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Organic/inorganic composite electrolyte and preparation method thereof

An inorganic composite and electrolyte technology, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve problems such as weakening, and achieve the effects of improving dispersion, easy molding and processing, and improving comprehensive performance.

Inactive Publication Date: 2014-01-15
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these inorganic nanoparticles have high specific surface energy and are easy to agglomerate in polymers, which weakens the role of nanoparticles in polymers in improving lithium ion conductivity and stabilizing interfaces.

Method used

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  • Organic/inorganic composite electrolyte and preparation method thereof
  • Organic/inorganic composite electrolyte and preparation method thereof
  • Organic/inorganic composite electrolyte and preparation method thereof

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preparation example Construction

[0054] The preparation method of γ-lithium metaaluminate is as follows:

[0055] A certain proportion of nano-lithium carbonate and nano-alumina are dispersed in ethanol at a certain solid content, ball milled for 24 hours, dried, and sintered in a muffle furnace at 1000°C to obtain the required γ-lithium metaaluminate.

[0056] The modification method of γ-lithium metaaluminate is as follows:

[0057] 1) Add self-made lithium metaaluminate into hydrogen peroxide and soak for 5 to 48 hours, wash away the hydrogen peroxide, and dry to obtain oxidized lithium metaaluminate.

[0058] 2) Mix the oxidized lithium metaaluminate with the silane coupling agent vinyltrimethoxysilane (A-171) and toluene, and react under reflux for 2 to 48 hours. The unreacted silane coupling agent is washed away with ethanol, filtered and dried to obtain a modified inorganic solid electrolyte.

[0059] Among them, the raw materials used above: lithium carbonate: Aladdin Reagent Co., Ltd.; nano-alumina...

Embodiment 1

[0073] (1) 1 g of polyoxyethylene-polystyrene block copolymer (number average molecular weight 240,000, oxyethylene repeating unit mass percentage 12.1%) was dissolved in chloroform to obtain solution 1;

[0074] (2) Weigh 0.0632 g of lithium bistrifluoroimide sulfonate according to the ratio of lithium salt to oxyethylene repeating unit 0.08:1 and dissolve it in tetrahydrofuran to obtain solution 2;

[0075] (3) Add solution 2 to solution 1 and stir for 24 hours to obtain solution 3;

[0076] (4) Then add 0.03g of modified lithium metaaluminate to solution 3, mechanically stir (rotating speed 350rpm) for 48 hours to make the system mix uniformly, remove all solvents, and obtain organic / inorganic composite electrolyte;

[0077] (5) The obtained organic / inorganic composite electrolyte is made into a 10% N-methylpyrrolidone solution and cast on a silicon wafer, and the solvent is removed at 60° C. to obtain an organic / inorganic composite electrolyte membrane with a thickness of ...

Embodiment 2

[0080] (1) 1 g of polyoxyethylene-polystyrene block copolymer (number average molecular weight 128,000, oxyethylene repeating unit mass percentage 29.3%) was dissolved in chloroform to obtain solution 1;

[0081] (2) Weigh 0.153 g of lithium bistrifluoroimide sulfonate according to the ratio of lithium salt to oxyethylene repeating unit 0.08:1, and dissolve it in tetrahydrofuran to obtain solution 2;

[0082] (3) Add solution 2 to solution 1 and stir for 24 hours to obtain solution 3;

[0083] (4) Then add 0.15 grams of modified lithium metaaluminate to the solution 3, mechanically stir (rotating speed 350rpm) for 48 hours to make the system mix uniformly, remove all solvents, and obtain an organic / inorganic composite electrolyte;

[0084] (5) The obtained organic / inorganic composite electrolyte is made into a 5% concentration of N-methylpyrrolidone solution and cast on a silicon wafer, and the solvent is removed at 60° C. to obtain an organic / inorganic composite electrolyte m...

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Abstract

The invention discloses an organic / inorganic composite electrolyte and a preparation method thereof. The organic / inorganic composite electrolyte is obtained by dispersing a lithium salt and a modified inorganic solid electrolyte into a polymer in a mixing manner, wherein the polymer contains an ethylene oxide repeating unit. The modification of the inorganic solid electrolyte is carried out for the first time; a polymer electrolyte and the inorganic electrolyte are effectively and evenly composited, so that the organic / inorganic composite electrolyte material is obtained. The dispersion of the inorganic solid electrolyte in the polymer is improved by the modification of the inorganic solid electrolyte, so that the adverse effect that the inorganic solid electrolyte is automatically gathered is avoided. The organic / inorganic composite electrolyte material obtained according to the preparation method has the advantages of the polymer electrolyte and the inorganic electrolyte, so that the comprehensive performance of the organic / inorganic composite electrolyte material is obviously improved. The organic / inorganic composite electrolyte material has practical value and can be popularized in lithium ion secondary batteries.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to an organic / inorganic composite electrolyte for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery has the characteristics of high energy density, high output voltage, no memory effect, and environmental friendliness. It is a green chemical power source with good economic benefits, social benefits and strategic significance. However, because lithium-ion batteries use flammable, volatile, and highly reactive organic liquid electrolytes, many safety issues have arisen. The current solution is to use solid or semi-solid electrolyte materials instead of organic liquid electrolytes, such as gel electrolytes, polymer solid electrolytes, and inorganic solid electrolytes. Among them, the inorganic solid electrolyte has the highest lithium ion conductivity, but it is not easy to process, and the interface resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058
CPCH01M10/056H01M10/058H01M2300/0091Y02E60/10Y02P70/50
Inventor 范少夫杨扬陈桥吴刚
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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