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Application of nitrile compound in preparation of electrolyte for high-voltage battery system

A high-voltage battery and compound technology, which is applied in the field of lithium-ion batteries, can solve the problems of looseness and low ion conductivity, and the incompatibility of graphite and lithium metal negative electrodes, so as to improve incompatibility, improve high-voltage stability, and increase reduction potential Effect

Active Publication Date: 2020-09-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfone and nitrile solvents are not compatible with graphite and lithium metal anodes because they are easy to form a loose and low-ionic-conductivity interfacial layer on the anode layer.

Method used

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  • Application of nitrile compound in preparation of electrolyte for high-voltage battery system
  • Application of nitrile compound in preparation of electrolyte for high-voltage battery system
  • Application of nitrile compound in preparation of electrolyte for high-voltage battery system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a glove box with a water content of less than 1ppm and an oxygen content of less than 1ppm, the lithium-ion battery electrolyte is prepared: LiPF 6 Dissolve in a mixed solvent with a mass ratio of EC:EMC of 3:7, stir and mix evenly, so that the system finally dissolves into a colorless and transparent solution, in which LiPF 6 The concentration is 1.0mol / L. Then add 1wt.% nitrile compound 3-trifluoromethyl-1,3,6-hexanetrinitrile (marked as 1% FMHTCN) after the substitution of F functional group in the above electrolytic solution, prepare the electrolytic solution obtained test.

[0029] Wherein the preparation method of 3-trifluoromethyl-1,3,6-hexanetrinitrile is: get 161g of hexanetrinitrile in the three-necked flask after drying, feed nitrogen into the flask system to ensure that the reaction system Anhydrous and oxygen-free conditions, and place the system in an ice-water bath at 0-5°C. Add 300mL of dried tetrahydrofuran to the system as a solvent, stir and mix...

Embodiment 2

[0032] In a glove box with a water content of less than 1PPM and an oxygen content of less than 1PPM, the lithium-ion battery electrolyte is prepared: LiPF 6 Dissolve in a mixed solvent with a mass ratio of EC:EMC of 3:7, stir and mix evenly, so that the system finally dissolves into a colorless and transparent solution, in which LiPF 6 The concentration is 1.0mol / L. Then, 1 wt.% nitrile compound 3-fluoro-1,3,6-hexanetrinitrile (marked as 1% FHTCN) substituted with F functional group was added to the above electrolyte solution, and the obtained electrolyte solution was prepared for testing.

[0033] The preparation method of 3-fluoro-1,3,6-hexanetrinitrile is as follows: take 161g of hexanetrinitrile into a three-necked flask after drying, and feed nitrogen into the flask system to ensure that the reaction system is anhydrous. Anaerobic conditions, and place the system in an ice-water bath at 0-5°C. Add 300mL of dried tetrahydrofuran to the system as a solvent, stir and mix ...

Embodiment 3

[0036] In a glove box with a water content of less than 1PPM and an oxygen content of less than 1PPM, the lithium-ion battery electrolyte is prepared: LiPF 6 Dissolve in a mixed solvent with a mass ratio of EC:EMC of 3:7, stir and mix evenly, so that the system finally dissolves into a colorless and transparent solution, in which LiPF 6The concentration is 1.0mol / L. Then add 1wt.% nitrile compound 3-trifluoromethanesulfonyl-1,3,6-hexanetrinitrile (marked as 1% FSHTCN) after the substitution of F functional group in the above electrolytic solution, prepare the electrolytic solution obtained test.

[0037] Wherein the preparation method of 3-trifluoromethanesulfonyl-1,3,6-hexanetrinitrile is: get 161g of hexanetrinitrile in the three-necked flask after drying, feed nitrogen into the flask system to ensure the reaction Anhydrous and oxygen-free conditions for the system, and place the system in an ice-water bath at 0-5°C. Add 300mL of dried tetrahydrofuran to the system as a s...

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Abstract

The invention discloses an application of a nitrile compound in preparation of an electrolyte for a high-voltage battery system. The structural formula of the nitrile compound is shown in the specification, n1, n2 and n3 are integers from 0 to 10 respectively, but are not 0 at the same time, and Rf is a fluorine-containing functional group. The substitution of the F-containing electron withdrawingfunctional group can cooperate with the nitrile functional group to well modify the positive electrode interface layer, thereby further enhancing the high-voltage stability of the battery, F-containing functional groups are substituted, so that the reduction potential of nitrile molecules can be effectively improved, a stable LiF-rich interface layer is formed on a graphite or lithium metal negative electrode, the incompatibility of a nitrile additive to the negative electrode is further improved, and the overall high-voltage stability of the soft package total battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to the application of nitrile compounds in the preparation of electrolyte solutions for high-voltage battery systems. Background technique [0002] Improving the energy density of batteries, especially the volume energy density is the focus of current research. There are two ways to increase the volumetric energy density. One is to develop cathode materials with high capacity or high working voltage; the other is to optimize the design structure of the battery itself, such as increasing the compression density and the mass ratio of positive and negative electrodes, or reducing the inactive group. quality score. In fact, the compacted density and optimized mass ratio of the active materials, as well as the thickness of the separator and current collector are close to their limit values. In particular, reducing the thickness of separators and current collec...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525C07C253/30C07C255/10C07C255/17C07C315/00C07C317/44
CPCC07C253/30C07C315/00H01M10/0525H01M10/0567H01M2300/0025C07C255/10C07C255/17C07C317/44Y02E60/10
Inventor 杨勇杨雪蕊廖颖张忠如
Owner XIAMEN UNIV
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