Polymer dispersion liquid and application thereof

A polymer and dispersion technology, applied in electrochemical generators, electrical components, circuits, etc., can solve problems such as battery performance degradation, and achieve the effect of protecting metal lithium and strong practicability

Active Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the formation of SEI requires the consumption of electrolyte, this will lead to rapid degradation of battery performance

Method used

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  • Polymer dispersion liquid and application thereof
  • Polymer dispersion liquid and application thereof
  • Polymer dispersion liquid and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 1 g of lithium bistrifluoromethanesulfonimide to 7.5 g of ethylene glycol dimethyl ether, and stir vigorously to obtain a clear electrolyte. Add 2.5 g of dioxolane and perfluorosulfonic acid resin therein, and heat to 70° C. to polymerize dioxolane into polydioxolane. It is still a transparent liquid after polymerization. A lithium / copper model battery was assembled using the polymer dispersion obtained above as an electrolyte. The lithium / copper model battery assembly method is as follows: put the stainless steel spring gasket, lithium sheet, electrolyte, Celgard2325 diaphragm, electrolyte, and pure copper foil discs into the 2016 button battery in sequence, and the amount of electrolyte dropped to 40uL, assemble the cell in an argon-filled glove box. The model battery is stamped and packaged with a press. The battery was tested in constant current charge and discharge mode. First control the capacity discharge, deposit 1mAh / cm on the surface of copper foil 2 ...

Embodiment 2

[0037] Add 1 g of lithium bisfluorosulfonimide to 7.5 g of polypropylene carbonate, and stir vigorously to obtain a clear electrolyte. 2.0 g of ethylene oxide was added therein, and the ethylene oxide was polymerized into polyethylene glycol by ultraviolet irradiation. It is still a transparent liquid after polymerization. Assembling the lithium / copper model battery with the polymer dispersion obtained above as the electrolyte, the dissolution and deposition cycle life of metal lithium can reach 300 times, and the average coulombic efficiency is 97.5%;

Embodiment 3

[0039] Add 1 g of lithium bisfluorosulfonimide to 7.5 g of polypropylene carbonate, and stir vigorously to obtain a clear electrolyte. 2.5 g of ethylene oxide and 1 mg of azobisisobutyronitrile were added thereto, and the ethylene oxide was polymerized into polyethylene glycol by ultraviolet irradiation. It is still a transparent liquid after polymerization. Compared with using the polymer dispersion obtained above as the electrolyte to assemble the lithium / copper model battery, the dissolution and deposition cycle life of metal lithium can reach 300 times, and the average coulombic efficiency is 97.9%.

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Abstract

The invention relates to a polymer dispersion liquid and application thereof. The dispersion liquid consists of a solvent, a lithium salt and a polymer, wherein the polymer is dispersed into the solvent in a molecule form, and comprises one or more than two of polydioxolame, polyethylene glycol, polyvinylidene fluoride, polymethylsiloxane and styrene fat olefin copolymer. The preparation method ofthe polymer dispersion liquid is simple, controllable in polymer content and adjustable in polymer type, and large-scale production is realized easily. According to the prepared polymer dispersion liquid, the mechanical stability of the cathode interface film (SEI) of a lithium battery is improved, the crushing and falling of the interface film are prevented effectively through flexibility, and the cycle life of the lithium battery is prolonged greatly.

Description

technical field [0001] The present invention generally relates to polymer dispersions, and more particularly to applications in lithium batteries. technical background [0002] Using metal lithium as the active material of the negative electrode of the lithium-ion battery can increase the energy density of the battery to more than 500Wh / kg, which is 2 to 3 times higher than the current commercial lithium-ion battery, which is very attractive. The potential of metal lithium relative to the standard hydrogen electrode is -3.04V, and it can react with most solvents and lithium salts to form an SEI film. With expansion and contraction, the SEI film on the surface is difficult to maintain stability, resulting in the continuous formation and rupture of the surface SEI film. Since the formation of SEI requires the consumption of electrolyte, it will lead to a rapid degradation of battery performance. If the flexible polymer can be dispersed in the electrolyte, participate in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525H01M10/42
CPCY02E60/10
Inventor 张洪章张华民陈雨晴李先锋曲超杨晓飞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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