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Solidified composite electrolyte and preparation method thereof

A composite electrolyte, solid-state technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of complex preparation methods of gel polymer electrolytes, wide electrochemical windows, and complex preparation methods, and achieve wide electrochemical performance. Stable window, improved overall performance, and the effect of large adsorption capacity

Active Publication Date: 2013-06-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the low room temperature ionic conductivity of the inorganic all-solid electrolyte in the prior art, the electrochemical window is not wide, and the preparation method is complicated; the preparation method of the gel polymer electrolyte is complicated, the cost is high, and there are potential safety hazards. One of the purposes of the present invention One is to provide a solid-state composite electrolyte, which is a gel composite electrolyte

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  • Solidified composite electrolyte and preparation method thereof
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  • Solidified composite electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Preparation of in situ gel composite electrolyte

[0054] Under the protection of argon with a purity of ≥99%, 1 g of lithium bistrifluoromethanesulfonimide was dissolved in 5.15 g of N-methyl, propylpiperidine bistrifluoromethanesulfonimide salt ionic liquid to form Lithium-ion conductive ionic liquid electrolyte, measure 2.45ml of tetraethyl orthosilicate and 0.24ml of dibutyl phosphate and mix them, add 4.0ml of formic acid and stir for 10min to obtain a transparent mixed solution, add the mixed solution to the ionic liquid electrolyte and mix, The gel composite was obtained by aging for 12 hours under the protection of argon, and the gel composite was vacuum-dried at 80° C. for 48 hours to obtain an in-situ gel composite electrolyte.

[0055] It can be seen from the SEM test that the in-situ gel composite electrolyte prepared in Example 1 has a rich nanoporous network structure, and the ionic liquid electrolyte is confined in it in situ; the TG test shows that t...

Embodiment 2

[0063] (1) Preparation of in situ gel composite electrolyte

[0064] Under the protection of argon with a purity of ≥99%, 1 g of lithium bistrifluoromethanesulfonimide was dissolved in 5.15 g of N-methyl, propylpiperidine bistrifluoromethanesulfonimide salt ionic liquid to form Lithium-ion conductive ionic liquid electrolyte, measure 1.36ml of tetraethyl orthosilicate and 1.20ml of dibutyl phosphate, mix them, add 4.0ml of formic acid and stir for 10min to obtain a transparent mixed solution, add the mixed solution to the ionic liquid electrolyte and mix, The gel composite was obtained by aging for 12 hours under the protection of argon, and the gel composite was vacuum-dried at 80° C. for 48 hours to obtain an in-situ gel composite electrolyte.

[0065] figure 1 It shows that the in situ gel composite electrolyte prepared in Example 2 has a rich porous network and nanoparticle structure, and the ionic liquid electrolyte is confined in situ; figure 2 The middle TG test curv...

Embodiment 3

[0073] (1) Preparation of in situ gel composite electrolyte

[0074] Under the protection of argon with a purity of ≥99%, 1 g of lithium bistrifluoromethanesulfonimide was dissolved in 5.15 g of N-methyl, propylpiperidine bistrifluoromethanesulfonimide salt ionic liquid to form Lithium-ion conductive ionic liquid electrolyte, measure 0.27ml of tetraethyl orthosilicate and 2.17ml of dibutyl phosphate to mix, then add 4.0ml of formic acid and stir for 10min to obtain a transparent mixed solution, add the mixed solution to the ionic liquid electrolyte and mix, in The gel composite was obtained by aging for 12 hours under the protection of argon, and the gel composite was vacuum-dried at 80° C. for 48 hours to obtain an in-situ gel composite electrolyte.

[0075] It can be seen from SEM detection that the in-situ gel composite electrolyte prepared in Example 3 has a rich nanoporous network structure, and the ionic liquid electrolyte is confined in situ; TG shows that the initial t...

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Abstract

The invention relates to a solidified composite electrolyte and a preparation method thereof, and belongs to the technical field of lithium secondary battery electrolytes. The electrolyte is a gel composite electrolyte, and is formed by compounding a porous inorganic electrolyte network with an ionic liquid; and the electrolyte is the in-situ gel composite electrolyte formed by limiting an ionic liquid by a porous inorganic electrolyte network in situ or an ex-situ adsorption-type gel composite electrolyte formed by limiting an ionic liquid by a porous inorganic electrolyte network ex situ. The method adopts an ionic liquid to assist a sol-gel method, and the in-situ gel composite electrolyte, an all-solid-state electrolyte or the ex-situ adsorption-type gel composite electrolyte can be prepared in the different steps of one method. The electrolyte is in a porous network structure and a nano-particle size, represents high ionic conductivity, wide electrochemical stability window, good heat stability, chemical stability and mechanical strength, good film-forming property, and is easy to process and form; and the method is simple, low in consumption, energy-saving, green and environment-friendly.

Description

technical field [0001] The invention relates to a solid-state composite electrolyte and a preparation method thereof. The electrolyte is a gel composite electrolyte, which is a novel solid-state composite electrolyte for lithium ion conduction. The preparation method uses ionic liquid-assisted sol-gel method for synchronous synthesis The invention belongs to the technical field of lithium secondary battery electrolyte. Background technique [0002] Lithium secondary batteries have the advantages of high working voltage, high energy density, long cycle life and less environmental pollution, and have been widely used in portable electronic devices such as mobile phones, digital products and notebook computers; at the same time, lithium secondary batteries are used in electric vehicles And aerospace and other fields also have very broad application prospects. At present, due to the urgent need for high-power power batteries and the miniaturization of electronic devices, the ke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 陈人杰谭国强吴锋陈楠李丽陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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