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Solid electrolyte, preparation method thereof and lithium ion battery

A solid electrolyte and electrolyte technology, applied in the field of electrolytes, can solve problems such as large grain boundary resistance, Li salt volatilization, and limited improvement effect, and achieve the effect of improving interface performance, reducing grain boundary resistance, and smooth ion conduction

Pending Publication Date: 2021-04-09
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also two main problems in oxide electrolytes: (1) there is a large grain boundary resistance between the grains in the electrolyte; (2) the physical contact between the positive and negative electrodes and the electrolyte is poor, which makes the oxide electrolyte Ionic conductivity and other properties are not ideal
In order to improve the ionic conductivity and other properties of the oxide electrolyte, the electrolyte can usually be doped with metal elements (Al, Nb, Ta, Ga, etc.) to make the structure produce vacancies, and it can be combined with high-temperature sintering treatment above 1100 ° C to make the electrolyte dense. However, long-term sintering at high temperature will easily cause the volatilization of Li salt, resulting in composition deviation, and the densification of the electrolyte obtained by this long-term high-temperature sintering is not complete, and there will still be a certain grain boundary resistance. Affects the transport of lithium ions. Therefore, conventional metal element doping and other methods have no obvious effect on improving the ionic conductivity of the electrolyte.
In addition, in order to solve the problem of poor physical contact between the oxide electrolyte and the electrodes (i.e., the positive and negative electrodes), the surface of the ceramic sheet is usually polished to make the surface as smooth and flat as possible, but the improvement effect is still limited.

Method used

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  • Solid electrolyte, preparation method thereof and lithium ion battery
  • Solid electrolyte, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Will Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3Electrolyte powder, ammonium carbonate and lithium chloride are mixed thoroughly according to the mass ratio of 8:0.2:0.5 and ball milled evenly, the ball milling speed is 500rpm, and the ball milling time is 3h; the mixture powder is pressed into flakes, and sintered at 850°C for 5h After cooling, the electrolyte precursor is obtained;

[0059] (2) Polyethylene oxide and LiTFSI were dissolved in acetonitrile according to a mass ratio of 9:4, and fully stirred to obtain a polymer electrolyte slurry; the electrolyte precursor was soaked in the polymer electrolyte slurry for 30 minutes, and dried at room temperature; 60 The solvent was removed by vacuum drying at ℃ to obtain a solid electrolyte, wherein the mass ratio of the electrolyte precursor to the polymer electrolyte was 8.5:1.

[0060] (3) Using the lamination process, the positive electrode sheet, the above-mentioned solid electrolyte and the negative electrode sheet are...

Embodiment 2

[0065] (1) Will Li 3 OCl electrolyte powder, PMMA microspheres and lithium oxide are fully mixed according to the mass ratio of 6.4:0.3:0.6 and ball milled evenly, the ball milling speed is 150rpm, and the ball milling time is 2h; the mixture powder is pressed into flakes and sintered at 800°C 3h cooling to obtain the electrolyte precursor;

[0066] (2) Combine styrene-butadiene rubber with LiPF 6 Dissolve in chloroform according to the mass ratio of 5.3:1.4, and fully stir to obtain a polymer electrolyte slurry; soak the electrolyte precursor in the polymer electrolyte slurry for 50 minutes, and dry at room temperature; vacuum dry at room temperature to remove the solvent to obtain a solid electrolyte, the SEM image of the surface of the solid electrolyte is shown in Figure 4 . Wherein, the mass ratio of the electrolyte precursor to the polymer electrolyte is 7:1;

[0067] (3) The positive electrode sheet, the above-mentioned solid electrolyte and the negative electrode ...

Embodiment 3

[0072] (1) Will Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 Electrolyte powder, ammonium bicarbonate and lithium phosphate are fully mixed according to the mass ratio of 7.4:0.2:0.7 and ball milled evenly, the ball milling speed is 400rpm, and the ball milling time is 12h; the mixture powder is pressed into flakes, and sintered at 900°C for 6h cooling to obtain the electrolyte precursor;

[0073] (2) Polyethylene glycol, LiBOB and plasticizer are dissolved in acetone according to the mass ratio of 3:1:1, and fully stirred to obtain the polymer electrolyte slurry; the electrolyte precursor is mixed in the polymer electrolyte slurry Soak for 15min, dry at room temperature; remove the solvent by vacuum drying at room temperature to obtain a solid electrolyte, the AC impedance diagram of the solid electrolyte is shown in Figure 5 . Wherein, the mass ratio of the electrolyte precursor to the polymer electrolyte is 8.1:1;

[0074] (3) The positive electrode sheet, the above-mentioned sol...

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Abstract

The invention relates to a solid electrolyte, a preparation method thereof and a lithium ion battery, the solid electrolyte comprises the following raw materials: an oxide electrolyte, and a sintering aid, a polymer and a lithium salt which are filled in the oxide electrolyte, the solid electrolyte provided by the invention has relatively small grain boundary resistance and good interface performance, when applied to a lithium ion battery, the solid electrolyte has high ionic conductivity, can effectively inhibit the growth of lithium dendrites, and improves the comprehensive properties such as safety, cyclicity and stability of the battery.

Description

technical field [0001] The invention relates to an electrolyte, in particular to a solid electrolyte, a preparation method thereof and a lithium ion battery. Background technique [0002] Among various commercial rechargeable and dischargeable chemical energy storage devices, lithium-ion batteries have the characteristics of high energy density and long service life. However, the volatile, flammable and explosive organic electrolyte is the main factor causing the safety problem of lithium ions. As the key material of all-solid-state lithium batteries, solid electrolytes can effectively improve the safety and stability of batteries due to their high mechanical strength, excellent density and ability to resist the growth of lithium dendrites to a certain extent. Solid electrolytes are used instead of electrolysis The development of all-solid-state batteries is an effective way to solve the battery safety problem. [0003] There are many kinds of solid electrolyte materials, ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082H01M2300/0085Y02E60/10
Inventor 张赵帅赵伟李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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