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Preparation method and application of polymer-based solid electrolyte

A solid-state electrolyte and polymer technology, which is used in composite electrolytes, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., can solve the problems of increased polarization current and low cost, and achieves reduced cracks, low cost, and improved surface morphology. Effect

Inactive Publication Date: 2020-02-21
四川贝克特瑞科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention regulates the polymer crystallization process by adding inorganic substances to the organic polymer solid electrolyte of the garnet system, so that the morphology, structure and crystallinity of the polymer electrolyte are improved, thereby solving the problem of increasing the polarization current under high voltage ; and the method is simple in process and low in cost

Method used

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  • Preparation method and application of polymer-based solid electrolyte
  • Preparation method and application of polymer-based solid electrolyte
  • Preparation method and application of polymer-based solid electrolyte

Examples

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Effect test

Embodiment 1

[0035] A method for preparing a polymer-based solid electrolyte, comprising the following steps:

[0036] Step 1: Mix 1g polyethylene oxide (PEO), 500mg Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Powder (LLZTO) and 300mg lithium bistrifluoromethanesulfonimide (LiTFSI) were added to 10ml acetonitrile and stirred at 70°C for 12 hours to make the electrolyte a milky white gel.

[0037] Step 2: Add 20 mg of montmorillonite (MMT) into the solid electrolyte obtained in Step 1, and stir evenly.

[0038] Step 3: Use a dropper to evenly distribute the gel-like substance obtained in Step 2 on the polytetrafluoroethylene film, put it in an oven, and dry it at 70° C. for 12 hours to form a flexible solid electrolyte film.

Embodiment 2

[0040] According to the preparation method of the solid electrolyte in Example 1, only the montmorillonite in the preparation step 2 of the solid electrolyte was adjusted to 50 mg of tungsten disulfide, and the other steps remained unchanged.

Embodiment 3

[0042] According to the preparation method of the solid electrolyte in Example 1, only the montmorillonite in the preparation step 2 of the solid electrolyte was adjusted to 50 mg of molybdenum disulfide, and other steps remained unchanged.

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Abstract

The invention provides a preparation method and application of a polymer-based solid electrolyte, and belongs to the technical field of preparation of lithium ion battery materials. An inorganic matter is added into an organic polymer solid electrolyte of a garnet system to regulate and control a polymer crystallization process, so that the morphology structure and crystallinity of the polymer electrolyte are improved, and the problem that the polarization current of the polymer electrolyte is increased under a high voltage is solved. The method is simple in process and low in cost. The cyclicvoltammetry current of the lithium ion battery assembled by adopting the polymer solid electrolyte can still be controlled at 0A when the potential is as high as 5V, i.e., the lithium ion battery based on the electrolyte disclosed by the invention can still work stably under a relatively high voltage.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium ion battery materials, and in particular relates to a preparation method and application of a polymer-based solid electrolyte. Background technique [0002] Traditional lithium-ion battery electrolytes are usually liquid electrolytes such as carbonates or ethers. The electrochemical stability window of the liquid electrolyte is between 1 and 4.5V (v.s.Li / Li + ), when graphite, silicon, and lithium metal are used as negative electrode materials, an interface film (SEI film) will spontaneously form at the interface between the negative electrode material and the electrolyte due to potential mismatch. Lithium metal has a high energy density (3860mAh g -1 ), is the preferred anode material for the next generation of lithium-ion batteries, but during cycling, the SEI film formed with the liquid electrolyte is extremely unstable and uneven, combined with the low ion migration number of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565H01M10/0525
CPCH01M10/058H01M10/0565H01M10/0525H01M2300/0088Y02E60/10Y02P70/50
Inventor 雷天宇陈伟胡音李岚峰
Owner 四川贝克特瑞科技有限公司
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