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All-solid-state polymer electrolyte for surface chemical grafting inorganic particles and preparation method of all-solid-state polymer electrolyte

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: 2015-05-06
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-state polymer electrolyte for surface chemical grafting inorganic particles and preparation method of all-solid-state polymer electrolyte
  • All-solid-state polymer electrolyte for surface chemical grafting inorganic particles and preparation method of all-solid-state polymer electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Step 1: Dissolve 1.32 ml of ethyl silicate in 10 ml of ethanol to make solution A, dissolve 0.42 ml of deionized water in 10 ml of ethanol to make solution B, control the pH value at 3-4.5, drop solution B into solution A, after the dropwise addition, hydrolyze at 60°C for 2 hours, then add 0.1 g of silane coupling agent therein, and react at 80°C for 2 hours under nitrogen atmosphere to obtain sol particle reaction liquid.

[0021] 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, The molar ratio of polyoxyethylene methyl methacrylate to polydimethylsiloxane monomer is 1:1.5, and reacted at 90°C for 4 hours to obtain amorphous PEGMEM-co-PDMS-g-SiO 2 Nanocomposite reaction solution; the total reaction mass concentration of monomer polyoxyethylene methyl methacrylate and polydimethylsiloxane is 0.2 g / mL,...

Embodiment 2

[0025] Example 1 prepares an all-solid polymer electrolyte for a solid lithium-ion battery. The polymer is composed of polyethylene glycol methyl ether methacrylate monomer, polydimethylsiloxane and SiO 2 Polymerized complex and doped 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 conductivity is compared with that of 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

[0027] Step 1: Dissolve 2 ml of tetraethyl titanate in 10 ml of ethanol to make solution A, dissolve 0.53 ml of deionized water in 10 ml of ethanol to make solution B, control the pH value at 3 to 4.5, and make solution B Drop into solution A, 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 nitrogen atmosphere to obtain sol particle reaction solution.

[0028] 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, The molar ratio of polyoxyethylene methyl methacrylate to polydimethylsiloxane monomer is 1:1.5, react at 90°C for 4 hours, and obtain amorphous PEGMEM-co-PDMS-g-TiO 2 Nanocomposite reaction solution; the total reaction mass concentration of monomer polyoxyethylene methyl methacrylate and polydimethylsiloxane is...

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

Claims

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Application Information

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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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