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

Composite solid electrolyte and preparation method thereof

A solid electrolyte and electrolyte technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of low battery capacity, electrolyte depletion, interface impedance increase, etc., to improve ion transmission and performance The effect of electron conductivity

Active Publication Date: 2020-10-16
安徽迅启新能源科技有限公司
View PDF13 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, lithium-ion secondary batteries have received widespread attention as a recyclable clean energy source. Traditional lithium-ion batteries use carbonate-based organic liquid electrolytes, even at lower current densities than diffusion, and metal Electrochemical performance and safety are limited by the chemical stability of the liquid electrolyte in contact with the negative electrode, where continuous reactions of the liquid electrolyte lead to depletion of the electrolyte and increased interfacial impedance, in addition, indirect processes generated by current-induced internal short circuits may also lead to battery failure That is to say, the traditional lithium-ion battery has the disadvantages of poor stability, easy corrosion, flammability and explosion, and with the frequent occurrence of lithium-ion battery safety accidents, the safety of lithium-ion batteries has been paid more and more attention by people
[0003] In response to the problems caused by the use of organic liquid electrolytes in traditional lithium-ion batteries, researchers have proposed many solutions, such as the use of flame retardant additives, gel electrolytes and polymer solid electrolytes, which can improve the safety of lithium batteries to a certain extent However, this problem cannot be completely solved, and the use of inorganic solid electrolytes instead of organic electrolytes is expected to completely solve the two key problems of traditional lithium-ion batteries: low capacity and short service life. Therefore, all-solid-state lithium batteries with solid electrolytes replacing traditional liquid organic electrolytes are attracting more and more attention

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

preparation example Construction

[0031] The invention provides a preparation method of a composite solid electrolyte, the method comprising the use of polyether diol, 2,6-toluene diisocyanate, catalyst and chain extender mixed reaction to obtain a polyurethane prepolymer; in an inert gas atmosphere Specifically, for example, under an argon atmosphere, disperse lithium salt and inorganic solid electrolyte into 1,3-dioxolane, then add a certain amount of initiator and plasticizer, and obtain a precursor after uniform dispersion Solution: adding the precursor solution to the polyurethane prepolymer, stirring and mixing evenly, standing still, raising the temperature to 70-75° C., and keeping the temperature for 6-8 hours to obtain the composite solid electrolyte.

[0032] In the technical scheme provided by the present invention, polyether diol is first mixed with 2,6-toluene diisocyanate, and after adding a catalyst and a chain extender, gradually add polymerization to synthesize a polyurethane prepolymer; Add ...

Embodiment 1

[0046] A method for preparing a composite solid electrolyte, comprising the following steps:

[0047] (1) Add polyoxypropylene diol (purchased from Dow Chemical) to the reaction vessel, heat up to 110°C, evacuate to 30Pa and keep for 2 hours, then cool down to 58°C, add 2,6-toluene diisocyanate, After the addition, the temperature was raised to 85°C, and the catalyst dibutyltin dilaurate was added to react for 3 hours, then the temperature was lowered to 75°C, and the chain extender 2,2-dimethylolpropionic acid was added to react for 3 hours, and gradually added and polymerized to obtain the The polyurethane prepolymer described above;

[0048] The molar ratio of the polyether diol to 2,6-toluene diisocyanate is 1:2.8;

[0049] The addition of the catalyst is 4% of the total weight of the polyurethane prepolymer;

[0050] The addition of the chain extender is 0.12% of the total weight of the polyurethane prepolymer;

[0051] (2) Under an argon atmosphere, lithium salt bis(t...

Embodiment 2

[0058] A method for preparing a composite solid electrolyte, comprising the following steps:

[0059] (1) Add polyoxypropylene diol (purchased from Dow Chemical) to the reaction vessel, heat up to 110°C, evacuate to 30Pa and keep for 2 hours, then cool down to 58°C, add 2,6-toluene diisocyanate, After the addition, the temperature was raised to 85°C, the catalyst dibutyltin dilaurate was added to react for 2 hours, then the temperature was lowered to 80°C, and the chain extender 2,2-dimethylolpropionic acid was added to react for 2 hours, and gradually added and polymerized to obtain the The polyurethane prepolymer described above;

[0060] The molar ratio of the polyether diol to 2,6-toluene diisocyanate is 1:2.5;

[0061] The addition of the catalyst is 3% of the total weight of the polyurethane prepolymer;

[0062] The added amount of the chain extender is 0.01% of the total weight of the polyurethane prepolymer;

[0063] (2) Under an argon atmosphere, lithium salt bis(t...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of solid electrolytes, and particularly relates to a composite solid electrolyte and a preparation method thereof. The method comprises the steps: enablingpolyether glycol, 2, 6-toluene diisocyanate, a catalyst and a chain extender to be mixed and react to obtain a polyurethane prepolymer; in an inert gas atmosphere, dispersing a lithium salt and an inorganic solid electrolyte into 1, 3-dioxolane, adding an initiator and a plasticizer, and performing uniform dispersing to obtain a precursor solution; and adding the precursor solution into the polyurethane prepolymer, performing stirring and mixing uniformly, performing standing, performing heating to 70-75 DEG C, and keeping the temperature for 6-8 hours to obtain the composite solid electrolyte. According to the invention, the 1, 3-dioxolane takes the lithium salt additive as a ring-opening initiator, the coating of the inorganic solid electrolyte is performed in the ring-opening polymerization process, and a mutually doped networked polymer with a polyurethane system is formed, so the formed networked porous structure has a rich ion transport network, and the ion transport property and the electron conductivity are improved.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, and in particular relates to a composite solid electrolyte and a preparation method thereof. Background technique [0002] In recent years, lithium-ion secondary batteries have received widespread attention as a recyclable clean energy source. Traditional lithium-ion batteries use carbonate-based organic liquid electrolytes, even at lower current densities than diffusion, and metal Electrochemical performance and safety are limited by the chemical stability of the liquid electrolyte in contact with the negative electrode, where continuous reactions of the liquid electrolyte lead to depletion of the electrolyte and increased interfacial impedance, in addition, indirect processes generated by current-induced internal short circuits may also lead to battery failure ; That is, the traditional lithium-ion battery has the disadvantages of poor stability, easy corrosion, flammability and expl...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525C08G18/12C08G18/66C08G18/48C08G18/34
CPCH01M10/0562H01M10/0565H01M10/0525C08G18/12C08G18/6692C08G18/4825C08G18/348H01M2300/0085Y02E60/10
Inventor 徐球白国梁王春花储宁平储昭虎
Owner 安徽迅启新能源科技有限公司
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