naturally; vacuum dry at 60°C for 24 hours to obtain an all-solid composite polymer electrolyte membrane .

[0029] Experimental group 3: Mix 5.0g PEO and 5.0g PPC powder, add the PEO / PPC mixture into 50ml acetone solution, stir for 12 hours to obtain a uniform PEO / PPC-acetone solution. 0.5g Li 2 B 12 f 12 1.0 g of calcium fluoride was added to 50 ml of acetone solution, and stirred for 12 hours to obtain a lithium salt-calcium fluori...

Embodiment 8

[0034] Example 8: The following experimental groups A-D are all-solid-state composite polymer electrolyte membranes made of lithium salts, calcium fluoride, PEO and PPC with different mass ratios, and the electrical conductivity of the prepared electrolyte membranes is measured respectively, as shown below :

[0035] Experimental group A : Weigh 0.5g of LiN(SO 2 F) 2 6 parts, 6 parts of 1g of calcium fluoride, and then according to the mass ratio of lithium salt, calcium fluoride and PEO / PPC mixture as 1:2:5, weigh 6 groups of PEO / PPC mixtures, that is, the mass ratio of PEO and PPC respectively 4:1 (PEO2.0g, PPC0.5g), 2.3:1 (PEO1.74g, PPC0.76g), 1.5:1 (PEO1.5g, PPC1g), 1:1 (PEO1.25g, PPC1.25g) , 0.7:1 (PEO1.03g, PPC1.47g), 0.4:1 (PEO0.71g, PPC1.79g).

[0036] Add the above-mentioned 6 groups of PEO / PPC mixtures weighed into 50ml of acetone solution respectively, and stir for 12 hours to obtain 6 groups of uniform PEO / PPC-acetone solutions.

[0037] 6 parts weighed LiN(SO...

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Abstract

The invention provides a preparation method of an all-solid-state composite polymer electrolyte membrane. The preparation method comprises the following specific steps of: 1) weighing and mixing a certain amount of PEO and PPC powder, adding a PEO / PPC mixture into an acetone solution, and stirring for 12 hours to obtain an even PEO / PPC-acetone solution; 2) adding a lithium salt and calcium fluoride into the acetone solution, and stirring for 12 hours to obtain an even lithium salt-calcium fluoride-acetone solution; 3) stirring the PEO / PPC-acetone solution obtained in the step 1) and the lithium salt-calcium fluoride-acetone solution obtained in the step 2) after being proportionally-mixed, and then pouring an obtained mixed solution into a polytetrafluoroethylene mould, placing at room temperature, and naturally forming a film; and drying for 24 hours at a temperature of 60 DEG C in vacuum, thereby obtaining the all-solid-state composite polymer electrolyte membrane. The all-solid-state composite polymer electrolyte membrane provided by the invention is high in conductivity.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery separator, in particular to a preparation method of an all-solid composite polymer electrolyte membrane. Background technique [0002] The separator is one of the key components of lithium-ion batteries. At present, the separators of commercialized lithium batteries mainly use polyethylene and polypropylene microporous membranes. However, polyethylene and polypropylene separators have many disadvantages, such as low porosity, low melting point, poor mechanical strength, and poor affinity for electrolytes, which affect the safety of lithium batteries. [0003] In order to improve these shortcomings, many materials such as polymer electrolytes have been studied for the manufacture of lithium battery separators. Polyethylene oxide (PEO) is the earliest researched polymer electrolyte material, but the composite polymer film formed by PEO and lithium ion compounds has low conductivity at r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L71/02C08L69/00C08K3/16C08K3/32C08K3/38C08K3/30H01M2/16
CPCY02E60/10
Inventor 邓丽娟况丽娟
Owner 邓丽娟
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