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PVDF-HFP composite lignocellulose gel polymer electrolyte membrane and preparation method thereof

A PVDF-HFP, lignocellulose technology, applied in the field of electrochemistry, can solve the problems of poor mechanical strength of electrolyte membrane, unsuitable for large-area production, unfavorable industrialization, etc., achieve high ionic conductivity and lithium ion migration number, and abundant reserves , the effect of conducive to industrialization

Inactive Publication Date: 2020-03-31
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte membrane prepared by electrospinning has poor mechanical strength, low liquid absorption rate, low preparation efficiency, long time, high energy consumption (requires high pressure), and is not suitable for large-scale production, which is not conducive to industrialization

Method used

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  • PVDF-HFP composite lignocellulose gel polymer electrolyte membrane and preparation method thereof
  • PVDF-HFP composite lignocellulose gel polymer electrolyte membrane and preparation method thereof
  • PVDF-HFP composite lignocellulose gel polymer electrolyte membrane and preparation method thereof

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Effect test

Embodiment 1

[0035] A preparation method of PVDF-HFP composite lignocellulose gel polymer electrolyte membrane, comprising the following steps:

[0036] (1) Preparation of lignocellulose suspension: weigh 600 mg of lignocellulose, add 80 mL of deionized water, and perform ultrasonic crushing at room temperature for 60 min to obtain a uniformly mixed suspension.

[0037] (2) Preparation of lignocellulose film: pour the suspension into a petri dish, and dry it in an oven at 70° C. for 12 hours.

[0038] (3) Preparation of PVDF-HFP solution: Weigh 1g of PVDF-HFP, measure 40mL of N,N-dimethylformamide (DMF), stir at room temperature for 12h, and obtain a transparent and uniform solution.

[0039] (4) Preparation of PVDF-HFP composite lignocellulose polymer electrolyte membrane: using the lignocellulose membrane as a substrate, using the PVDF-HFP solution for casting and casting, and placing the obtained separator in an oven at 70° C. for 10 h, The PVDF-HFP composite lignocellulose polymer ele...

Embodiment 2

[0042] A preparation method of PVDF-HFP composite lignocellulose gel polymer electrolyte membrane, comprising the following steps:

[0043] (1) Preparation of lignocellulose suspension: weigh 600 mg of lignocellulose, add 80 mL of deionized water, and perform ultrasonic crushing at room temperature for 60 min to obtain a uniformly mixed suspension.

[0044] (2) Preparation of lignocellulose film: pour the suspension into a petri dish, and dry it in an oven at 70° C. for 12 hours.

[0045](3) Preparation of PVDF-HFP solution: Weigh 1g of PVDF-HFP, measure 20mL of N,N-dimethylformamide (DMF), stir at room temperature for 24h, and obtain a transparent and uniform solution.

[0046] (4) Preparation of PVDF-HFP composite lignocellulose polymer electrolyte membrane: use the lignocellulose membrane as a base, use the PVDF-HFP solution to cast and cast a membrane, and place the obtained separator in an oven at 70°C to dry After 12 hours, the PVDF-HFP composite lignocellulose polymer ...

Embodiment 3

[0049] A method for preparing PVDF-HFP composite lignocellulose gel polymer electrolyte membrane, comprising the following steps:

[0050] (1) Preparation of lignocellulose suspension: Weigh 600 mg of lignocellulose, add 80 mL of deionized water, and perform ultrasonic crushing at room temperature for 40 min to obtain a uniformly mixed suspension.

[0051] (2) Preparation of lignocellulose film: pour the suspension into a petri dish, and dry it in an oven at 80° C. for 10 h.

[0052] (3) Preparation of PVDF-HFP solution: Weigh 1g of PVDF-HFP, measure 40mL of N,N-dimethylformamide (DMF), stir at room temperature for 20h, and obtain a transparent and uniform solution.

[0053] (4) Preparation of PVDF-HFP composite lignocellulose polymer electrolyte membrane: use the lignocellulose membrane as a substrate, use the PVDF-HFP solution to perform pressure spraying to form a film, and place the obtained diaphragm in an oven at 80°C to dry for 6 hours The PVDF-HFP composite lignocellu...

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Abstract

The invention relates to a preparation method of a PVDF-HFP composite lignocellulose gel polymer electrolyte membrane. The preparation method comprises the following steps: preparing a lignocellulosesuspension; preparing a lignocellulose membrane; a PVDF-HFP solution is prepared; a PVDF-HFP composite lignocellulose polymer electrolyte membrane is prepared; and preparing the PVDF-HFP composite lignocellulose gel polymer electrolyte membrane. According to the invention, a simple process is adopted; excellent physical and chemical properties of the two monomers are integrated; the PVDF-HFP composite lignocellulose polymer electrolyte membrane is prepared; the prepared polymer electrolyte membrane integrates excellent electrochemical properties of lignocellulose and PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene); meanwhile, the mechanical strength of the composite membrane is improved, in addition, compared with an organic liquid electrolyte which is universally applied at present, the gel polymer electrolyte membrane of PVDF-HFP composite lignocellulose has higher safety, and compared with a common polymer matrix at present, the gel polymer electrolyte membrane of PVDF-HFP composite lignocellulose also has higher ionic conductivity and lithium ion transference number.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a PVDF-HFP composite lignocellulose gel polymer electrolyte membrane and a preparation method thereof. Background technique [0002] With the remarkable development of portable electronic devices, there is an increasing demand for lithium-ion batteries (LIBs). Lithium-ion batteries have been widely used in many portable power devices such as mobile phones, digital cameras, and notebook computers because of their advantages such as higher output voltage, larger specific capacity, and longer cycle life. However, the volatile, flammable, and explosive organic electrolytes in lithium-ion batteries are still the main factors restricting the safety of lithium-ion batteries. Although liquid electrolytes have the advantages of low cost, high ionic conductivity, and good compatibility with electrodes, safety issues such as leakage, combustion, and explosion caused by liquid el...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0565
CPCH01M10/058H01M10/0565H01M2300/0088Y02E60/10Y02P70/50
Inventor 冯婷婷邓小华吴孟强陈治
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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