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Lithium ion gel electrolyte based on polymethyl methacrylate-polystyrene diblock copolymer, and preparation method thereof

A technology of polymethyl methacrylate and gel electrolyte, which is applied in circuits, electrical components, secondary batteries, etc., can solve the problems of electrolyte leakage, explosion, battery expansion and deformation, etc., and achieve good film-forming properties and high ionic strength conductivity effect

Inactive Publication Date: 2012-02-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid electrolytes have high ionic conductivity, but they have the following problems in the application process: safety issues, high voltage or overcharge decomposition to generate gas, so that the battery expands and deforms, and may cause an explosion; Lithium prepared from liquid electrolytes Ion batteries are difficult to form; prone to electrolyte leakage; and are limited by extreme conditions such as high and low temperatures
However, PMMA-based GPE has defects such as poor mechanical strength, structural stability, thermal stability, and poor film-forming properties.

Method used

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  • Lithium ion gel electrolyte based on polymethyl methacrylate-polystyrene diblock copolymer, and preparation method thereof
  • Lithium ion gel electrolyte based on polymethyl methacrylate-polystyrene diblock copolymer, and preparation method thereof
  • Lithium ion gel electrolyte based on polymethyl methacrylate-polystyrene diblock copolymer, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Preparation of polymethyl methacrylate macroinitiator. Methyl methacrylate (MMA), initiator 2-bromoethyl isobutyrate (EBiB), catalyst cuprous chloride (CuCl) / pentamethyl divinyl triamine (PMDETA), the molar ratio of the four substances is 50:1:2:1~150:1:2:1, mixed and placed in a three-necked flask, using tetrahydrofuran as solvent for solution polymerization, nitrogen protection, reaction temperature 50-65°C, reaction time 4-6h. After the reaction, the solution was passed through a neutral alumina column to remove copper ions, and then precipitated with methanol to obtain a white solid, which was dried in a vacuum drying oven at 40°C to a constant weight, which is a macromolecule of polymethyl methacrylate (PMMA) Initiator, the number average molecular weight measured by gel permeation chromatography (GPC) is 1.578×10 4 , The molecular weight distribution is 1.12.

[0023] Step 2: Preparation of the diblock copolymer polymethyl methacrylate-polystyrene. Styrene,...

Embodiment 2

[0025] Example 2: The second example of PMMA-b-1PS-based gel electrolyte:

[0026] Step 1 and Step 2 are the same as Example 1, except that the diblock copolymer PMMA-b-1PS added in Step 3 is 0.40g; the lithium salt plasticizer solution added is 0.6g, and the polymer mass fraction It is 40wt%.

Embodiment 3

[0027] Example 3: The third example of PMMA-b-1PS-based gel electrolyte:

[0028] Step 1 and Step 2 are the same as Example 1, except that the diblock copolymer PMMA-b-1PS added in Step 3 is 0.45g; the lithium salt plasticizer solution added is 0.55g, and the polymer mass fraction is It is 45wt%.

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Abstract

The invention relates to a lithium ion gel electrolyte based on a polymethyl methacrylate-polystyrene diblock copolymer, and a preparation method thereof. The technical scheme is characterized in that: the diblock copolymer comprises: 0.35-0.45 g of a polymer matrix, 0.55-0.65 g of a mixture, wherein the mixture comprises a plasticizer and a lithium salt, the concentration of the lithium salt in the plasticizer is 1 mol / L. The polymer matrix is the polymethyl methacrylate-polystyrene diblock copolymer synthesized by an atom transfer radical polymerization method. According to the present invention, the electrolyte system has good ionic conductivity; the required conditions by the preparation process are simple, and can be achieved by the ordinary laboratory, such that the method of the present invention is the method for preparing the gel electrolyte, wherein the method has characteristics of directness, simpleness, broad-applicability, and simple operation process.

Description

Technical field [0001] The invention relates to a lithium ion gel electrolyte based on two-block polymethyl methacrylate-polystyrene copolymer and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of high-energy environmentally friendly battery. Compared with traditional nickel-metal hydride and nickel-cadmium batteries, lithium-ion batteries have important advantages such as high voltage, large specific energy, long cycle life, good safety performance, and fast charge and discharge. , Making it have broad application prospects in many aspects such as portable electronic equipment, electric vehicles, space technology, national defense industry, etc., and has become a research hotspot of widespread concern in recent years. Lithium-ion battery electrolytes can be divided into liquid electrolytes, all-solid polymer electrolytes (SPE) and solid-liquid composite electrolytes, gel polymer electrolytes (GPE) according to their existing states....

Claims

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Application Information

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IPC IPC(8): H01M10/0565C08F293/00
CPCY02E60/10
Inventor 马晓燕周华龙宋颖强秀
Owner NORTHWESTERN POLYTECHNICAL UNIV
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