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Polymer, and preparation method and application thereof

A technology of polymers and gel polymers, applied in electrochemical generators, electrical components, circuits, etc., can solve problems such as electrolyte instability, achieve good rate and cycle performance, good liquid absorption capacity, and good stability Effect

Inactive Publication Date: 2017-03-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the operating voltage is increased, the traditional carbonate-based electrolyte becomes unstable and will start to decompose

Method used

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  • Polymer, and preparation method and application thereof
  • Polymer, and preparation method and application thereof
  • Polymer, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In the polymer and its preparation method and application provided in this example, the mass percentages of each component in the raw materials used to prepare the polymer are: monomer 33.3%, emulsifier 1.5%, initiator 0.2%, deionized Water 65.0%.

[0043] The preparation method comprises the following steps:

[0044] 1) in N 2 Under the protection of the atmosphere, add the emulsifier sodium lauryl sulfate into deionized water to dissolve, then add the monomer (the mass ratio of methyl methacrylate, acrylonitrile and butyl acrylate is 4:2:1), and stir evenly , add the initiator sodium persulfate with a constant pressure funnel to react at 55°C (adding in two times), the stirring speed is controlled at 1000r / min; after 6 hours of reaction, a white emulsion is obtained, and the white emulsion is poured into 1 times the above reaction Volume, mass percentage is 3.0% Al 2 (SO 4 ) 3 The solution is stirred to break the emulsification, and the polymer is obtained by washi...

Embodiment 2

[0050] In the polymer and its preparation method and application provided in this example, the mass percentages of each component in the raw materials used to prepare the polymer are: 32.3% monomer, 1.5% emulsifier, 0.2% initiator, deionized Water 66%.

[0051] The preparation method comprises the following steps:

[0052] 1) Under the protection of argon atmosphere, add the emulsifier sodium lauryl sulfate into deionized water to dissolve, and then add the monomer (the mass ratio of methyl methacrylate, acrylonitrile and butyl acrylate is 4:2: 1), stir evenly, add the initiator sodium persulfate with a constant pressure funnel to react at 57°C (adding in two times), the stirring speed is controlled at 1020r / min, and the white emulsion is obtained after 6 hours of reaction; then the white emulsion Pour 1.1 times the above reaction volume, the mass percentage is 3% Al 2 (SO 4 ) 3 Stirring in the solution to break the emulsification, washing and drying to obtain the polymer ...

Embodiment 3

[0057] In the polymer and its preparation method and application provided in this example, the mass percentage of each component in the raw materials used to prepare the polymer is: monomer 28.9%, emulsifier 1.0%, initiator 0.1%, deionized Water 70.0%;

[0058] The preparation method comprises the following steps:

[0059] 1) Dissolve the emulsifier potassium lauryl sulfate in deionized water under the protection of an argon atmosphere, and then add monomers (the mass ratio of methyl methacrylate, acrylonitrile and butyl acrylate is 2:2:1 ), after stirring evenly, add the initiator potassium persulfate with a mass percentage of 0.1% at 55°C with a constant pressure funnel, control the stirring speed at 800r / min, and obtain a white emulsion after reacting for 5 hours, then pour the white emulsion into 2% Al by mass concentration 2 (SO 4 ) 3 Stirring in the solution to break the emulsification, washing and drying to obtain the polymer used for the gel polymer electrolyte.

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Abstract

The invention relates to a polymer, and a preparation method and application thereof. The polymer has a structural formula as shown in the specification. In the structural formula, the polymer is prepared by using a mixture of methyl methacrylate, acrylonitrile and butyl acrylate as a monomer through polymerization; meanwhile, the mass ratio of methyl methacrylate to acrylonitrile to butyl acrylate in the monomer is (4-1): (4-1): (2-1). The polymer provided by the invention is used for preparing a gel polymer electrolyte, enables the gel polymer electrolyte to have high electrochemical stability window, shows a longer cycle life compared with a traditional carbonate liquid electrolyte battery after applied to a lithium ion battery with a voltage level of 5 V, and is an ideal electrolyte matching with a high-voltage cathode material.

Description

technical field [0001] The invention relates to the field of lithium ion battery electrolytes, in particular to a polymer and its preparation method and application. Background technique [0002] The shortage of energy and the deterioration of the environment force humans to develop new energy sources such as wind energy, solar energy, and tidal energy. However, due to the time and geographical imbalance of new energy, an energy storage system is required for storage and utilization. Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect, and are currently the most suitable energy storage battery devices. The structure of the lithium-ion battery itself (positive electrode / diaphragm / negative electrode) requires the use of a low-flash point flammable carbonate-based liquid electrolyte to activate other solid components of the battery. However, the safety of lithium batteries using carbonate-based electrolytes It has become a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/44C08F220/18C08J9/40H01M10/0565
CPCY02E60/10
Inventor 廖友好陈婷婷罗雪仪黄伟源李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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