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Self-plasticized fluoropolymer lithium ion conductor, its preparation method and application

A polymer, self-plasticizing technology, applied in the field of polymer material technology and lithium batteries, can solve the problems of dispersion and interaction between polyoxyethylene materials and lithium salts that are rarely considered

Active Publication Date: 2019-07-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, through the study of a large number of polymer solid electrolytes reported in the literature, we found that most of the current research on polymer solid electrolytes has focused on the crystallinity of polyoxyethylene materials, and little consideration has been given to the crystallinity of polyoxyethylene materials. Dispersion and interaction with lithium salt

Method used

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  • Self-plasticized fluoropolymer lithium ion conductor, its preparation method and application
  • Self-plasticized fluoropolymer lithium ion conductor, its preparation method and application
  • Self-plasticized fluoropolymer lithium ion conductor, its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0050] In this embodiment, the fluorine-containing polymer lithium ion conductor is a fluorine-containing polyetheretherketone resin (Li type) with side chain grafted PEGMe2000, and its synthetic reaction route is as follows figure 1 As shown, the details are as follows:

[0051] Step 1: Synthesis of potassium salt of p-carboxybenzenesulfo-(5-iodo-3-oxa-octafluoropentyl)sulfonylimide (ICF 2 CF 2 OCF 2 CF 2 SO 2 NKSO 2 ArCOOH)

[0052] Add 50ml of deionized water, 0.01mol of p-carboxybenzenesulfonamide, 0.02mol of potassium hydroxide, and 0.01mol of potassium carbonate into a 250ml three-necked flask, and mix well; when the temperature returns to room temperature, add 0.0005mol of octadecadecrown ether, stir and dissolve , 50 ml of toluene solution in which 0.01 mol of 5-iodo-3-oxa-octafluoropentylsulfonyl fluoride monomer was dissolved was added dropwise, and reacted for 0.5 hmin under stirring at 1000 rpm.

[0053] The reaction product was separated from the water phas...

Embodiment 2

[0063] Step 1: Synthesis of (4-potassium carboxylate-3-oxa-hexafluorobutyl)-sulfo-(5-iodo-3-oxa-octafluoropentyl)sulfonylimide potassium salt (ICF 2 CF 2 OCF 2 CF 2 SO 2 NKSO 2 CF 2 CF 2 OCF 2 COOK)

[0064] Add 50ml acetonitrile in 250ml there-necked flask, 0.01mol4-carboxy-3-oxa-hexafluorobutylsulfonamide (N 2 SO 2 CF 2 CF 2 OCF 2 COOH), 0.04mol of anhydrous potassium carbonate were mixed uniformly and heated to 60°C, and 0.01mol of 5-iodo-3-oxa-octafluoropentylsulfonyl fluoride monomer (ICF 2 CF 2 OCF 2 CF 2 SO 2 F) Reaction for 6h.

[0065] After the mixture was filtered, the mother liquor was rotary evaporated to remove acetonitrile, and the obtained yellow-white solid was recrystallized with deionized water to obtain the product ICF 2 CF 2 OCF 2 CF 2 SO 2 NKSO 2 CF 2 CF 2 OCF 2 COOK.

[0066] Step 2: Synthesis of fluorine-containing sulfonimide grafted polysulfone with carboxyl groups

[0067] Dissolve 5g of polysulfone with a bromine content ...

Embodiment 3

[0075] Step 1: Synthesis of potassium salt of (4-carboxymethyl-3-oxa-hexafluorobutyl)-sulfo-(5-iodo-3-oxa-octafluoropentyl)sulfonylimide (ICF 2 CF 2 OCF 2 CF 2 SO 2 NKSO 2 CF 2 CF 2 OCF 2 COOCH 3 )

[0076] Add 50ml acetonitrile in 250ml there-necked flask, 0.01mol4-carboxy-3-oxa-hexafluorobutylsulfonamide (H 2 NSO 2 CF 2 CF 2 OCF 2 COOCH 3 ), 0.04mol of anhydrous potassium carbonate, mix uniformly and heat up to 60°C, add 0.01mol of 5-iodo-3-oxa-octafluoropentylsulfonyl fluoride monomer (ICF 2 CF 2 OCF 2 CF 2 SO 2 F) Reaction for 6h.

[0077] After the mixture was filtered, the mother liquor was rotary evaporated to remove acetonitrile, and the obtained yellow-white solid was recrystallized with deionized water to obtain the product ICF 2 CF 2 OCF 2 CF 2 SO 2 NKSO 2 CF 2 CF 2 OCF 2 COOCH 3 .

[0078] Step 2: Synthesis of fluorine-containing sulfonimide grafted polystyrene with carboxyl groups

[0079] Dissolve 5g of polystyrene with a bromine co...

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Abstract

The invention provides a self-plasticizing fluorine-containing polymer lithium ion conductor. The conductor comprises an aromatic polymer main chain and side chain fluorine-containing organic lithiumsalt, and a chain polyoxyethylene derivative tail end connected with the organic lithium salt, and as a polymer framework, lithium salt and a polyether chain segment serving as a dissolving medium arecombined in a chemical bond manner, and the lithium salt and the dissolving medium are in sufficient contact with each other and are interacted, the lithium salt can be furthest dissociated, and theconductivity is improved. The conductor can serve as novel all-solid-state polymer electrolyte to be applied to a lithium ion battery, so as to solve the problem that the current all-solid-state lithium ion battery cannot be applied at a room temperature because the conductivity is too low.

Description

technical field [0001] The invention relates to the fields of polymer material technology and lithium batteries, in particular to a self-plasticized fluorine-containing polymer lithium ion conductor, its preparation method and application. Background technique [0002] In the past ten years, lithium-ion batteries have been more and more widely used in various fields of human society. From the initial low-power electronic products such as mobile phones and watches, they have gradually entered the field of larger-scale energy storage, such as power batteries, building emergency power supply etc. Under this trend, the voltage, charge and discharge speed, power density, and stacking density of lithium batteries are also becoming higher and higher with the scale requirements. At the same time, large charge and discharge current or high stacking density doubles the heat accumulation of the battery pack. Currently, widely used liquid electrolytes and semi-liquid electrolytes are ...

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 薛立新聂锋温乐乐
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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