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High-voltage electrolyte for lithium ion battery

A lithium-ion battery and high-voltage technology, applied in the field of lithium-ion batteries, can solve the problems of toxicity, poor thermal stability, and low solubility of LiBOB, and achieve the effects of high conductivity, good compatibility, and high charging capacity

Inactive Publication Date: 2015-09-23
ZHANGJIAGANG HUASHENG CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the lithium salts used above all have some disadvantages, such as LiAsF 6 Toxic, LiClO 4 Oxidation is higher, LiBF 4 and LiPF 6 The thermal stability of LiBOB is poor, and the solubility of LiBOB in carbonate solvent is low, etc.

Method used

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  • High-voltage electrolyte for lithium ion battery
  • High-voltage electrolyte for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The battery-grade fluorinated solvent 4-trifluoromethylethylene carbonate (TFPC) and dimethyl carbonate (DMC) were prepared as a mixed solvent in a glove box filled with argon gas at a volume ratio of 1:1, and slowly added under stirring Lithium salt lithium difluorooxalate borate (LiODFB), configure 1.0mol / L LiODFB electrolyte. The conductivity of the electrolyte at -15°C, 25°C and 60°C was tested with a DDSJ-308A conductivity meter, and they were 1.5ms / cm, 5.62ms / cm and 9.72ms / cm, respectively.

[0035]The fluorine-containing high-voltage electrolyte 1.0mol / L LiODFB-TFPC / DMC (volume ratio 1:1) and the conventional electrolyte 1.0mol / L LiPF 6 -EC / DMC (volume ratio 1:1) uses Pt as the working electrode, metal lithium as the counter electrode and reference electrode to test the oxidation potential of the electrolyte, the test voltage range is 3.0-6.5V, and the scan speed is 5mV / s. The oxidation potential of the electrolyte configured in this embodiment is as high as 5...

Embodiment 2

[0037] The battery-grade fluorinated solvent fluorinated ethylene carbonate (FEC) and dimethyl carbonate (DMC) were prepared as a mixed solvent in a glove box filled with argon at a volume ratio of 1:1, and lithium salt difluoride was slowly added under stirring. Lithium oxalate borate (LiODFB), configure 1.0mol / L LiODFB electrolyte.

[0038] The fluorine-containing high-voltage electrolyte configured in this embodiment and the conventional electrolyte 1.0mol / L LiPF 6 -EC / DMC (volume ratio 1:1) uses Pt as the working electrode, metal lithium as the counter electrode and reference electrode to test the oxidation potential of the electrolyte, the test voltage range is 3.0-6.5V, and the scan speed is 5mV / s. The oxidation potential of the electrolyte configured in this embodiment is as high as 5.2V.

Embodiment 3

[0040] The battery-grade fluorinated solvent 4-trifluoromethylethylene carbonate (TFPC), fluoroethylene carbonate (FEC), ethylene carbonate (EC) and dimethyl carbonate (DMC) were mixed in a volume ratio of 1:1:1 : 1 configure a mixed solvent in a glove box full of argon, slowly add lithium salt lithium difluorooxalate borate (LiODFB) under stirring, and configure a 1.0mol / L LiODFB electrolyte.

[0041] The fluorine-containing high-voltage electrolyte configured in this embodiment and the conventional electrolyte 1.0mol / L LiPF 6 -EC / DMC (volume ratio 1:1) uses Pt as the working electrode, metal lithium as the counter electrode and reference electrode to test the oxidation potential of the electrolyte, the test voltage range is 3.0-6.5V, and the scan speed is 5mV / s. The oxidation potential of the electrolyte configured in this embodiment is as high as 5.5V.

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Abstract

The invention discloses a high-voltage electrolyte for a lithium ion battery. The high-voltage electrolyte comprises lithium difluoro(oxalato)borate and an organic solvent, wherein the organic solvent is a mixed solution of a fluorinated solvent and a carbonic ester solvent; the concentration of the lithium difluoro(oxalato)borate in the high-voltage electrolyte for the lithium ion battery is 0.5-2.0mol / L; and the volume percentage of the fluorinated solvent in the organic solvent is 20-90 percent. The high-voltage electrolyte for the lithium ion battery provided by the invention has a high oxidation potential, and very high compatibility with high-voltage cathode materials.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-voltage electrolyte solution for lithium ion batteries. Background technique [0002] With the deepening of the global energy crisis, the depletion of oil resources, and the increasing harm of air pollution and global temperature rise, some western countries, mainly in Europe and the United States, have begun to formulate and gradually implement strict vehicle exhaust emission standards. It is generally recognized that energy conservation and emission reduction are the main directions of future automotive technology development, and they are stepping up the development of clean vehicles with no or low emissions and low fuel consumption. The development of new energy electric vehicles will be the best way to solve this technical difficulty. Low energy consumption , pollution-free green cars began to become a focus of attention. [0003] Lithium-ion batteries have the a...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0568
CPCH01M10/0568H01M10/0569H01M2300/0037Y02E60/10
Inventor 徐旭荣周应华胡亚冬沈鸣张先林杨志勇
Owner ZHANGJIAGANG HUASHENG CHEM CO LTD
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