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Method for preparing electrolyte of porous compound polymer doped by titanium dioxide through hydrolysis method in situ

A composite polymer, titanium dioxide technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems affecting the performance of composite electrolyte membranes, non-uniformity of electrolyte membranes, and high surface activity, and improve electrochemical performance and stability. , good composite effect, improve the effect of porous network structure

Inactive Publication Date: 2007-02-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since these two methods both use inorganic nano-powders as fillers, and nano-powder materials have high surface activity and are not easy to disperse, resulting in the inhomogeneity of the electrolyte membrane, which affects the performance of the composite electrolyte membrane.

Method used

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  • Method for preparing electrolyte of porous compound polymer doped by titanium dioxide through hydrolysis method in situ
  • Method for preparing electrolyte of porous compound polymer doped by titanium dioxide through hydrolysis method in situ
  • Method for preparing electrolyte of porous compound polymer doped by titanium dioxide through hydrolysis method in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Prepare tetrabutyl titanate dilution, weigh 0.141g tetrabutyl titanate and dissolve in 1ml tetrahydrofuran to obtain a light yellow solution;

[0020] (2) Prepare acetone mixed solution, mix 0.2g high-purity water, 0.05g 37% concentrated hydrochloric acid and 7.5ml acetone to obtain a transparent solution;

[0021] (3) Preparation of TiO 2 Sol, at 20°C, add the diluted solution of tetrabutyl titanate dropwise to the stirred acetone mixture to obtain TiO 2 white sol;

[0022] (4) Prepare composite casting solution, add 0.5g PVDF-HFP and 1.24ml n-butanol to TiO 2 In the white sol, heat up to 50°C and stir at constant temperature for 3h;

[0023] (5) Membrane making, after the polymer is fully dissolved, cool to 30°C while stirring, cast the milky white casting solution in a forming mold, and obtain a white porous composite polymer doped with titanium dioxide after the solvent and non-solvent are volatilized membrane;

[0024] (6) Activation, in a dry environment,...

Embodiment 2

[0027] (1) Prepare tetrabutyl titanate dilution, weigh 0.1128g tetrabutyl titanate and dissolve in 1ml tetrahydrofuran to obtain a light yellow solution;

[0028] (2) Prepare acetone mixed solution, mix 0.2g high-purity water, 0.05g 37% concentrated hydrochloric acid and 7.5ml acetone to obtain a transparent solution;

[0029] (3) Preparation of TiO 2 Sol, at 20°C, add the diluted solution of tetrabutyl titanate dropwise to the stirred acetone mixture to obtain TiO 2 white sol;

[0030] (4) Prepare composite casting solution, add 0.5g PVDF-HFP and 1.24ml n-butanol to TiO 2 In the white sol, heat up to 50°C and stir at constant temperature for 3h;

[0031] (5) Membrane making, after the polymer is fully dissolved, cool to 30°C while stirring, cast the milky white casting solution in a forming mold, and obtain a white porous composite polymer doped with titanium dioxide after the solvent and non-solvent are volatilized membrane;

[0032] (6) Activation, in a dry environment...

Embodiment 3

[0035] (1) Prepare tetrabutyl titanate dilution, weigh 0.0846g tetrabutyl titanate and dissolve in 1ml tetrahydrofuran to obtain a light yellow solution;

[0036] To prepare acetone mixture, mix 0.15g of high-purity water, 0.05g of 37% concentrated hydrochloric acid and 6ml of acetone to obtain a transparent solution;

[0037] (2) Preparation of TiO 2 Sol, at 20°C, add the diluted solution of tetrabutyl titanate dropwise to the stirred acetone mixture to obtain TiO 2 white sol;

[0038] (3) Prepare composite casting solution, add 0.5g PVDF-HFP and 0.925ml n-butanol to TiO 2 In the white sol, heat up to 50°C and stir at constant temperature for 3h;

[0039] (4) Membrane making, after the polymer is fully dissolved, cool to 30°C while stirring, cast the milky white film casting solution in a forming mold, and obtain a white porous composite polymer doped with titanium dioxide after the solvent and non-solvent are volatilized membrane;

[0040] (5) Activation, in a dry envir...

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Abstract

This invention relates to an in-situ hydrolysis method for preparing TiO2-doped porous composite polymer electrolyte for Li-ion batteries. The method comprises: (1) dropping diluted tetrabutyl titanate (TBT) solution into mixed acetone solution under stirring to obtain white TiO2 sol; (2) adding PVDF-HFP and n-butanol into white TiO2 sol, heating to 40-60 deg.C and stirring for 2-4 h; (3) preparing TiO2-doped porous composite polymer membrane, and immersing in Li-ion battery electrolytic solution to obtain ion-conductive electrolyte membrane. The method improves the porous network strcture of the electrolyte membrane, and TiO2 is uniformly distributed without forming aggregates. Besides, TiO2 is closely linked with the polymer matrix, thus improving the electrochemical and mechanical properties of the electrolyte membrane.

Description

technical field [0001] The invention relates to a preparation method of a polymer electrolyte, in particular to the preparation of a polymer lithium ion battery electrolyte. Background technique [0002] Polymer electrolyte membrane is the key material of polymer lithium-ion batteries. As the separator and electrolyte of lithium-ion batteries, polymer electrolyte membranes should have high room temperature ionic conductivity, good electrode interface stability, and wide electrochemical stability. window and good mechanical properties. At present, polymer electrolytes can be divided into three types according to their structure: pure solid polymer electrolyte (DSPE), gel polymer electrolyte (GSPE) and porous polymer electrolyte (PSPE). The ionic conductivity of DSPE electrolyte is low, the highest value is at 10 -5 ~10 -4 S cm -1 The order of magnitude cannot meet the requirements of lithium-ion batteries. The ionic conductivity of both GSPE and PSPE electrolytes can rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/20C08J5/18C08J7/00C08K3/22H01M10/40H01M10/0568
CPCY02E60/122Y02E60/10
Inventor 王新东刘伯文朱中正
Owner UNIV OF SCI & TECH BEIJING
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