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All-solid polymer electrolyte with surface chemically grafted inorganic particles and preparation method

An all-solid polymer and electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrochemical generators, etc., can solve the problems of low conductivity of solid polymer electrolytes, and achieve excellent battery performance and excellent conductivity. Effect

Active Publication Date: 2017-04-26
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of solid polymer electrolytes is low, and there is still room for improvement in high temperature stability and interfacial cycle stability.

Method used

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  • All-solid polymer electrolyte with surface chemically grafted inorganic particles and preparation method
  • All-solid polymer electrolyte with surface chemically grafted inorganic particles and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Dissolve 1.32ml of ethyl silicate in 10ml of ethanol to make solution A, dissolve 0.42ml of deionized water in 10ml of ethanol to make solution B, control the pH value at 3-4.5, drop B solution into A In the solution, after the dropwise addition, hydrolyze at 60°C for 2 hours, then add 0.1 g of silane coupling agent to it, and react at 80°C for 2 hours under a nitrogen atmosphere to obtain a sol particle reaction solution;

[0019] The second step: in the sol particle reaction solution prepared in the first step, add monomer polyoxyethylene methyl methacrylate, polydimethylsiloxane and initiator azobisisobutyronitrile with 30 oxyethylene segments, Wherein the molar ratio of polyoxyethylene methyl methacrylate to polydimethylsiloxane monomer is 1:1.5, and reacted at 90°C for 4 hours to obtain an amorphous nanocomposite reaction liquid; The total reaction mass concentration of methyl acrylate and polydimethylsiloxane is 0.2g / mL, and the mass concentration of initi...

Embodiment 2

[0023] Example 1 prepares an all-solid polymer electrolyte for a solid lithium-ion battery. The polymer is composed of monomer polyoxyethylene methyl methacrylate, polydimethylsiloxane and SiO 2 Polymerized composites doped with lithium trifluoromethanesulfonate (EO / Li=20 / 1), the number of oxyethylene segments of polyoxyethylene methyl methacrylate is 30, SiO 2 The content is 2% by mass fraction, and its electrical conductivity is compared with that of the ungrafted polymer electrolyte as figure 1 shown. From figure 1 It can be seen in the grafted SiO 2 Finally, the electrical conductivity of the solid-state polymer nanocrystalline particles obtained in Example 1 all improved at different temperatures, and at a high temperature of 100 degrees, the electrical conductivity was as high as 10 -3 , reaching the order of magnitude required for practical applications.

Embodiment 3

[0025] Step 1: Dissolve 2ml tetraethyl titanate in 10ml ethanol to make solution A, dissolve 0.53ml deionized water in 10ml ethanol to make solution B, control the pH value at 3-4.5, and drop solution B into A In the solution, after the dropwise addition, hydrolyze at 60°C for 2 hours, then add 0.1 g of silane coupling agent to it, and react at 80°C for 2 hours under a nitrogen atmosphere to obtain a sol particle reaction solution;

[0026] The second step: in the sol particle reaction solution prepared in the first step, add monomer polyoxyethylene methyl methacrylate, polydimethylsiloxane and initiator azobisisobutyronitrile with 30 oxyethylene segments, Wherein the molar ratio of polyoxyethylene methyl methacrylate to polydimethylsiloxane monomer is 1:1.5, react at 90°C for 4 hours to obtain an amorphous nano-composite reaction liquid; The total reaction mass concentration of methyl acrylate and polydimethylsiloxane is 0.2g / mL, and the mass concentration of initiator azobis...

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Abstract

The invention provides an all-solid-state polymer electrolyte for a solid lithium ion battery and a preparation method of the all-solid-state polymer electrolyte. The polymer refers to a complex formed by polymerizing a methacrylic acid methoxypolyethylene glycol monomer, polydimethylsiloxane and an inorganic oxide, and an organic lithium salt is doped into the polymer. The method comprises the following steps: separating and performing vacuum drying on inorganic acid alkyl ester sol containing silicon or titanium group, monomers polyoxyethylene methyl methacrylate and polydimethylsiloxane and an initiator, thereby obtaining a PEGMEM-co-PDMS-inorganic oxide nanocrystal; adding an organic lithium salt into an organic solvent 3, performing film forming on turbid liquid in a film casting mode, removing the solvent 3, and performing vacuum drying, thereby obtaining the all-solid-state polymer electrolyte. Compared with the prior art, the all-solid-state polymer electrolyte prepared by a chemical grafting method disclosed by the invention has excellent conductivity and battery performance.

Description

technical field [0001] The invention relates to an electrolyte and a preparation method for a lithium ion battery, in particular to an all-solid polymer electrolyte for a lithium ion battery and a preparation method. Background technique [0002] Electrolyte is an essential part of lithium-ion batteries. It not only plays the role of conducting current and transporting ions between the positive and negative electrodes, but also plays an important role in the specific energy, safety, cycle performance, rate performance and cost of the battery. the key influencing factors. [0003] At present, the electrolyte used in traditional lithium-ion secondary batteries is an organic liquid electrolyte. Because of its early research, mature technology and low cost, it occupies 90% of the current finished lithium-ion battery market. However, since the liquid electrolyte is an organic substance with a low flash point, it will ignite the electrolyte in the case of high current discharge o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565C08G83/00
CPCC08G83/00H01M10/0525H01M10/0565H01M10/058Y02E60/10
Inventor 韦伟峰张锦芳马骋陈立宝
Owner CENT SOUTH UNIV
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