Silicon-containing organic compound and application thereof

A technology of organic compounds and compounds, applied in the direction of silicon organic compounds, organic chemistry, organic electrolytes, etc., can solve problems such as unsatisfactory, potential safety hazards, poor heat dissipation, etc., and achieve the effects of reducing flammability, reducing viscosity, and improving high temperature performance

Inactive Publication Date: 2019-04-05
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic solvents in the electrolyte of traditional lithium-ion batteries have low boiling point and flash point, are flammable and volatile, and have poor heat dissipation, which is likely to bring safety hazards; ordinary high-voltage electro...

Method used

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  • Silicon-containing organic compound and application thereof
  • Silicon-containing organic compound and application thereof
  • Silicon-containing organic compound and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0048] Electrolyte preparation steps: In a glove box filled with argon, ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) were mixed according to the weight ratio of 25:5 : 50:20 ratio is mixed, then add the organosilicon solvent shown in the compound (1) based on the total mass of solvent 5wt% to the mixed solvent, and slowly add 12.5wt% lithium hexafluorophosphate, after that, add mass The fraction is 0.5% of vinylene carbonate (VC), 1.5% of 1,3-propane sultone (1,3-PS), 2% of fluoroethylene carbonate (FEC), and the examples are obtained after stirring evenly 1-1 Lithium-ion battery electrolyte.

[0049] Inject the prepared non-aqueous electrolyte for lithium-ion batteries into fully dried 4.7V LiNi 0.5 mn 1.5 o 4 After the / AG soft-pack battery was put on hold at 45°C, formed in a high-temperature fixture, and sealed twice, the battery performance test was carried out to obtain the battery used in Example 1-1.

Embodiment 1-2 to Embodiment 1-14

[0050] Embodiment 1-2 to embodiment 1-14 and comparative example 1 to comparative example 2

[0051] In Example 1-2 to Example 1-14, except that the proportions of the components of the electrolyte are added as shown in the table below, the others are the same as in Example 1-1, see Table 1.

Embodiment 2-1

[0057] Electrolyte preparation steps: In a glove box filled with argon, ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) were mixed according to the weight ratio of 25:5 : 50:20 ratio is mixed, then add the organosilicon carboxylate solvent shown in the compound (8) based on the total mass of solvent 5wt% to the mixed solvent, and slowly add 12.5wt% lithium hexafluorophosphate, after that, add to the electrolyte Add mass fraction of 0.5% vinylene carbonate (VC), 1.5% 1,3-propane sultone (1,3-PS), 2% fluoroethylene carbonate (FEC), stir well Obtain the lithium-ion battery electrolyte of Example 2-1.

[0058] Inject the prepared non-aqueous electrolyte for lithium-ion batteries into fully dried 4.7V LiNi 0.5 mn 1.5 o 4 After the / AG soft-pack battery was put on hold at 45°C, formed in a high-temperature fixture, and sealed twice, the battery performance test was carried out to obtain the battery used in Example 2-1. ...

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Abstract

The invention discloses a silicon-containing organic compound and application thereof. The silicon-containing organosilicon compound mainly comprises organic silicon carbonates, organic silicon carboxylates and ether modified silanes. The silicon-containing organic compound can be applied to lithium ion battery electrolyte, and serves as a solvent for the lithium ion battery electrolyte, the lithium ion battery electrolyte further comprises ethylene carbonate, propylene carbonate, methyl ethyl carbonate and diethyl carbonate which are used as basic solvents as well as lithium hexafluorophosphate, vinylene carbonate, 1,3-propanesulfonate and fluoroethylene carbonate which are taken as additives. The organosilicon compound electrolyte solvent has high oxidative decomposition potential, hightemperature resistance and high voltage resisting stability of a lithium ion battery can be improved quite well, wettability and low viscosity are good, the lithium ion conductivity can be improved quite well, the rate capability and the safety of the battery are improved, and the silicon-containing organic compound is a novel second-generation lithium ion battery solvent.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-containing organic compound and its application. Background technique [0002] Electrolyte, as one of the four main materials of lithium-ion batteries, has strong adaptability. A very important feature is customization. The final formula needs to be determined according to the type of positive electrode material, battery shape, and battery performance of the lithium-ion battery. . The organic solvents in the electrolyte of traditional lithium-ion batteries have low boiling point and flash point, are flammable and volatile, and have poor heat dissipation, which is likely to bring safety hazards; ordinary high-voltage electrolytes can be introduced with high-voltage additives to obtain 4.4-4.7V electrolytes, but still It cannot meet the requirements of the 4.8V or even 5V potential window of power lithium batteries based on a new generation of high-voltage cathode ma...

Claims

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Application Information

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IPC IPC(8): C07F7/18C07F7/08C07F7/04H01M10/0569H01M10/0525
CPCC07F7/04C07F7/1896H01M10/0525H01M10/0569H01M2300/0028Y02E60/10
Inventor 杜建委朱学全郭力
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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