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A kind of preparation method of electrolyte for improving the safety of lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as environmental pollution, low boiling point of electrolyte, flammability, etc., and achieve good application prospects, economic benefits, and electrochemical performance. Excellent, the effect of solving security problems

Active Publication Date: 2016-07-13
临汾袤源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of electrolyte has a low boiling point, is volatile, flammable, and has low conductivity. These shortcomings lead to problems such as poor high and low temperature performance, short service life, and low safety performance of lithium-ion batteries during use. If used improperly, it may endanger human health. , causing serious pollution to the environment
The many shortcomings of the existing electrolyte have restricted the popularization and application of lithium batteries to a certain extent.

Method used

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  • A kind of preparation method of electrolyte for improving the safety of lithium ion battery
  • A kind of preparation method of electrolyte for improving the safety of lithium ion battery
  • A kind of preparation method of electrolyte for improving the safety of lithium ion battery

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preparation example Construction

[0024] Referring to the accompanying drawings, the present invention is a method for preparing an electrolyte that improves the safety of lithium-ion batteries, comprising:

[0025] Step 1: Take any two or three of the organic solvents and mix them according to the volume ratio of 1:1 or 1:1:1 to form a mixed solvent;

[0026] Step 2: Take 8-9g of mixed solvent, add 1-2g of ionic liquid, add 0.05-0.24g of lithium salt, place in a glove box with water content and oxygen content less than 1ppm for preparation, and prepare a 1M electrolyte.

[0027] The organic solvents include: dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), ethylene carbonate (EC) and propylene carbonate (PC).

[0028] Include in described ionic liquid: cation and anion, the molecular structure of described ionic liquid is:

[0029]

[0030] Wherein, the cationic substituent R is included in the cationic 1 , R 2 , R 3 , R 4 , the cationic substituent R 1 , R 2 , R 3 ,...

Embodiment 1

[0035] Mix ethylene carbonate (EC) and dimethyl carbonate (DMC) at a volume ratio of 1:1 to form a mixed solvent; take 9 g of the mixed solvent, add 1 g of cation as triethylmethylammonium, and anion as carbonate Ionic ionic liquid, add 0.08g of LiPF 6 , prepared in a glove box with water content and oxygen content less than 1ppm, and prepared as a 1M electrolyte.

Embodiment 2

[0037] Mix ethylene carbonate (EC) and dimethyl carbonate (DMC) at a volume ratio of 1:1 to form a mixed solvent; take 8 g of the mixed solvent, add 2 g of the cation as triethylmethylammonium, and the anion as carbonate Ionic ionic liquid, add 0.12g of LiPF 6 , prepared in a glove box with water content and oxygen content less than 1ppm, and prepared as a 1M electrolyte.

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Abstract

The invention discloses a preparation method of an electrolyte for improving safety of a lithium ion battery. The preparation method comprises the following steps: taking any two or three of organic solvents for mixing according to a volume ratio of 1:1 or 1:1:1 and preparing a mixed solvent; adding ionic liquid and lithium salt into the mixed solvent and putting the mixed solvent in a glove box with the content of water being less than 1ppm and the content of oxygen being less than 1ppm to prepare 1M of electrolyte. The electrolyte of the lithium ion battery is convenient to prepare, low in cost, excellent in using performance, reduced in the volatility and improved in heat stability; meanwhile, the prepared electrolyte of the lithium ion battery has the advantages of excellent electrochemical performance and small possibility of combusting, thereby fundamentally solving the problem of the safety of the lithium ion battery; compared with the common imidazolium ionic liquid, the ionic liquid added in the preparation process has the advantages of low cost and convenience in preparation and is applicable to large-scale industrial production and excellent in the application prospects and the economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical battery preparation, in particular to a method for preparing an electrolyte for improving the safety of lithium-ion batteries. Background technique [0002] As human society has higher and higher requirements for low-carbon environmental protection, energy saving and consumption reduction, lithium-ion batteries, as a new type of green energy, have a long cycle life, and the advantages of environmental protection and energy saving are becoming more and more prominent, especially the cost of lithium-ion batteries is constantly increasing. After the reduction and continuous improvement of safety performance, lithium-ion batteries will replace other types of batteries in more fields. [0003] Lithium-ion battery electrolyte is one of the four key materials of lithium batteries, and its performance directly determines the comprehensive performance of lithium batteries such as battery capacity, safety ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569
CPCH01M10/0525H01M10/0569Y02E60/10
Inventor 张利锋张金振刘毅郭守武
Owner 临汾袤源新材料科技有限公司