Process for preparing hybridized porous lithium ion cell electrolyte film

A lithium-ion battery and electrolyte membrane technology, which is applied in the field of preparation of polymer electrolytes, can solve problems such as unexplained distribution characteristics of composite electrolyte membranes, achieve good hybridization effects, avoid phase separation, and improve ion conductivity

Inactive Publication Date: 2007-04-11
UNIV OF SCI & TECH BEIJING
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  • Claims
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Problems solved by technology

The experimental results show that the in-situ doping of nano-SiO 2 After that, the ionic conductivity of the composite electrolyte membrane reached 1.6 mS cm -1 The stability of the interface with the lithium electrode is improved, but the paper does not explain the SiO in the composite electrolyte membrane 2 The distribution characteristics of

Method used

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  • Process for preparing hybridized porous lithium ion cell electrolyte film
  • Process for preparing hybridized porous lithium ion cell electrolyte film
  • Process for preparing hybridized porous lithium ion cell electrolyte film

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) Prepare PVDF-HFP solution, weigh 0.5g PVDF-HFP and dissolve 6g in acetone, prepare PVDF-HFP colorless and transparent solution;

[0021] (2) Prepare tetrabutyl titanate solution, weigh 0.1128g tetrabutyl titanate and dissolve in 2.5g n-butanol, prepare tetrabutyl titanate light yellow solution;

[0022] (3) To adjust the pH value of the PVDF-HFP solution, add 0.2ml of 0.1mol / L hydrochloric acid solution dropwise to the PVDF-HFP solution;

[0023] (4) Prepare a composite casting solution. At 20° C., add the above-mentioned light yellow solution of tetrabutyl titanate dropwise to the stirred PVDF-HFP solution to gradually obtain a white mixed solution, raise the temperature to 50° C., and stir at a constant temperature for 6 hours. Obtain a viscous white uniform casting solution;

[0024] (5) Forming a film, cooling to 25°C while stirring, casting the white casting liquid in a forming mold, and obtaining TiO after the solvent and non-solvent volatilize 2 / PVDF-HFP h...

Embodiment 2

[0028] (1) Prepare PVDF-HFP solution, take 0.5g PVDF-HFP and dissolve 6g in acetone, prepare PVDF-HFP colorless and transparent solution;

[0029] (2) prepare tetrabutyl titanate solution, weigh 0.1128g tetrabutyl titanate and dissolve in 1.5g n-butanol, prepare tetrabutyl titanate pale yellow solution;

[0030] (3) To adjust the pH value of the PVDF-HFP solution, add 0.2ml of 0.1mol / L hydrochloric acid solution dropwise to the PVDF-HFP solution;

[0031] (4) Prepare a composite casting solution. At 20° C., add the above-mentioned light yellow solution of tetrabutyl titanate dropwise to the stirred PVDF-HFP solution to gradually obtain a white mixed solution, raise the temperature to 60° C., and stir at a constant temperature for 6 hours. Obtain a viscous white uniform casting solution;

[0032](5) Forming a film, cooling to 25°C while stirring, casting the white casting liquid in a forming mold, and obtaining TiO after the solvent and non-solvent volatilize 2 / PVDF-HFP hybr...

Embodiment 3

[0036] (1) Prepare PVDF-HFP solution, weigh 0.5g PVDF-HFP and dissolve 6g in acetone, prepare PVDF-HFP colorless and transparent solution;

[0037] (2) prepare tetrabutyl titanate solution, weigh 0.3807g tetrabutyl titanate and dissolve in 2g n-butanol, prepare tetrabutyl titanate pale yellow solution;

[0038] (3) To adjust the pH value of the PVDF-HFP solution, add 0.15ml of 0.1mol / L hydrochloric acid solution dropwise to the PVDF-HFP solution;

[0039] (4) Prepare a composite casting solution. At 20° C., add the above-mentioned light yellow solution of tetrabutyl titanate dropwise to the stirred PVDF-HFP solution to gradually obtain a white mixed solution, raise the temperature to 40° C., and stir at a constant temperature for 8 hours. Obtain a viscous white uniform casting solution;

[0040] (5) Forming a film, cooling to 25°C while stirring, casting the white casting liquid in a forming mold, and obtaining TiO after the solvent and non-solvent volatilize 2 / PVDF-HFP hyb...

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Abstract

The present invention is process of preparing hybridized porous electrolyte film for lithium ion cell, and relates to lithium ion cell electrolyte preparing technology. The present invention proposes sol-gel process to realize inorganic nanometer doping of polymer in molecule level and phase transfer process to prepare hybridized porous electrolyte film of titania and vinylidene fluoride-hexafluoro propylene copolymer. The hybridized porous electrolyte film has inorganic phase dispersed in nanometer size inside organic phase, improved porous network structure and the organic combination between the inorganic phase and the organic phase. The hybridized porous electrolyte film possesses obviously raised electrochemical performance, stability, etc.

Description

technical field [0001] The invention relates to a preparation method of a polymer electrolyte, in particular to the preparation of an organic-inorganic hybrid electrolyte for a polymer lithium ion battery. Background technique [0002] Compared with ordinary liquid lithium-ion batteries, polymer lithium-ion batteries using polymer electrolyte membranes as separators and electrolytes have significantly improved battery specific energy, safety, and structural design. As the separator and electrolyte of polymer lithium-ion batteries, polymer electrolyte membranes should have high room temperature ionic conductivity, good electrode interface stability, wide electrochemical window and good mechanical properties. According to the structure, polymer electrolytes can be divided into three categories: pure solid polymer electrolytes (DSPE), gel polymer electrolytes (GSPE) and porous polymer electrolytes (PSPE). At present, the ionic conductivity of DSPE electrolyte is in the range o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08J5/18H01M10/40H01M10/0565
CPCY02E60/122Y02E60/10
Inventor 王新东刘伯文朱中正
Owner UNIV OF SCI & TECH BEIJING
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