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Composite polymer electrolyte and preparation method and application thereof

A composite polymer and electrolyte technology, applied in the field of electrolytes, can solve the problems of affecting the energy efficiency of batteries, reducing the energy efficiency of lithium-ion batteries, and the low number of lithium-ion migration

Inactive Publication Date: 2017-06-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because in the secondary battery, on the one hand, the migration of anions will lead to the consumption of battery energy; on the other hand, because the migration speed of anions is faster than that of lithium ions, it will cause a concentration gradient of electrolyte salt during charging and discharging, resulting in Concentration polarization, which reduces the energy efficiency of Li-ion batteries
In the existing electrolyte system, the migration number of lithium ions is low (<0.3), which greatly affects the energy efficiency of the battery

Method used

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  • Composite polymer electrolyte and preparation method and application thereof
  • Composite polymer electrolyte and preparation method and application thereof
  • Composite polymer electrolyte and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0049] Add 9mL of tetraethyl orthosilicate to 91mL of absolute ethanol at room temperature, then quickly add a mixture of 49.5mL of water, 18mL of 14mol / L ammonia water, 32.5mL of absolute ethanol and 0.6180g of boric acid, and stir at a speed of 200r / min After reacting for 3 hours, a boron-containing silica particle dispersion was obtained, and the silica particle was about 500 nm in size. The silicon dioxide particle dispersion is centrifuged and dried to obtain silicon dioxide powder. The powder is calcined in a muffle furnace at a high temperature of 500° C. for 6 hours to obtain calcined boron-containing silica microsphere powder.

[0050] figure 1 Infrared spectra of boron-containing silica used in Example 1 before and after calcination and ordinary silica. The characteristic peak of boron-containing silica before calcination is: 1638cm-1 H-OH bending vibration; 936cm -1 Si-OH; 1408cm -1 B-O stretching vibration; 1108 (1120-1020) cm -1 Si-O. 798,473cm -1 Si-O-Si. ...

Embodiment 2

[0060] Aluminum isopropoxide is dissolved in isopropanol to make aluminum alkoxide phase; deionized water, nitric acid and isopropanol are mixed to make water phase. The aluminum alkoxide phase and the water phase are simultaneously added dropwise into a reaction vessel filled with isopropanol, stirred, and the aluminum isopropoxide is hydrolyzed. Sodium tetraborate was then added. The gel is dried to form hydrated alumina, and then calcined at 750°C to obtain boron-containing alumina powder, the powder is about 10nm.

[0061] Add 0.5g of boron-containing alumina powder with a particle size of 10nm to 9.5g of 1-methyl-2-pyrrolidone solution of polyacrylonitrile with a concentration of 10wt.%. After stirring for 1 hour, the polymer solution Apply to stainless steel, evaporate solvent. Immerse the polymer solid film in the electrolyte (1mol / l LiClO 4 EC solution) after 10 min, the polymer electrolyte was obtained. The obtained polymer electrolyte was fixed in the middle of t...

Embodiment 3

[0063] Stir vigorously under an ice-water bath, drop titanium tetrachloride into distilled water, add dropwise an aqueous solution dissolved in ammonium sulfate and concentrated hydrochloric acid into the obtained titanium tetrachloride solution, stir, and control the temperature of the mixing process below 15°C. Lithium tetraborate was then added, and the temperature was raised to 95° C. for 1 hour, and then concentrated ammonia water was added to adjust the pH value to about 6. Cool to room temperature and age for 12 hours to obtain boron-containing titanium dioxide particle dispersion, the titanium dioxide particle size is about 5nm. The titanium dioxide ion dispersion liquid is filtered, washed, dried, and then placed in a muffle furnace for calcination at a high temperature of 500° C. for 6 hours to obtain calcined boron-containing titanium dioxide powder.

[0064] 0.1 g of boron-containing titanium dioxide was added to 4.9 g of 20 wt.% polymethyl methacrylate in acetone ...

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Abstract

The invention discloses a composite polymer electrolyte and a preparation method and application thereof and relates to electrolytes. The composite polymer electrolyte comprises a polymer matrix and a boron-containing inorganic oxide. The preparation method of the composite polymer electrolyte includes a direct addition method and an in-situ polymerization method, wherein the direct addition method includes the steps of dissolving and dispersing the polymer matrix and the boron-containing inorganic oxide into a solvent to obtain a solution A, applying the solution A on the polymer matrix, volatilizing the solvent, and immersing an obtained polymer film into an electrolyte solution so as to obtain the composite polymer electrolyte; the in-situ polymerization method includes the steps of dissolving and dispersing the polymer matrix and the boron-containing inorganic oxide into a solvent, adding an initiator, feeding N2 to eliminate air, conducting a polymerization reaction to obtain a solution B, applying the solution B on the polymer matrix, volatilizing the solvent, and immersing an obtained polymer film into an electrolyte solution so as to obtain the composite polymer electrolyte. The composite polymer electrolyte can be applied to preparation of batteries.

Description

technical field [0001] The invention relates to electrolytes, in particular to a composite polymer electrolyte and its preparation method and application. Background technique [0002] Lithium-ion secondary battery is a green power system developed in the 1990s. Compared with traditional secondary power sources such as lead-acid batteries and nickel-cadmium batteries, it has high input voltage, high energy density, and good cycle performance. No memory effect, environment friendly and so on. Lithium-ion secondary batteries generally use lithium intercalation compounds as positive and negative electrode materials, and non-aqueous electrolytes in which lithium salts are dissolved in organic solvents as electrolytes. In this liquid electrolyte system, flammable carbonates are mostly used as organic solvents, and there are factors such as liquid leakage and unsafety in the long-term charging and discharging process, which has become a key problem restricting the development of ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0065Y02E60/10Y02P70/50
Inventor 张鹏赵金保戴建辉
Owner XIAMEN UNIV
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