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Electrolyte matrix as well as preparation method and application thereof

A technology of electrolyte and solid electrolyte, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as unsatisfactory ion conductivity, limited room for increase in ion conductivity, and difficulty in application

Active Publication Date: 2021-04-20
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the overall ionic conductivity can be improved to a certain extent by compounding with other inorganic fillers, due to the unsatisfactory ionic conductivity of the pure polymer matrix itself, the overall ionic conductivity of the composite solid electrolyte has extremely limited room for improvement. up to 10 -5 S / cm, it is still difficult to realize the application at room temperature

Method used

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  • Electrolyte matrix as well as preparation method and application thereof
  • Electrolyte matrix as well as preparation method and application thereof
  • Electrolyte matrix as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0068] This embodiment provides an electrolyte matrix, wherein the molecular formula of the PEO-PPO-PEO ternary block copolymer is n is 90, m is 8, k is 2; the weight average molecular weight is 25w.

[0069] This embodiment provides a method for preparing a composite solid electrolyte, and the preparation method specifically includes the following steps:

[0070] (I) Add dibenzo-18-crown-6, isopropanol and potassium hydroxide to the reactor, carry out vacuum dehydration 5 times, pass nitrogen gas into the reactor to dilute the gas three times after dehydration, and weigh propylene oxide according to the amount of polymerization Monomer and ethylene oxide monomer, add propylene oxide monomer to conduct primary polymerization at 95°C, add ethylene oxide monomer after the primary polymerization, perform secondary polymerization at 120°C, and use vacuum pumping method after polymerization Remove unreacted ethylene oxide monomer and fill with nitrogen, add adsorbent activated al...

Embodiment 2

[0075]This embodiment provides an electrolyte matrix, wherein the molecular formula of the PEO-PPO-PEO ternary block copolymer is n is 91, m is 7, k is 1; the weight average molecular weight is 10w.

[0076] This embodiment provides a method for preparing a composite solid electrolyte, and the preparation method specifically includes the following steps:

[0077] (I) Add dibenzo-18-crown-6 crown ether, isopropanol and potassium hydroxide to the reactor, carry out vacuum dehydration for 5 times, pass through nitrogen gas to dilute the gas in the reactor three times after dehydration, weigh the ring according to the amount of polymerization Propylene oxide monomer and ethylene oxide monomer, add propylene oxide monomer to conduct primary polymerization at 90°C, add ethylene oxide monomer after the primary polymerization, and perform secondary polymerization at 125°C, after polymerization, use pumping Remove the unreacted ethylene oxide monomer by vacuum and fill it with nitrog...

Embodiment 3

[0082] This embodiment provides an electrolyte matrix, wherein the molecular formula of the PEO-PPO-PEO ternary block copolymer is n is 88, m is 10, k is 3; the weight average molecular weight is 30w.

[0083] This embodiment provides a method for preparing a composite solid electrolyte, and the preparation method specifically includes the following steps:

[0084] (I) Add dibenzo-18-crown-6 crown ether, isopropanol and potassium hydroxide to the reactor, carry out vacuum dehydration for 5 times, pass through nitrogen gas to dilute the gas in the reactor three times after dehydration, weigh the ring according to the amount of polymerization Propylene oxide monomer and ethylene oxide monomer, add propylene oxide monomer to conduct primary polymerization at 100°C, add ethylene oxide monomer after the primary polymerization, and perform secondary polymerization at 115°C, after polymerization, use pumping Remove unreacted ethylene oxide monomer by vacuum and fill with nitrogen, ...

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Abstract

The invention provides an electrolyte matrix as well as a preparation method and application thereof. The electrolyte matrix comprises a PEO-PPO-PEO ternary block copolymer. According to the invention, the PEO-PPO-PEO ternary block copolymer is used as an electrolyte matrix, the film-forming property is good, the room-temperature ionic conductivity is high, and the room-temperature ionic conductivity is obviously higher than that of other conventional polymer electrolyte matrixes. The composite solid electrolyte provided by the invention takes the PEO-PPO-PEO ternary block copolymer as an electrolyte matrix and has the characteristics of high mechanical strength, good lithium dendrite resistance effect, excellent thermal stability and the like, an electrochemical stability window can reach 4V, and compared with a composite solid electrolyte prepared from other conventional polymer matrixes (PEO, PVDF, PAN or PMMA) at room temperature, the composite solid electrolyte prepared from the PEO-PPO-PEO ternary block copolymer has the higher ionic conductivity by one order of magnitude and can reach 4.5*10<-4> S / cm.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and relates to an electrolyte matrix, in particular to an electrolyte matrix, its preparation method and its use. Background technique [0002] Traditional liquid lithium-ion batteries have limited room for improvement, and it is generally believed that the ceiling is 400wh / kg. Therefore, it is particularly critical to develop new energy storage devices with high energy density. Solid-state lithium battery is a widely recognized next-generation battery technology, its theoretical energy density can reach 800wh / kg, and solid-state lithium battery will not suffer from thermal runaway, has higher safety performance, and has excellent application potential. [0003] Although solid-state lithium batteries have great advantages, the key component, solid-state electrolyte, is a key bottleneck restricting its commercialization. The current mainstream solid-state electrolytes are mainly div...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525C08G65/06C08G65/08
CPCY02P70/50
Inventor 黄科程冀亚娟陈规伟许鑫鑫刘金成刘建华
Owner EVE ENERGY CO LTD
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