A preparation method of a 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 effect, improve porous network structure, and avoid phase separation

Inactive Publication Date: 2009-03-04
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A preparation method of a hybridized porous lithium ion cell electrolyte film
  • A preparation method of a hybridized porous lithium ion cell electrolyte film
  • A preparation method of a hybridized porous lithium ion cell electrolyte film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0021] (2) prepare tetrabutyl titanate solution, weigh 0.1128g tetrabutyl titanate and dissolve it in 2.5g n-butanol to prepare tetrabutyl titanate pale 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) To prepare a composite casting solution, at 20°C, the above-mentioned light yellow solution of tetrabutyl titanate was added dropwise to the stirred PVDF-HFP solution, and a white mixed solution was gradually obtained. A viscous white uniform casting liquid is obtained;

[0024] (5) Film making, cooling to 25°C while stirring, casting the white film casting liquid in the forming mold, and obtaining TiO after the solvent and non-solvent are volatilized 2 / PVDF-HFP hybrid porous membrane.

[0025] (6...

Embodiment 2

[0028] (1) To prepare a PVDF-HFP solution, weigh 0.5g of PVDF-HFP and dissolve 6g in acetone to prepare a colorless and transparent solution of PVDF-HFP;

[0029] (2) prepare tetrabutyl titanate solution, weigh 0.1128g tetrabutyl titanate and dissolve it in 1.5g n-butanol to 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) To prepare a composite casting solution, at 20°C, the above-mentioned light yellow solution of tetrabutyl titanate was added dropwise to the stirred PVDF-HFP solution, and a white mixed solution was gradually obtained. A viscous white uniform casting liquid is obtained;

[0032] (5) Film making, cooling to 25°C while stirring, casting the white film casting liquid in the forming mold, and obtaining TiO after the solvent and non-solvent are volatilized 2 / PVDF-HFP hybrid porous membrane.

[0033] (6) ...

Embodiment 3

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

[0037] (2) prepare tetrabutyl titanate solution, weigh 0.3807g tetrabutyl titanate and dissolve it in 2g n-butanol to 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) To prepare a composite casting solution, at 20°C, the above-mentioned light yellow solution of tetrabutyl titanate was added dropwise to the stirred PVDF-HFP solution, and a white mixed solution was gradually obtained. A viscous white uniform casting liquid is obtained;

[0040] (5) Film making, cooling to 25°C while stirring, casting the white film casting liquid in the forming mold, and obtaining TiO after the solvent and non-solvent are volatilized 2 / PVDF-HFP hybrid porous membrane.

[0041] (6)...

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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 polymer electrolyte, in particular to the preparation of organic and inorganic hybrid electrolyte of polymer lithium ion battery. Background technique [0002] Compared with ordinary liquid lithium-ion batteries, polymer lithium-ion batteries with polymer electrolyte membranes as separators and electrolytes have obvious improvements in 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 structural morphology, polymer electrolytes can be divided into three categories: pure solid polymer electrolytes (DSPE), gel polymer electrolytes (GSPE) and porous polymer electrolytes (PSPE). Currently, the ionic conductivity of DSPE electrolytes is in the...

Claims

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Application Information

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Patent Type & Authority Patents(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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