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Electrolyte for polyoxometalate ionic liquid lithium ion battery and preparation method thereof

A polyoxometalate and lithium polyoxometalate technology, which is applied in the field of polyoxometalate ionic liquid lithium-ion battery electrolyte and lithium battery electrolyte, can solve narrow temperature range, safety problems, and low ignition point and other problems, to achieve the effect of wide applicable temperature range, reduced polarization, and high ignition point

Active Publication Date: 2017-05-31
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention provides a novel lithium-ion battery electrolyte that can be stored at high temperature and has a certain flame retardancy. The ionic liquid also has high conductivity, but the electrolyte salt in the electrolyte described in the invention is LiPF6, the salt will produce HF when encountering a trace amount of water. As we all know, HF is the key factor leading to the failure of lithium batteries; in addition to ionic liquid and electrolyte salt, there is also dimethyl carbonate in the electrolyte, Commonly used organic solvents for lithium battery electrolytes such as ethylene carbonate and ethyl methyl carbonate. Compared with ionic liquids, these solvents have a narrower temperature range and a lower ignition point. When the battery thermal runaway occurs, it is easy to burn and cause greater safety hazards. question

Method used

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  • Electrolyte for polyoxometalate ionic liquid lithium ion battery and preparation method thereof
  • Electrolyte for polyoxometalate ionic liquid lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0022] An electrolyte solution for a polyoxometalate ionic liquid lithium ion battery, comprising the following raw material components mixed: ionic liquid and polyoxometalate lithium salt;

[0023] Described ionic liquid comprises imidazolium cation and polyoxometalate anion synthesis, and wherein the structural formula of imidazolium cation is: , abbreviated as [MeMeIm] + (Where R1, R2 are both methyl-CH 3 , methyl is abbreviated as -Me, imidazole main structure is abbreviated as Im); phosphomolybdate anion refers to [PMo 12 o 40 ] 3- , the synthesized ionic liquid is [MeMeIm] 3 [PMo 12 o 40 ]. The electrolyte salt is Lithium polyoxometalate 3 PMo 12 o 40 .

Embodiment 2

[0025] An electrolyte solution for a polyoxometalate ionic liquid lithium ion battery, comprising the following raw material components mixed: ionic liquid and polyoxometalate lithium salt;

[0026] Described ionic liquid comprises imidazolium cation and polyoxometalate anion synthesis, and wherein the structural formula of imidazolium cation is: , abbreviated as [MeEtIm] + (where R1 is methyl-CH 3 , R2 is ethyl-C 2 h 5 , methyl is abbreviated as -Me, ethyl is abbreviated as -Et, and the main structure of imidazole is abbreviated as Im); phosphotungstate anion refers to [PW 12 o 40 ] 3- , the synthesized ionic liquid is [MeEtIm] 3 [PW 12 o 40 ]. The electrolyte salt is Lithium polyoxometalate 3 PW 12 o 40 .

Embodiment 3

[0028] An electrolyte solution for a polyoxometalate ionic liquid lithium ion battery, comprising the following raw material components mixed: ionic liquid and polyoxometalate lithium salt;

[0029] Described ionic liquid comprises imidazolium cation and polyoxometalate anion synthesis, and wherein the structural formula of imidazolium cation is:

[0030] , abbreviated as [MeBuIm] + (where R1 is methyl-CH 3 , R2 is n-butyl-C 4 h 9 , methyl is abbreviated as -Me, n-butyl is abbreviated as -Bu, and the main structure of imidazole is abbreviated as Im); silicotungstate anion refers to [SiW 12 o 40 ] 4- , the synthesized ionic liquid is [MeBuIm] 4 [SiW 12 o 40 ]. The electrolyte salt is Lithium polyoxometalate 4 SiW 12 o 40 .

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Abstract

The invention discloses electrolyte for a polyoxometallate ionic liquid lithium ion battery. The electrolyte comprises the following raw materials: ionic liquid and lithium polyoxometallate, wherein the ionic liquid is synthesized from imidazolium cations and polyoxometallate anions; the structural formula of the imidazolium cations is shown in the specification, wherein each of R1 and R2 is one of alkyl groups with 1-6 carbon atoms; the polyoxometallate anions refer to [XY12O40]<3-> or [XY12O40]<4->, wherein X is any one of two elements P and Si, and Y is any one of two elements Mo and W. Since the lithium polyoxometallate Li3XY12O40 is in a three-dimensional skeleton structure, lithium ions can be conducted in a three-dimensional skeleton, and the polarity caused by the ion transport problem of the battery is reduced; since the lithium polyoxometallate does not contain fluorine, the moisture problem and the safety problem caused by fluorine are avoided.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium battery, in particular to an electrolyte solution for a polyoxometalate ionic liquid lithium ion battery, and belongs to the technical field of ionic liquid electrolytes. Background technique [0002] With the intensification of environmental pollution, the demand for green chemical power sources in various countries is increasing. As a representative of green chemical power sources, lithium batteries have the advantages of high energy density, long service life, and low self-discharge rate, and are widely used in the market. Applications. Lithium batteries are composed of positive electrode materials, diaphragms, negative electrode materials, and electrolytes. Lithium battery electrolytes are the carriers for lithium ion transmission in batteries, and are generally composed of lithium salts and organic solvents. Commonly used lithium salts include: LiPF 6 、LiBF 4 , LiBOB, etc. Organic s...

Claims

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Application Information

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IPC IPC(8): H01M10/0566
CPCH01M10/0567H01M10/058Y02E60/10
Inventor 廖小东王瑨谢皎朱睿
Owner 中国东方电气集团有限公司
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