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Polyimide non-woven fabric-based safe gel electrolyte material and preparation method thereof

A technology of gel electrolyte and polyimide, applied in solid electrolyte, non-aqueous electrolyte, circuit, etc., can solve problems such as low temperature resistance, poor safety, and volatile electrolyte, so as to improve heat resistance stability, high Capacity retention rate, good working effect

Active Publication Date: 2020-04-03
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above problems, the purpose of the present invention is to prepare a new type of polyimide nonwoven fabric with active hydroxyl sites from a synthetic point of view, and to prepare a new type of safe gel electrolyte material on this basis to ensure the safety of lithium batteries. Under the premise of stability, improve the energy density of the battery, expand its operating temperature range, and improve the charge / discharge rate and cycle performance of the battery, so as to solve the problem of poor safety of the existing lithium-ion power battery, volatile electrolyte, low temperature resistance, and battery separator. The problem of easy deformation, contraction, fire and combustion

Method used

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  • Polyimide non-woven fabric-based safe gel electrolyte material and preparation method thereof
  • Polyimide non-woven fabric-based safe gel electrolyte material and preparation method thereof
  • Polyimide non-woven fabric-based safe gel electrolyte material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of polyimide non-woven fabric with tetramethoxy pendant groups

[0032] Prepare tetramethoxybenzidine and bistrifluoromethyldiphthalic anhydride into a polyamic acid NMP solution with a mass fraction of 5%, and adjust the electrospinning equipment parameters to prepare it to have a porosity of 55% to 70% , Polyamic acid non-woven fabric with an average pore diameter of 0.5 to 1.5 μm. Further, the prepared polyamic acid non-woven fabric is heated at 350-500°C for 4-6 hours, and finally a polyimide non-woven fabric material with methoxy side groups is obtained

Embodiment 2

[0033] Example 2: Preparation of polyimide non-woven fabric with hydroxyl active sites

[0034] The methoxy side group non-woven fabric prepared in Example 1 is soaked in 1M boron tribromide solution or pyridine hydrochloride solution for demethylation, ensuring that the amount of demethylation reagent is at least 5 times larger The molar content of methoxy groups in the non-woven fabric. Keep the reaction temperature at 0-20°C, take out the material after 24 hours of reaction, and rinse the material with a large amount of deionized water, quench the reaction reagents until the product becomes neutral, and dry it for later use

Embodiment 3

[0035] Example 3: Preparation of electrolyte

[0036] A: Take tetraethylene glycol dimethyl ether (TEGDME) and γ-butyrolactone to prepare a mixed solution at a mass ratio of 1:1, and then add lithium perchlorate to prepare a 1.5M electrolyte for use.

[0037] B: Take ethylene carbonate (EC) and γ-butyrolactone to prepare a mixed solution with a mass ratio of 6:4, and then add LiTFSI to finally prepare a 1M electrolyte for use.

[0038] C: Take propylene carbonate (PC) and tetraethylene glycol dimethyl ether (TEGDME) into a mixed solution at a mass ratio of 4:6, and then add lithium hexafluorophosphate to finally prepare a 2M electrolyte for use.

[0039] D: Take propylene carbonate (PC) and ethylene carbonate (EC) to prepare a mixed solution at a mass ratio of 5:5, and then add lithium tetrafluoroborate to finally prepare a 1.5M electrolyte for use.

[0040] E: Take propylene carbonate (PC) and diethylene glycol dimethyl ether according to the mass ratio of 4:6 to prepare a mixed soluti...

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Abstract

The invention discloses a polyimide non-woven fabric based safe-type gel electrolyte material and a preparation method thereof. The preparation method comprises the following steps: firstly synthesizing polyimide non-woven fabric (PI-NW) with a methoxyl lateral group, through demethylation processing, to obtain the PI-NW of which a structural framework is provided with a hydroxyl active site; introducing electrolyte in high boiling point and high flash point as an ion transmission medium, and introducing a multi-functional group active monomer, through photo-induced polymerization or thermal-induced crosslinking, enabling a material to form a uniform body, and limiting volatilization of the electrolyte, thereby improving the heat-resisting stability. The material is used as a battery diaphragm. Under the precondition of guaranteeing the safety of a lithium battery, the energy density of the battery is improved, a usage temperature interval of the battery is expanded, and the charging / discharging multiplying power and the circulating performance of the battery are improved, so problems of the existing lithium ion power battery that the safety is poor, the electrolyte is easy to volatilize, the battery is not high-temperature-resistant, and the battery diaphragm is easily deformed and shrunk for burning are solved.

Description

Technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a polyimide non-woven fabric (PI-NW)-based safety gel electrolyte material suitable for lithium ion secondary batteries and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have high-power and high-current discharge capabilities and high energy density, and have been widely used in the field of new energy power batteries. At present, major power battery manufacturers mainly use 18650 cylindrical steel shell batteries or square aluminum-plastic film soft pack batteries as batteries, and the positive active materials mainly use lithium iron phosphate, lithium cobalt oxide, ternary nickel cobalt manganese oxide and ternary nickel Lithium cobalt aluminate is mainly used. However, power batteries use a large number of organic electrolytes that are extremely flammable and explosive, and the integrated battery packs often have high saf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 李贵彬郑俊荣陈继涛许铃鸿
Owner PEKING UNIV
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