Polymer electrolyte preparing method and polymer electrolyte

A polymer and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of low mechanical strength, low ionic conductivity, high temperature resistance, etc., to improve rate performance, improve safety performance, and prevent localization. The effect of overcurrent heating

Active Publication Date: 2016-07-27
SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of a polymer electrolyte in view of the problems that the polymer electrolyte in the prior art is not resistant to high temperature, low in mechanical strength, and low in ion conductivity

Method used

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Examples

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Effect test

preparation example Construction

[0018] The preparation method of the polymer electrolyte provided by the invention comprises the following steps:

[0019] S1. Stir and mix the monomer and polymer lithium salt in water to obtain a pre-emulsified emulsion; the polymer lithium salt is selected from 11-methacryloyloxyundecyllithium sulfate, 11-crotonyloxydeca Monoalkyl lithium sulfate, lithium propyl tetradecyl maleate sulfonate, lithium allyl sulfonate, lithium 2-acrylamide-2-methylpropene sulfonate, lithium vinyl sulfonate, vinyl benzene One or more of lithium sulfonate, lithium acrylate, and lithium methacrylate;

[0020] S2. The temperature of the pre-emulsified emulsion is raised to 65-75°C, and the reaction is continued for 0.5-1h;

[0021] S3, taking the monomer and polymer lithium salt again, and stirring and mixing in water to obtain a second emulsion; adding the second emulsion to the pre-emulsified emulsion in multiple times, and continuing to react for 4-6 hours;

[0022] S4, raising the temperatur...

Embodiment 1

[0054] This reference example is used to illustrate the polymer electrolyte disclosed in the present invention and its preparation method.

[0055] Take 3g of 2-acrylamide-2-methylpropanesulfonic acid, make a 30mL solution, and add lithium carbonate to obtain lithium 2-acrylamide-2-methylpropanesulfonate as a lithium polymer salt.

[0056] Dissolve 0.2g of APS initiator in 20mL of water to make an initiator solution.

[0057] First take 3g of butyl acrylate, 10mL of lithium 2-acrylamide-2-methylpropanesulfonate solution, 10mL of initiator solution, and 40mL of water, stir and mix to obtain a pre-emulsified emulsion. Then the temperature was raised slowly to 70°C, and the reaction was continued for 0.5h.

[0058] Mix and stir 9 g of butyl acrylate, 10 mL of lithium 2-acrylamide-2-methylpropanesulfonate solution, and 60 mL of water to form a second emulsion.

[0059] Before the separation of the second emulsion, the above-mentioned second emulsion was added to the above-mentio...

Embodiment 2

[0064] This reference example is used to illustrate the polymer electrolyte disclosed in the present invention and its preparation method.

[0065] Take 1.5 g of methacrylic acid, make a 30 mL solution, add lithium carbonate, and obtain lithium methacrylate as a lithium polymer salt.

[0066] Dissolve 0.1g of APS initiator in 20mL of water to make an initiator solution.

[0067] Take 1.5g methyl methacrylate, 10mL lithium methacrylate solution, 10mL initiator solution, and 30mL water, stir and mix to obtain a pre-emulsified emulsion. Then the temperature was raised slowly to 70°C, and the reaction was continued for 0.5h.

[0068] At the same time, 1.5 g of methyl methacrylate, 0.5 g of methoxyethyl acrylate, 10 mL of lithium methacrylate solution, 10 mL of initiator solution, and 25 mL of water were respectively mixed and stirred to form a second emulsion, two batches in total.

[0069] Add the above 2 batches of the second emulsion to the above pre-emulsified emulsion. Afte...

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Abstract

For overcoming the problems in the prior art that a polymer electrolyte is intolerant to high temperature, low in mechanical strength and low in ionic conductivity, the invention provides a polymer electrolyte preparing method including the steps: S1, mixing a monomer and a polymer lithium salt in water, to obtain a pre-emulsified emulsion; S2, heating the pre-emulsified emulsion up to 65-75 DEG C, and carrying out a reaction for 0.5-1 h; S3, again taking the monomer and the polymer lithium salt, and mixing in water, to obtain a second emulsion; and adding the second emulsion to the pre-emulsified emulsion for multiple times, and carrying out a reaction for 4-6 h; S4, heating up to 80-90 DEG C, and carrying out a reaction for 0.5-1 h, to obtain a polymer emulsion; and S5, infiltrating a non-woven substrate in the polymer emulsion, carrying out ultrasonic treatment for 10-60 s, and drying. At the same time, the invention also discloses the polymer electrolyte prepared by the method. The polymer electrolyte provided by the invention is resistant to high temperature, high in mechanical strength, high in ionic conductivity and high in lithium ion transference number.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a polymer electrolyte and a polymer electrolyte prepared by the method. Background technique [0002] Lithium-ion batteries have been widely used in electronic equipment, and also play an important role in the field of energy storage for new energy development. Due to its high conductivity and good permeability, liquid electrolyte is still the mainstream type of electrolyte for lithium-ion batteries. However, the thermal deformation temperature of the separator in the liquid electrolyte is not high, and the electrolyte is easy to leak, volatilize, and burn. After lithium dendrites or conductive particles puncture the separator, a short circuit occurs at the puncture point, and the temperature at the open circuit rises, and the separator melts, and the positive and negative electrode areas contact, resulting in a large area short circuit, which limits t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 李光兴卢国杰刘志远于立娟韩晓辉程君李文良
Owner SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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