Preparation method of all-solid-state electrolyte battery and all-solid-state electrolyte battery

A solid electrolyte and electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, solid electrolytes, etc., can solve the problems of reducing interface impedance, energy consumption, bad interface modification layer, etc., to achieve capacity and cycle life improvement, performance Improved effect

Inactive Publication Date: 2020-03-27
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although LLZO itself has high ionic conductivity, the solid interface between LLZO and positive and negative electrode materials has always hindered the development and application of LLZO-based all-solid-state batteries.
However, the method of dropping the electrolyte reduces the safety of the battery, and the poor

Method used

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  • Preparation method of all-solid-state electrolyte battery and all-solid-state electrolyte battery
  • Preparation method of all-solid-state electrolyte battery and all-solid-state electrolyte battery
  • Preparation method of all-solid-state electrolyte battery and all-solid-state electrolyte battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing an all-solid electrolyte battery includes the following steps:

[0044] S1. Preparation of the solid electrolyte layer: drop concentrated nitric acid on the two surfaces of the well-fired and polished LLZO solid electrolyte sheet, treat them separately for 3 minutes, and then put the LLZO solid electrolyte sheet into absolute ethanol or isopropanol The surface is cleaned with a brush in a solvent, and then placed in an ultrasonic instrument for ultrasonic cleaning for 2 minutes, and finally an LLZO solid electrolyte ceramic sheet with a three-dimensional porous structure on both surfaces is obtained.

[0045] S2. Preparation of positive electrode slurry: ball mill the commercial ternary material (NMC532) to obtain nano-scale NMC532 ternary material, and then disperse it into a solution of α-terpineol and ethyl cellulose to form a flowing slurry.

[0046] S3. The combination of the positive electrode layer and the solid electrolyte layer: coating the prep...

Embodiment 2

[0054] A method for preparing an all-solid electrolyte battery includes the following steps:

[0055] S1. Preparation of solid electrolyte layer: Add 50% citric acid solution dropwise to the two surfaces of the well-fired and polished LLZO solid electrolyte sheet, treat them for 5 minutes, and then place the LLZO solid electrolyte sheet on The surface was cleaned with a brush in anhydrous ethanol or isopropanol solvent, and then placed in an ultrasonic instrument for ultrasonic cleaning for 1 min. Finally, an LLZO solid electrolyte ceramic sheet with a three-dimensional porous structure on both surfaces was obtained.

[0056] S2. Preparation of positive electrode slurry: ball milling commercial lithium iron phosphate (LFP) to obtain nano-scale LFP, which is then dispersed in a solution of α-terpineol and ethyl cellulose to form a flowing slurry.

[0057] S3. Combination of the positive electrode layer and the solid electrolyte layer: coating the prepared positive electrode slurry on ...

Embodiment 3

[0062] A method for preparing an all-solid electrolyte battery includes the following steps:

[0063] S1. Preparation of the solid electrolyte layer: drop a 50% mass fraction of citric acid solution onto the two surfaces of the well-fired and polished LLZO solid electrolyte sheet, treat them separately for 8 minutes, and then place the LLZO solid electrolyte sheet on The surface was cleaned with a brush in absolute ethanol or isopropanol solvent, and then placed in an ultrasonic instrument for ultrasonic cleaning for 3 minutes, and finally an LLZO solid electrolyte ceramic sheet with a three-dimensional porous structure on both surfaces was obtained.

[0064] S2. Preparation of positive electrode slurry: ball milling commercial lithium cobalt oxide (LCO) to obtain nano-scale LCO, which is then dispersed in a solution of α-terpineol and ethyl cellulose to form a flowing slurry.

[0065] S3. Combination of the positive electrode layer and the solid electrolyte layer: coating the prepar...

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Abstract

The invention discloses a preparation method of an all-solid-state electrolyte battery. The preparation method comprises the steps of preparing a solid-state electrolyte layer, preparing positive electrode slurry, compounding a positive electrode layer and the solid-state electrolyte layer, compounding a negative electrode layer and the solid-state electrolyte layer and the like. The invention provides a simple and convenient interface modification method of an all-solid-state battery. The three-dimensional porous structures are formed on the two surfaces of the solid electrolyte, so that thepositive electrode material and the negative electrode material are in good contact with the solid electrolyte, the interface impedance between the solid electrolyte and the positive electrode and between the solid electrolyte and the negative electrode is reduced, the utilization rate of the active material is increased, and the capacity and cycle life of the all-solid-state electrolyte battery are further improved. And the method does not need to additionally dropwise add an electrolyte, does not need to additionally construct an interface modification layer and perform low-temperature sintering, and is easy to operate and good in effect. The invention also discloses an all-solid-state electrolyte battery which comprises the solid-state electrolyte base layer, and the positive electrodelayer and the negative electrode layer which are arranged on two sides of the solid-state electrolyte base layer.

Description

Technical field [0001] The invention relates to the field of solid electrolyte batteries, in particular to a preparation method of an all solid electrolyte battery and an all solid electrolyte battery. Background technique [0002] The current commercial lithium-ion batteries mainly use organic electrolytes, but organic electrolytes have safety problems such as flammability and easy leakage, which makes lithium-ion batteries have great safety risks. All-solid-state batteries that replace organic electrolytes with non-flammable solid electrolytes are considered to have higher safety and higher specific energy, and have received widespread attention. [0003] Inorganic solid electrolytes are mainly divided into two categories: oxides and sulfides. Among them, lithium lanthanum zirconate (Li 7 La 3 Zr 2 O 12 , LLZO) has high ionic conductivity (10 -4 ~10 -3 S / cm), wide electrochemical window and stability to metal lithium, it is considered to be one of the most ideal electrolytes for ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058
CPCH01M10/0562H01M10/058H01M2300/0068Y02E60/10Y02P70/50
Inventor 赵瑞瑞蓝威杰范弘扬韦福鑫陈红雨
Owner SOUTH CHINA NORMAL UNIVERSITY
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