Scandium ion coordination polymer lithium ion battery electrolyte and preparation method thereof

A technology of coordination polymers and lithium-ion batteries, which is applied in the manufacture of electrolyte batteries, electrolytes, solid electrolytes, etc., can solve the problems of poor dimensional thermal stability and low room temperature ion conductivity, and improve stability and cycle performance. Good capacitance and the effect of improving ionic conductivity at room temperature

Inactive Publication Date: 2020-11-24
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of scandium ion coordination polymer lithium ion battery electrolyte preparation method, for solving the room temperature ionic conductivity of PEO polymer electrolyte i

Method used

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  • Scandium ion coordination polymer lithium ion battery electrolyte and preparation method thereof
  • Scandium ion coordination polymer lithium ion battery electrolyte and preparation method thereof
  • Scandium ion coordination polymer lithium ion battery electrolyte and preparation method thereof

Examples

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Effect test

Embodiment 1

[0051] A Sc 3+ The preparation method of coordination polymer lithium ion battery electrolyte comprises the steps:

[0052] S1. Raw material pretreatment:

[0053] S11. Preparation of organic composite solution: Add polyethylene oxide and 3,4-difluorobenzoic acid into 200ml acetone and stir to disperse, stir and disperse at a constant speed of 100r / min for 60min, maintain constant stirring and use 1mol / L sodium bicarbonate solution Adjust the pH of the mixed solution to 6.0 to obtain an organic compound solution;

[0054] S12. Preparation of scandium salt coordination solution: Add scandium salt (scandium acetate) and 2,2-bipyridine into 50ml of ethanol aqueous solution (mass fraction of ethanol is 60%) and keep it at room temperature at a constant speed of 100r / min Stir for 40min to obtain scandium salt coordination solution;

[0055] S2, preparing Sc 3+ Coordination polymer: Add the scandium salt coordination solution into the organic compound solution and stir and dispe...

Embodiment 2

[0061] A Sc 3+ The preparation method of coordination polymer lithium ion battery electrolyte comprises the steps:

[0062] S1. Raw material pretreatment:

[0063] S11. Preparation of organic composite liquid: Add polyethylene oxide and 3,4-difluorobenzoic acid into 200ml acetone and stir to disperse, stir and disperse at a constant speed of 150r / min for 30min, maintain constant stirring and use 1mol / L sodium bicarbonate solution Adjust the pH of the mixed solution to 6.2 to obtain an organic compound solution;

[0064] S12. Preparation of scandium salt coordination solution: add scandium salt (scandium nitrate) and 2,2-bipyridine into 50ml ethanol aqueous solution (mass fraction of ethanol is 65%) and uniformly speed at 150r / min in room temperature atmosphere Stir for 20min to obtain scandium salt coordination solution;

[0065] S2, preparing Sc 3+ Coordination polymer: Add the scandium salt coordination solution into the organic compound solution and stir and disperse at...

Embodiment 3

[0071] A Sc 3+ The preparation method of coordination polymer lithium ion battery electrolyte comprises the steps:

[0072] S1. Raw material pretreatment:

[0073] S11. Preparation of organic composite liquid: Add polyethylene oxide and 3,4-difluorobenzoic acid into 200ml acetone and stir to disperse, stir and disperse at a constant speed of 120r / min for 45min, maintain constant stirring and use 2mol / L sodium bicarbonate solution Adjust the pH of the mixed solution to 6.1 to obtain an organic compound solution;

[0074] S12. Preparation of scandium salt coordination solution: Add scandium salt (scandium chloride) and 2,2-bipyridine into 40ml of ethanol aqueous solution (the mass fraction of ethanol is 62%) and in room temperature atmosphere at a rate of 120r / min Stir at a constant speed for 30 minutes to obtain a scandium salt coordination solution;

[0075] S2, preparing Sc 3+ Coordination polymer: Add the scandium salt coordination solution into the organic compound solu...

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Abstract

The invention relates to the technical field of lithium battery electrolytes, in particular to a preparation method of a scandium ion coordination polymer lithium ion battery electrolyte. The method comprises the following steps: adding polyoxyethylene and 3, 4-difluorobenzoic acid into a solvent, thereby obtaining an organic composite solution; adding scandium salt and 2, 2-dipyridyl into a solvent to obtain a scandium salt coordination solution; and adding the scandium salt coordination solution into the organic composite solution, adding lithium salt and polyvinylpyrrolidone, stirring and dispersing to obtain a coordination polymer sol electrolyte, and drying to obtain the lithium ion battery electrolyte. According to the invention, the problems of low room-temperature ionic conductivity and poor dimensional thermal stability of the PEO polymer electrolyte in the prior art are solved. As the Sc < 3 + > coordination polymer is generated in a polyoxyethylene system, the crystallinityof the polyoxyethylene is reduced, the local relaxation movement of a chain segment is increased, the rapid migration of lithium ions is further improved, the room-temperature ionic conductivity of apolymer electrolyte system is improved, and the stability and the cycle performance of the polymer solid electrolyte are improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrolytes, in particular to a scandium ion coordination polymer lithium ion battery electrolyte and a preparation method. Background technique [0002] Lithium-ion battery: It is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li + intercalation and deintercalation back and forth between the two electrodes; when charging, the Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Lithium-ion batteries have high energy density and high average output voltage. Small self-discharge, good battery, less than 2% per month (recoverable). There is no memory effect. The wide working temperature...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525H01M10/42C08G83/00
CPCC08G83/008H01M10/0525H01M10/0565H01M10/058H01M10/4235H01M2300/0082H01M2300/0091Y02E60/10Y02P70/50
Inventor 陈庆李国松司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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