Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Mixed water-based lithium battery electrolyte solution and preparation method thereof

A technology of electrolyte and lithium battery, which is applied in the field of mixed water lithium battery electrolyte and preparation, can solve the problems of easy water decomposition by floating charge current, high self-discharge rate, and poor cycle performance, so as to avoid the formation of dendrites and reduce the Good self-discharge rate and colloidal toughness

Inactive Publication Date: 2018-09-07
CHENDU NEW KELI CHEM SCI CO LTD
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, lithium batteries using aqueous electrolytes that are widely used have negative electrode zinc dendrites, high self-discharge rate, easy to decompose water when the float current is large, and low water retention, resulting in poor cycle performance.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add the modified nano-silica and solvent of the hydroxyl flexible chain segment into the reaction vessel first, then add carboxymethyl cellulose lithium, heat and magnetically stir for 5 hours, filter and dry to obtain carboxymethyl cellulose lithium Modified nano-silica compounded with a flexible hydroxyl segment; the flexible hydroxyl segment is a straight chain segment with 9 carbon atoms; the solvent is glycerol; the heating temperature is 70°C;

[0030] In the reaction system, by weight parts, wherein: 26 parts of modified nano-silica of hydroxyl flexible chain segment, 53 parts of solvent, 21 parts of carboxymethyl cellulose lithium;

[0031] (2) Add lithium sulfate monohydrate and zinc sulfate heptahydrate into deionized water, stir for 23 hours to dissolve all the salts, continue to add deionized water to adjust to the predetermined concentration, and then adjust the pH value to 4 to prepare a mixed solution; The predetermined concentration of lithium sulfat...

Embodiment 2

[0035] (1) First add the modified nano-silica of the flexible hydroxyl segment and the solvent into the reaction vessel, then add carboxymethyl cellulose lithium, heat and magnetically stir for 4 hours, filter and dry to obtain carboxymethyl cellulose lithium Modified nano-silica compounded with hydroxyl flexible segments; the hydroxyl flexible segment is a straight chain segment with 6 carbon atoms; the solvent is hexanol; the heating temperature is 50°C;

[0036] In the reaction system, by weight parts, wherein: 20 parts of modified nano-silica of hydroxyl flexible chain segment, 62 parts of solvent, 18 parts of carboxymethyl cellulose lithium;

[0037] (2) Add lithium sulfate monohydrate and zinc sulfate heptahydrate into deionized water, stir for 22 hours to dissolve all the salts, continue to add deionized water to adjust to the predetermined concentration, and then adjust the pH value to 3.5 to prepare a mixed solution; The predetermined concentration of lithium sulfate ...

Embodiment 3

[0041] (1) Add the modified nano-silica and solvent of the hydroxyl flexible chain segment into the reaction vessel first, then add carboxymethyl cellulose lithium, heat and magnetically stir for 6 hours, filter and dry to obtain carboxymethyl cellulose lithium Modified nano-silica compounded with a flexible hydroxyl segment; the flexible hydroxyl segment is a straight chain segment with 12 carbon atoms; the solvent is n-butanol; the heating temperature is 100°C;

[0042] In the reaction system, by weight parts, wherein: 30 parts of modified nano-silica of hydroxyl flexible chain segment, 45 parts of solvent, 25 parts of carboxymethyl cellulose lithium;

[0043] (2) Add lithium sulfate monohydrate and zinc sulfate heptahydrate into deionized water, stir for 22~25 hours to dissolve all the salts, continue to add deionized water to adjust to the predetermined concentration, and then adjust the pH value to 3.5~4.5 to prepare Obtain mixed solution; The predetermined concentration ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of lithium batteries, and discloses a mixed water-based lithium battery electrolyte solution and a preparation method thereof. The preparation method includes the following preparation processes: (1) adding hydroxyl flexible segment modified nano-silica, lithium carboxymethyl cellulose and a solvent into a reaction vessel, and carrying out a stirring reaction toprepare lithium carboxymethyl cellulose compounded hydroxyl flexible segment modified nano-silica; (2) adding lithium sulfate hydrate and zinc sulfate heptahydrate into deionized water, stirring and adjusting the pH value to obtain a mixed solution; and (3) adding the lithium carboxymethyl cellulose compounded hydroxyl flexible segment modified nano-silica into the mixed solution, and thus obtaining the mixed water-based lithium battery electrolyte solution. When the prepared mixed water-based electrolyte solution is used in a lithium battery, higher specific capacity, low self-discharge rate,low floating charge current density, high rate performance and better cycling ability are obtained; and a zinc deposited layer on a negative electrode can be more gentle and smooth by using the silicon dioxide-doped electrolyte solution, the formation of dendritic crystals is effectively avoided, and the possibility of battery short circuit is greatly reduced.

Description

technical field [0001] The invention relates to the field of lithium batteries, and discloses a mixed aqueous lithium battery electrolyte and a preparation method. Background technique [0002] Electrolyte is an important part of lithium-ion batteries, and it plays the role of transferring charge between positive and negative electrodes in the battery. It has an important impact on the main performance of the battery such as operating temperature, specific energy, cycle efficiency, and safety. Commonly used electrolytes include aqueous electrolytes and organic electrolytes. In traditional batteries, the electrolyte system uses water as the solvent. Because many substances have good solubility in water, and people have a deep understanding of the physical and chemical properties of the aqueous solution system, the range of battery electrolyte selection very wide. [0003] Since the commercialization of lithium-ion batteries using lithium-ion intercalation compounds (carbon...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002Y02E60/10
Inventor 陈庆赵海林
Owner CHENDU NEW KELI CHEM SCI CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com