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Lithiated functional polymer for lithium ion battery, and preparation method and application thereof

A technology of functional polymers and lithium-ion batteries, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as the inability to realize fast charging of lithium-ion batteries

Active Publication Date: 2020-09-15
ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these materials are overall chemically / electrochemically stable and have strong adhesion, they cannot achieve fast charging of lithium-ion batteries
At present, there are few reports on the rapid charging of lithium-ion batteries by designing the molecular structure of the battery negative electrode binder.

Method used

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  • Lithiated functional polymer for lithium ion battery, and preparation method and application thereof
  • Lithiated functional polymer for lithium ion battery, and preparation method and application thereof
  • Lithiated functional polymer for lithium ion battery, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1PA

[0055] The preparation of preparation example 1PAALi-PMA-PAALi triblock polymer

[0056] Step 1: Preparation of the first block polyacrylic acid (PAA)

[0057]

[0058] Mix 0.6 parts of RAFT reagent, 0.2 parts of initiator and 20 parts of acrylic acid monomer in 150 parts of deionized water solvent, stir and react at 70°C for 18 hours to obtain a reaction mixture containing the compound of formula (1'); wherein, RAFT reagent for Wherein, R is an acetate group; Z is a benzyl group; the initiator is potassium persulfate;

[0059] Step 2: Preparation of the second block polymethyl acrylate (PAA-PMA)

[0060]

[0061] Add 60 parts of methyl acrylate monomers to the reaction mixture obtained in step 1, then continue stirring at 70°C for 6h to obtain a reaction mixture containing the compound of formula (2');

[0062] Step 3: Preparation of the third block polyacrylic acid (PAA-PMA-PAA)

[0063]

[0064] Add 20 parts of acrylic acid monomers to the reaction mixture obt...

preparation example 2N

[0069] The preparation of preparation example 2NafionLi

[0070] Adjust the pH of the solution of perfluorosulfonic acid resin (Nafion-H) in deionized water to 5, then add 10% by mass fraction of 0.15mol / L lithium hydroxide aqueous solution, and carry out lithiation at 25°C for 4h; The resulting solution containing NafionLi was directly used to prepare the binder.

preparation example 3

[0071] The preparation of preparation example 3 binding agent

[0072] The PAALi-PMA-PAALi triblock polymer prepared in Preparation Example 1 and the solution containing NafionLi prepared in Preparation Example 2 were mixed in 100 parts of deionized water.

[0073] It is then used as a binder for making electrode pads.

[0074] Among them, the mass ratio of PAALi-PMA-PAALi triblock polymer to NafionLi, mixing temperature and mixing time are shown in the table below.

[0075] Adhesive sample PAALi-PMA-PAALi parts by mass Parts by mass of NafionLi Mixing temperature and time Binder 1 9 1 30℃24h binder 2 8 2 30℃24h binder 3 7 3 40℃24h binder 4 6 4 40℃24h Binder 5 5 5 50℃24h Binder 6 4 6 50℃24h Binder 7 3 7 50℃24h Binder 8 2 8 60℃24h Binder 9 1 9 60℃24h

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Abstract

The invention relates to a lithiated functional polymer for a lithium ion battery, and a preparation method and application thereof, and concretely provides a lithiated functional polymer representedby formula (I), and a preparation method thereof. The lithiated functional polymer and the lithiated perfluorosulfonic acid resin (Nafion-Li) are mixed and can be used for preparing a binder for the lithium ion battery, and the binder endows the lithium ion battery with rapid charging capacity.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a lithium-ion battery fast-charging lithiated functional polymer, a preparation method thereof, and an application in lithium-ion battery pole pieces. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, power tools, mobile electronic equipment and other fields. With the development of these fields and the improvement of people's demand for products in this field, the requirements for lithium-ion batteries are getting higher and higher. Especially in the field of electric vehicles, there are still problems such as short mileage on a single charge and long charging time. How to realize fast charging of lithium-ion batteries is an important research direction in this field. [0003] At present, the binders for negative electrodes of lithium-ion batteries are mainly styrene-butadiene rubber (SBR), acrylic acid / acrylic acid...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F220/06C08F220/14C08F8/44H01M4/133H01M4/62H01M10/0525
CPCC08F293/005C08F220/06C08F220/14C08F8/44H01M4/622H01M4/623H01M4/133H01M10/0525C08F2438/03Y02E60/10
Inventor 魏迪锋孙化雨李昊陶亮林玉春
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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