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High-salinity non-aqueous electrolyte and use thereof

A non-aqueous electrolyte, high salt concentration technology, applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of severe volatilization, poor thermal stability, battery short circuit, etc., and achieve improved battery safety performance, high thermal stability, inhibition dendrite effect

Inactive Publication Date: 2013-07-24
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to less dissolved lithium salts, most of the organic solvents are in a free solvent state, which is highly volatile and has poor thermal stability.
[0008] 2. Poor security
[0013] At present, battery systems that use metal lithium (sodium) as the negative electrode generally have safety performance problems. The main reason is that dendritic lithium (sodium) dendrites will be generated on the surface of lithium (sodium) sheets during charging and discharging, which will lead to internal short circuits in the battery. , prone to safety accidents

Method used

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  • High-salinity non-aqueous electrolyte and use thereof
  • High-salinity non-aqueous electrolyte and use thereof
  • High-salinity non-aqueous electrolyte and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] High lithium salt concentration electrolyte system and low lithium salt concentration system are used in the comparison experiment of lithium sulfur battery system:

[0042] High lithium salt concentration electrolyte system:

[0043] The electrolytic solution adopts an organic solvent DOL:DME=1:1, the electrolyte is 6mol / L LiTFSI, and the water content of the obtained electrolytic solution is lower than 10ppm.

[0044] Low lithium salt concentration electrolyte system:

[0045] The electrolytic solution adopts an organic solvent DOL:DME=1:1, the electrolyte is 2mol / L LiTFSI, and the water content of the obtained electrolytic solution is lower than 10ppm.

[0046] The lithium-sulfur battery system simulates the battery, and the specific process is as follows:

[0047] Positive electrode material and its pole piece production process:

[0048] The preparation process of the carbon-sulfur composite material is as follows: the porous carbon and the sulfur powder are mix...

Embodiment 2

[0056] High lithium salt concentration electrolyte system and low lithium salt concentration system are used in the comparison experiment of lithium iron sulfide battery system:

[0057] High lithium salt concentration electrolyte system:

[0058] The electrolytic solution adopts an organic solvent DOL:DME=1:1, the electrolyte is 6mol / L LiTFSI, and the water content of the obtained electrolytic solution is lower than 10ppm.

[0059] Low lithium salt concentration electrolyte system:

[0060] The electrolytic solution adopts an organic solvent DOL:DME=1:1, the electrolyte is 1mol / L LiTFSI, and the water content of the obtained electrolytic solution is lower than 10ppm.

[0061] The lithium iron sulfide battery system simulates the battery, and the specific process is as follows:

[0062] Positive electrode material and its pole piece production process:

[0063] Weigh a certain amount of iron sulfide, acetylene black and polyvinylidene fluoride (PVDF) respectively according ...

Embodiment 3

[0067] The high lithium salt concentration electrolyte system is used in the lithium titanate negative electrode system:

[0068] High lithium salt concentration electrolyte system:

[0069] The electrolyte uses organic solvent DEGDME, the electrolyte is 5mol / L LiTFSI, and the water content of the obtained electrolyte is lower than 10ppm.

[0070] Lithium titanate negative electrode battery system simulation battery, the specific process is as follows:

[0071] Positive electrode material and its pole piece production process:

[0072] A certain amount of lithium titanate, acetylene black and polyvinylidene fluoride (PVDF) were respectively weighed according to the weight percentage of 8:1:1, using pyrrolidone as a dispersant, and stirred and mixed evenly. Using aluminum foil as a current collector, the mixed slurry is evenly coated on the current collector, then dried and cut into pole pieces with the same shape and area. The negative pole piece is made of lithium metal. ...

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Abstract

The invention discloses a high-salinity non-aqueous electrolyte. The high-salinity non-aqueous electrolyte comprises a lithium salt and a non-aqueous organic solvent, and the concentration of the lithium salt is 2-10mol / L. The invention also discloses a use of the high-salinity non-aqueous electrolyte in a lithium or sodium cell system. The high-salinity non-aqueous electrolyte has the advantages of high thermal stability, low volatility, high safety, electrochemical widow and aluminum foil corrosivity, and lithium or sodium dendrite overcoming.

Description

technical field [0001] The invention belongs to the field of battery technology. In particular, it relates to a nonaqueous electrolyte for lithium (sodium) secondary batteries. Background technique [0002] As we step into the 21st century, human society is developing at an unprecedented speed. While enjoying the benefits of advanced civilization, human beings have to face energy and environmental crises such as the depletion of fossil fuel resources and the increasingly obvious global greenhouse effect. , which also forces mankind to completely change the energy consumption pattern and vigorously develop renewable and clean energy. [0003] Since Japan's Sony Corporation successfully developed lithium-ion batteries in 1990, lithium-ion batteries have been widely used in mobile phones and cameras due to their excellent performance such as high working voltage (3.6V), high energy density, no memory effect, small self-discharge and long cycle life. , notebook computers and o...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0569H01M10/0525
CPCY02E60/10
Inventor 胡勇胜索鎏敏王跃生李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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