Preparation method of lithium battery electrolyte

A preparation method and electrolyte technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, primary batteries, etc., can solve the problems of stabilizing viscosity and reducing the internal resistance of lithium batteries, and achieve low viscosity, low internal resistance, and convenient operation Effect

Inactive Publication Date: 2014-07-23
BEIJING INST OF CHEM REAGENTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of lithium battery electrolyte, which can prepare electrolyte with stable viscosity and reduce internal resistance of lithium battery, thereby solving the problem that the electrolyte prepared by existing methods cannot stabilize viscosity and reduce internal resistance of lithium battery. balance problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The present embodiment provides a method for stabilizing the viscosity of the lithium iodide non-aqueous electrolyte and reducing the internal resistance of the lithium-ferrous disulfide battery, comprising the following steps:

[0024] Prepare dioxane, ethylene glycol dimethyl ether and propylene carbonate organic solvents in an environment with a dew point lower than -40°C and an oxygen content of less than 2ppm, with a volume ratio of 1:1:1; when the water content drops to 10ppm Add 0.2% tri-n-butylamine; seal and freeze to 0°C, add lithium iodide while stirring, control the temperature between 0°C and 10°C, prepare the solution with a concentration of 1mol / L, and obtain lithium iodide organic electrolytic Liquid, the electrolyte can be used as the electrolyte of lithium batteries. The experimental data are as follows:

[0025] Electrolyte Storage Experiment

[0026] Viscosity before storage

Viscosity after storage for 30 days

Viscosity after stora...

Embodiment 2

[0030] The present embodiment provides a method for stabilizing the viscosity of the lithium iodide non-aqueous electrolyte and reducing the internal resistance of the lithium-ferrous disulfide battery, comprising the following steps:

[0031] Prepare the organic solvents of dioxane, ethylene glycol dimethyl ether and diglyme glycol dimethyl ether in an environment with a dew point lower than -40°C and an oxygen content of less than 2ppm, with a volume ratio of 1:1:1; When the moisture drops to 10ppm, add 0.1% CaO; seal and freeze to 0°C, add lithium iodide while stirring, control the temperature between 0°C and 10°C, and prepare a solution with a concentration of 1mol / L to obtain lithium iodide An organic electrolyte, which can be used as an electrolyte for a lithium battery. The experimental data are as follows:

[0032] Electrolyte Storage Experiment

[0033] Viscosity before storage

Viscosity after storage for 30 days

Viscosity after storage for 60 days ...

Embodiment 3

[0037] The present embodiment provides a method for stabilizing the viscosity of the lithium iodide non-aqueous electrolyte and reducing the internal resistance of the lithium-ferrous disulfide battery, comprising the following steps:

[0038] Prepare dioxane, ethylene glycol dimethyl ether and propylene carbonate organic solvents in an environment with a dew point lower than -40°C and an oxygen content of less than 2ppm, with a volume ratio of 1:1:1; when the water content drops to 10ppm Add 0.5% triethylamine; seal and freeze to 0°C, add lithium iodide while stirring, control the temperature between 0°C and 10°C, prepare the solution with a concentration of 1mol / L, and obtain lithium iodide organic electrolyte , the electrolyte can be used as the electrolyte of lithium batteries. The experimental data are as follows: Electrolyte storage experiment

[0039] Viscosity before storage

Viscosity after storage for 30 days

Viscosity after storage for 60 days

...

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PUM

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Abstract

The invention discloses a preparation method of a lithium battery electrolyte, belonging to the technical field of lithium batteries. The preparation method is characterized by comprising the steps of adding an organic amine or metal oxide additive which accounts for 0.1-5 percent by weight of an organic solvent in the organic solvent forming an electrolyte; and reducing the temperature of the organic solvent to be 0 DEG C, then adding lithium salt in the organic solvent of the electrolyte under the stirring state, and controlling the temperature of the organic solvent to be 0-10 DEG C in an adding process. According to the preparation method, a defined amount of organic amine or metal oxide is added in a nonaqueous electrolyte, and has alkalinity and a certain inhibition effect; the temperature when lithium salt is added is strictly controlled, the electrolyte is effectively prevented from a polymerization reaction during production and transportation and after injection of a battery, and effects of stabilizing the viscosity of the lithium iodide nonaqueous electrolyte and reducing the internal resistance of a lithium-ferrous disulfide battery are realized.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing electrolyte solution of lithium batteries. Background technique [0002] The electrolyte is an important part of the lithium battery. It is an ionic conductor that conducts the conduction between the positive and negative electrodes of the battery. Its own performance and the interface conditions formed with the positive and negative electrodes greatly affect the performance of the battery. An excellent non-aqueous electrolyte for lithium batteries should meet the following requirements: (1) Good chemical stability, no chemical reaction with positive and negative active materials and current collectors (generally aluminum foil and copper foil) in the battery; (2) ) wide electrochemical stability window; (3) high ionic conductivity and low electronic conductivity; (4) appropriate temperature range, namely high boiling point and low melting point; (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058
CPCH01M6/162H01M6/168H01M2300/0025Y02P70/50
Inventor 王磊孟蓉付呈琳强京林
Owner BEIJING INST OF CHEM REAGENTS
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