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Preparation method of high-safety lithium ion battery diaphragm and preparation of total battery

A lithium-ion battery and separator technology, applied in the field of new energy batteries, can solve the problems of flammability, volatility, poor safety, etc.

Active Publication Date: 2018-08-14
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a method for preparing a high-safety lithium-ion battery diaphragm to solve the problems of flammability, volatility and poor safety in commercial electrolyte systems, and to form a preparation method for full batteries

Method used

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  • Preparation method of high-safety lithium ion battery diaphragm and preparation of total battery
  • Preparation method of high-safety lithium ion battery diaphragm and preparation of total battery
  • Preparation method of high-safety lithium ion battery diaphragm and preparation of total battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Preparation of polyaryletherketone material

[0034]

[0035] Feed bisphenol monomers containing allyl double bonds, difluorobenzophenone (or dichlorobenzophenone) and other bisphenol monomers into a three-necked flask at a molar ratio of 3:5:2, and simultaneously add Dimethyl sulfoxide (DMSO) or N-methylpyrrolidone with a mass ratio of 1.2 times is used as a solvent, toluene with a mass ratio of 0.3 to 0.5 times is used as a water carrier, and potassium carbonate with a molar ratio of 1.1 to 1.4 times that of dihalogenated benzophenone As a salt-forming agent, the temperature of the system was gradually raised to 160°C for 5 hours to react stably for 5 hours, until the system became viscous and uniform, and the reaction product was discharged into deionized water and washed repeatedly until the pH value was Neutral, dry the material for later use.

Embodiment 2

[0036] Embodiment 2: Preparation of polyaryletherketone nonwoven fabric

[0037] Dissolve the material prepared in Example 1 in organic solvents such as tetrahydrofuran, or 1,4-dioxane, or dimethylformamide, and prepare a homogeneous solution with a mass fraction of 10% or 20%. Electrospinning Silk machine made nonwoven materials, see figure 2 with image 3 .

[0038] Electrospinning machine parameter setting: set positive and negative electrode electrostatic voltage 10KV ~ 15KV, spinning rate 2mL / min, roller receiving speed 200 ~ 400r / min, distance between nozzle and roller 15cm ~ 30cm. By specifically adjusting the above parameters, non-woven materials with different fiber diameters (1 μm-3 μm), different liquid absorption rates (50%-80%), and different mechanical strengths can be obtained. The finally obtained non-woven material was dried at 60° C. under vacuum for 24 hours, and kept for future use.

Embodiment 3

[0039] Example 3: Preparation of Gel Electrolyte Containing Flexible Side Chain Structure Crosslinked Polymer

[0040] Based on the polyaryletherketone nonwoven material prepared in Example 2, polyethylene glycol acrylate and commercial lithium ion electrolyte were mixed according to the mass ratio of 40:60, and 1% of curing agent was added, and the mixed The system is added to the non-woven fabric according to a certain mass ratio, and is cured by ultraviolet light or heat to finally prepare a cross-linked polymer gel electrolyte diaphragm material containing flexible side chains. The reaction formula and the structure of the cross-linked polymer that contains flexible PEG (polyethylene glycol) side chains are prepared as follows:

[0041]

[0042] k 2 = 4 or 6, k 1 is a positive integer greater than 1.

[0043] At the same time, the fire resistance test was carried out on the material, such as Figure 4 As shown, the gel electrolyte separator and the liquid electrolyt...

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Abstract

The invention discloses a preparation method of a high-safety lithium ion battery diaphragm and a preparation scheme of a total battery. According to the preparation method, a novel polyaryletherketone high polymer material with an active reaction group is prepared, and then the material is prepared into non-woven fabric through an electrospinning technique to be used as a polymer framework, so that the mechanical performance and heat resistance of the diaphragm are improved; through photo initiation or thermal initiation curing, a flexible side chain structure is introduced to the rigid polymer framework, so that electrolyte absorption capability and lithium ion conduction capability of the diaphragm are improved; and a diaphragm curing reaction is performed on a metal lithium sheet or agraphite negative electrode, so that the contact surface between the diaphragm and the metal lithium surface can be enlarged, and formation of lithium dendritic crystal is suppressed and decelerated.The whole battery preparation scheme provided by the invention has the characteristics of no expansion at a temperature of 80 DEG C and high cycle stability (0.5C and 200 cycles), and is expected to be the improved scheme of the high-safety lithium ion battery diaphragm to be applied to a lithium ion secondary battery or a lithium metal secondary battery.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a high-safety lithium ion battery diaphragm, a preparation method thereof, and a full battery preparation scheme. Background technique [0002] Lithium-ion secondary batteries have high energy density, high rate charging rate and long cycle life, and are widely used in various energy storage devices and as a power source for electric vehicles. At present, lithium metal oxides are mainly used as positive electrode materials. The mainstream products include lithium iron phosphate, lithium cobalt oxide, lithium nickel cobalt manganese oxide, and lithium nickel cobalt aluminate. Graphite is mainly used as negative electrode materials. There are also many reports on the use of metal lithium as the negative electrode; the separator is mainly biaxially stretched porous PP film, and the electrolyte is mostly LiFP 6 organic electrolytes. With the continuous improvement of s...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M2/14H01M2/16H01M10/058H01M10/0525H01M10/42C08G65/40D04H1/4326D04H1/728D01D5/00H01M50/403H01M50/414
CPCH01M10/0525H01M10/0565H01M10/058H01M10/4235D01D5/003D01D5/0076D01D5/0092D04H1/4326D04H1/728C08G65/4012H01M50/403H01M50/411Y02E60/10Y02P70/50
Inventor 李贵彬陈忻陈继涛郑俊荣
Owner PEKING UNIV
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