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Electrolyte and electrochemical device

An electrolyte and electrochemical technology, applied in the field of energy storage materials, can solve the problems of cycle performance and storage performance to be improved, achieve excellent high temperature and high pressure cycle performance and storage performance, inhibit oxidation, and passivate the effect of surface activity

Active Publication Date: 2021-01-12
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the above-mentioned electrolyte system. For example, under high voltage and high temperature conditions, the cycle performance and storage performance of the above-mentioned electrolyte system need to be improved.

Method used

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  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0138] (1) Preparation of the compound of general formula I-1:

[0139] Its reaction equation is:

[0140]

[0141] The specific preparation process is:

[0142] 1. Add the P-2 aqueous solution with a concentration of 30-40% to the raw material P-1 dropwise within 20-60 minutes and stir rapidly. After the dropwise addition, stir rapidly for 15-30 hours, and stir in an oil bath at 70-90°C for 3-5 hours under reflux. A colorless fuming viscous liquid intermediate product I-1-1 was obtained;

[0143] 2. Continue to join K 2 CO 3 , KI, anhydrous acetonitrile; stir quickly to form a solid-liquid mixed phase, quickly add raw material P-3 at 40-60°C, continue stirring for 10-20h, then cool to room temperature, separate and purify to obtain the compound shown in formula I-1.

[0144] (two) preparation of general formula I-2 compound:

[0145] Its reaction equation is:

[0146]

[0147] The specific preparation process is:

[0148] Anhydrous sodium carbonate, raw material ...

Synthetic example 1

[0155]

[0156] 1. Add 37% formaldehyde aqueous solution dropwise to 1,3-propylenediamine within 0.5h and stir rapidly. After the dropwise addition, stir rapidly for 20h, then reflux and stir in an oil bath at 80°C for 4h to obtain a colorless fuming viscous liquid intermediate product Hexahydropyrimidine;

[0157] 2. Continue to join K 2 CO 3 , KI, anhydrous acetonitrile; stir quickly to form a solid-liquid mixed phase, add β-chloropropionitrile within 0.5h at 60°C, continue stirring for 17h, cool to room temperature, separate and purify to obtain the compound of formula A2.

[0158] Carbon NMR spectrum such as figure 1 shown.

Synthetic example 2

[0160]

[0161] Anhydrous sodium carbonate, piperazine and β-chloropropionitrile were mixed in absolute ethanol, and the reaction was stirred for 4h. The crude product was obtained by washing with hot ethanol several times, and recrystallized to obtain the compound of formula A8.

[0162] Carbon NMR spectrum such as figure 2 shown.

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Abstract

The present application relates to the field of energy storage materials, in particular, to an electrolyte and an electrochemical device. The electrolytic solution of the present application contains additive A and additive B, and additive A is selected from at least one of the polynitrile-based six-membered nitrogen heterocyclic compounds shown in formula I-1, formula I-2 or formula I-3, the additive B is at least one selected from sulfonate compounds. The electrochemical device of the present application contains the above electrolytic solution. The electrolyte of the present application can effectively passivate the surface activity of the positive electrode material, inhibit its oxidation to the electrolyte, effectively reduce the gas production of the battery, and at the same time be adsorbed on the catalytic active points on the graphite surface to form a more stable SEI film, thereby significantly Reduce the occurrence of side reactions. The electrochemical device using the electrolyte of the present application has excellent high-temperature and high-pressure cycle performance and storage performance.

Description

technical field [0001] The present application relates to the field of energy storage materials, in particular, to an electrolyte and an electrochemical device. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. The current demand for lithium-ion batteries is: high voltage, high power, long cycle life, long storage life and excellent safety performance. [0003] Lithium-ion batteries are currently widely used in an electrolyte system using lithium hexafluorophosphate as a conductive lithium salt and cyclic carbonate and / or chain carbonate as a solvent. However, there are still many deficiencies in the above-mentioned electrolyte system, for example, under the condition of high voltage and high temperature, the cycle performance and storage performance of the above-mentioned electrolyte system ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025H01M6/168H01G11/64H01G11/06Y02E60/10H01M10/42
Inventor 徐子俊胡春华伊天成湛英杰梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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