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Boron-containing polymer solid electrolyte and application thereof

A technology of solid electrolyte and composite electrolyte, which is applied in the direction of composite electrolytes, circuits, electrical components, etc., which can solve the problems of difficulty in meeting the application requirements of high-voltage electrode systems, low ionic conductivity, and low electrochemical window, and achieve excellent lithium ion conduction performance, reducing segmental crystallinity, and improving flexibility

Active Publication Date: 2020-12-04
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ion transport in the polymer solid electrolyte mainly occurs in the amorphous region, while the crystallinity of unmodified PEO at room temperature is high, resulting in a low ion conductivity of 10 -7 The order of magnitude of S / cm
At the same time, the electrochemical window of PEO is low, and it is difficult to meet the application requirements of today's high-voltage electrode systems.

Method used

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  • Boron-containing polymer solid electrolyte and application thereof
  • Boron-containing polymer solid electrolyte and application thereof
  • Boron-containing polymer solid electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, this embodiment provides a method for preparing a boron-containing polymer solid state electrolyte, which includes the following steps:

[0042]Weigh 1.236g of boric acid, 4.4g of PEG200, and 4.9g of mPEG350 respectively, add the three into the flask, stir at room temperature for 15min, vacuumize and keep it; after the degassing of the mixture is complete, heat and stir at 160°C for 4h, collect the product, Transfer to a glove box, weigh 1.0047g LiTFSI and mix it with the product, heat and dissolve at 150°C to obtain a boron-containing polymer solid electrolyte M1.

[0043] The method for preparing a polymer solid electrolyte membrane by using the above-mentioned boron-containing polymer solid electrolyte M1 is as follows:

[0044] Weigh 2g of boron-containing polymer solid electrolyte M1 and 4g of dimethyl sulfoxide, mix, heat and stir at 40°C for 2h to obtain a solution, weigh 4g of the solution and pour it onto the surface of a clean glass...

Embodiment 2

[0048] This embodiment provides a method for preparing a boron-containing polymer solid electrolyte, which includes the following steps:

[0049] Weigh 1.854g of boric acid, 7.5g of PEG200, and 4.2g of mPEG350 respectively, add the three into the flask and stir at room temperature for 15min, vacuumize and keep it. After the mixture is completely defoamed, heat and stir at 160°C for 4h, collect the product, and transfer to In the glove box, weigh 0.8612g LiTFSI and mix with the product, heat and dissolve at 150°C to obtain boron-containing polymer solid electrolyte M2. figure 1 Schematic diagram of the structure of the polymer electrolyte prepared for Example 2 of the present invention, specifically, the polymer electrolyte is an elastomer clamped by metal tweezers.

[0050] Using the boron-containing polymer solid electrolyte M2, adopt the same electrolyte membrane preparation method and button battery preparation method as in Example 1, and carry out EIS test and CV test, and...

Embodiment 3

[0052] This embodiment provides a method for preparing a boron-containing polymer solid electrolyte, which includes the following steps:

[0053] Weigh 1.236g of boric acid, 9.6g of PPG500, and 3.5g of mPEG350 respectively, add the three into the flask and stir at room temperature for 15min, vacuumize and keep it, after the mixture is completely defoamed, heat at 180°C and stir at 100rpm for 6h, collect the product, transfer Put it into a glove box, weigh 0.7177g LiTFSI and mix it with the product, heat and dissolve at 160°C to obtain the boron-containing polymer solid electrolyte M3.

[0054] Using the boron-containing polymer solid electrolyte M3, adopt the same electrolyte membrane preparation method and button battery preparation method as in Example 1, and carry out EIS test and CV test, and the measured ion conductivity of the boron-containing polymer solid electrolyte M3 is 0.37mS / cm, the electrochemical window is 4.5V. figure 2 The EIS test curve of the polymer elec...

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Abstract

The invention provides a boron-containing polymer solid electrolyte, which is composed of a boron-containing polymer and a lithium salt, wherein the boron-containing polymer is a cross-linked side chain polymer obtained by condensation of polyether diol, polyether monohydric alcohol and boric acid, and has the following structural general formula defined in the specification, m and n are the contents of different repetitive units in the polymer respectively, m is more than or equal to 0 and less than or equal to 1, n is more than or equal to 0 and less than or equal to 1, m + n is 1, the segment -R1 is at least one of the following structures defined in the specification, and the segment -R2- is at least one of the following structures defined in the specification.

Description

technical field [0001] The invention belongs to the field of lithium secondary batteries, and in particular relates to a boron-containing polymer solid state electrolyte and an application thereof. Background technique [0002] Compared with traditional liquid electrolyte lithium-ion batteries, polymer solid-state electrolyte lithium-ion batteries have the advantages of high energy density, good plasticity, no leakage, and good safety. Among them, the polymer solid electrolyte based on polyethylene oxide (PEO) has entered the stage of commercial application. [0003] The ether oxygen functional group in PEO can complex Li + , with the help of the short-range continuous segmental motion of the molecular chain, the Li in the polymer matrix + Transport and exhibit ion conductivity. However, the ion transport in the polymer solid electrolyte mainly occurs in the amorphous region, while the crystallinity of unmodified PEO at room temperature is high, resulting in a low ion con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0088Y02E60/10
Inventor 黄杰周星宇俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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