Solid-state lithium battery polymer electrolyte and preparation method and application thereof

A technology of solid electrolytes and polymers, applied in solid electrolytes, lithium batteries, non-aqueous electrolytes, etc., can solve the problems of low room temperature ionic conductivity, low room temperature ionic conductivity, and difficulty in forming SEI films, etc., and achieve high ionic conductivity high efficiency, simple preparation process, and the effect of improving ionic conductivity at room temperature

Active Publication Date: 2017-08-18
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] PEO solid electrolytes have the disadvantage of being easy to crystallize, resulting in low room temperature ionic conductivity; lithium salts commonly used in solid electrolytes have their own disadvantages, such as LiPF 6 Easy to decompose, LiClO 4 Low security, LiSO 3 CF 3 Corrosion collector, etc.
LiBF 4 It has attracted much attention due to its good low-temperature performance and not easy to hydrolyze. However, its room temperature ionic conductivity is not high, and it is difficult to form an SEI film.

Method used

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  • Solid-state lithium battery polymer electrolyte and preparation method and application thereof
  • Solid-state lithium battery polymer electrolyte and preparation method and application thereof
  • Solid-state lithium battery polymer electrolyte and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Li-ion polymer electrolyte

[0051] Polyethylene carbonate is obtained by ring-opening polymerization of carbon dioxide and propylene oxide, wherein the substance ratio of carbonate repeating unit to ethylene repeating unit is 1:1;

[0052] In the glove box, add 0.103g of trifluoroethanol to 2ml of ethylene glycol dimethyl ether solvent, add a magnet and stir to make the dispersion uniform, then add 0.24g of anhydrous lithium hydroxide to the above solution, stir to make the reaction complete, and then Add 0.142g of boron trifluoride ether solution to the above solution, volatilize the solvent under Ar gas condition, and vacuum dry at 60°C to remove the remaining solvent to obtain a dry white solid, and obtain the formula 1 where R is CF 3 CH 2 - Lithium trifluoroethoxytrifluoroborate.

[0053] Dissolve 1.0g of polyethylene carbonate and 0.2g of trifluoroethoxylithium trifluoroborate in 15ml of acetonitrile, stir at room temperature until it is in a homogeneous solution...

Embodiment 2

[0063] Li-ion polymer electrolyte

[0064] Polypropylene carbonate is obtained by ring-opening polymerization of carbon dioxide and propylene oxide, wherein the substance ratio of carbonate repeating unit to propylene repeating unit is 1:1;

[0065] In the glove box, 0.236g of perfluoro-tert-butanol was added to 2ml of ethylene glycol dimethyl ether solvent, and a magnet was added to stir to disperse evenly, and then 0.0625ml of butyllithium (1.6M in hexane) was added to the above solution, Stir to make the reaction complete, then add 0.142 g of boron trifluoride ether solution to the above solution, evaporate the solvent under Ar gas, and dry in vacuo at 60°C to remove the remaining solvent to obtain a dry white solid. where R is (CF 3 ) 3 C-perfluorotert-butoxytrifluoroborate lithium salt.

[0066] Dissolve 1.3g of polypropylene carbonate and 0.4g of perfluorotert-butoxy lithium trifluoroborate in 15g of N,N-dimethylformamide, stir at room temperature until it is in a hom...

Embodiment 3

[0076] Li-ion polymer electrolyte

[0077] Polybutylene carbonate is obtained by ring-opening polymerization of carbon dioxide and 1,2-butylene oxide, wherein the ratio of carbonate repeating unit to butylene repeating unit is 1:1;

[0078] Dissolve 2g of polybutylene carbonate and 0.6g of perfluorotert-butoxylithium trifluoroborate in 20ml of tetrahydrofuran, stir at room temperature until it is in a homogeneous solution state, take 3g of the above solution on polyethylene terephthalate nonwoven Coated on a cloth (5cm*5cm), and dried the obtained polymer electrolyte in a vacuum oven at 70°C overnight. Cut to size.

[0079] Test the ionic conductivity of the lithium ion polymer electrolyte obtained above (perfluorotert-butoxy trifluoroborate lithium / polypropylene carbonate electrolyte): the polymer electrolyte is sandwiched between two pieces of stainless steel and placed in a 2032 battery in the shell. Ionic conductivity is measured by electrochemical AC impedance spectros...

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Abstract

The invention relates to a lithium ion battery electrolyte, specifically to a solid-state lithium battery polymer electrolyte and a preparation method and an application thereof. The electrolyte comprises fluoroalkoxy lithium trifluoroborate, a polycarbonate type polymer and a porous supporting material; and the electrolyte is 20-100[mu]m in thickness, 1*10<-7>-9*10<-3>S/cm in ionic conductivity, minus 10 DEG C to 150 DEG C in working temperature, and greater than 5.0V(vs.Li<+>/Li) in electrochemical window. The invention also discloses a preparation method of the solid-state lithium battery polymer electrolyte. A lithium salt and a carbonate ester type polymer are dissolved into a solvent based on a certain proportion, then a membrane is made on the porous supporting material, and next, vacuum drying is performed to obtain the solid-state lithium battery polymer electrolyte. Compared with the conventional polymer electrolyte, the solid-state lithium battery polymer electrolyte has the advantages of high ionic conductivity, broad electrochemical window, high temperature working range and the like.

Description

technical field [0001] The invention relates to an ion battery electrolyte, in particular to a polymer electrolyte based on fluoroalkoxy trifluoroborate lithium salt and its preparation and application. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, high power density, and long battery life. The current mainstream electrolytes are obtained by dissolving lithium salts in carbonate solvents. Liquid electrolytes have disadvantages such as flammability and explosion, so solid electrolytes have attracted more and more attention. The current CN106450443A discloses a method for PEO-based polymer electrolytes, dispersing PEO, nano-oxides, and lithium salts in acetonitrile, pouring the mixed solution into a polytetrafluoroethylene mold, drying naturally, and finally preparing a micron The polymer electrolyte film of level thickness has improved the conductance of polymer electrolyte; CN106410270A discloses a kind of lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 崔光磊崔子立乔立鑫于莎崔艳艳刘志宏
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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