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Composite positive electrode for solid-state battery and preparation method thereof

A composite positive electrode and solid-state battery technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of low capacity, poor capacity retention rate, poor rate performance and cycle performance of solid-state batteries, and reduce ion transmission. Distance, reduce interface internal resistance, and wide application range

Active Publication Date: 2022-04-01
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that the capacity of the solid-state battery is still low, the capacity retention rate is still poor, and the rate performance and cycle performance are all poor.

Method used

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  • Composite positive electrode for solid-state battery and preparation method thereof
  • Composite positive electrode for solid-state battery and preparation method thereof
  • Composite positive electrode for solid-state battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, a method for manufacturing a high-capacity solid-state battery

[0040] (1) Preparation of positive electrode slurry

[0041] Weigh 4.0g of positive electrode material LFP, 0.5g of conductive carbon black, and 0.5g of PVDF, pour them into the agate grinder, and grind for 20 minutes until uniform; weigh 15g of NMP into a weighing bottle, and slowly add the completely ground powder with a key, Add while stirring, after complete addition, adjust the magnetic stirring speed to 500rpm / min, stir for 6h, and obtain positive electrode slurry.

[0042] (2) Preparation of solid electrolyte slurry

[0043] Weigh 2.3g of polymer PEO, 0.7g of lithium salt LiTFSI, slowly add to the solvent acetonitrile, the amount of acetonitrile is 13.8g, magnetically stir at 500rpm / min for 5h to obtain a solid electrolyte slurry. (3) Preparation of composite positive electrode sheet

[0044] Weigh 0.35g of the solid electrolyte slurry prepared in step (2) and add it to the positive...

Embodiment 2

[0049] Embodiment 2, a method for manufacturing a high-capacity solid-state battery

[0050] (1) Preparation of positive electrode slurry

[0051] Weigh 4.5g of positive electrode material LFP, 0.25g of conductive carbon black, and 0.25g of PVDF, pour them into the agate grinder, and grind for 20 minutes until uniform; weigh 15g of NMP into a weighing bottle, and slowly add the completely ground powder with a key, Add while stirring, after complete addition, adjust the magnetic stirring speed to 500rpm / min, stir for 6h, and obtain positive electrode slurry.

[0052] (2) Preparation of solid electrolyte slurry

[0053] Weigh 2.3g of polymer PEO, 0.7g of lithium salt LiTFSI, slowly add to the solvent acetonitrile, the amount of acetonitrile is 13.8g, magnetically stir at 500rpm / min for 5h to obtain a solid electrolyte slurry.

[0054] (3) Preparation of composite positive electrode sheet

[0055] Weigh 0.35g of the solid electrolyte slurry prepared in step (2) and add it to t...

Embodiment 3

[0060] Embodiment 3, a method for manufacturing a high-capacity solid-state battery:

[0061] (1) Preparation of positive electrode slurry

[0062] Weigh 4.75g of positive electrode material LFP, 0.125g of conductive carbon black, and 0.125g of PVDF, pour them into the agate grinder, and grind for 20 minutes until uniform; weigh 15g of NMP into a weighing bottle, and slowly add the completely ground powder with a key, Add while stirring, after complete addition, adjust the magnetic stirring speed to 500rpm / min, stir for 6h, and obtain positive electrode slurry.

[0063] (2) Preparation of solid electrolyte slurry

[0064] Weigh 2.3g of polymer PEO, 0.7g of lithium salt LiTFSI, slowly add to the solvent acetonitrile, the amount of acetonitrile is 13.8g, magnetically stir at 500rpm / min for 5h to obtain a solid electrolyte slurry.

[0065] (3) Preparation of composite positive electrode sheet

[0066] Weigh 0.35g of the solid electrolyte slurry prepared in step (2) and add it ...

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Abstract

The invention relates to a composite positive electrode for a solid-state battery. The composite positive electrode includes a composite positive electrode sheet and an electrolyte membrane formed by coating the composite positive electrode sheet with a solid electrolyte slurry. The composite positive electrode sheet is formed by coating the composite positive electrode slurry on the positive electrode current collector. , the solid electrolyte slurry includes a polymer and lithium salt with a mass ratio of 1 to 5:1; the composite positive electrode slurry includes a positive electrode active material with a mass ratio of 250 to 350:5 to 35:5 to 35:1 to 5:1 , conductive agents, binders, polymers and lithium salts. The invention effectively reduces the interface internal resistance, improves the interface impedance, and reduces the ion transmission distance, thereby increasing the capacity of the solid-state battery, effectively increasing its tensile strength, thereby improving the capacity and safety performance of the solid-state battery. In addition, the solid-state battery of the present invention is used in multiple battery systems such as NCM111, NCM523, NCM622, NCM811, LFP, and LCO, and has a wide range of applications.

Description

technical field [0001] The invention belongs to the field of new energy, and in particular relates to a composite positive electrode for a solid-state battery and a preparation method thereof. Background technique [0002] At present, commercial lithium-ion batteries generally use organic liquid electrolytes and gel electrolytes, which inevitably introduce volatile, flammable, and explosive organic liquids into the battery system, which brings serious safety hazards to the battery system. Therefore, replacing the electrolyte with a solid electrolyte and developing an all-solid-state lithium-ion battery is the only way to fundamentally solve the safety problem. The structure of an all-solid-state battery includes a positive electrode, an electrolyte, and a negative electrode. The solid-state electrolyte acts as a separator to hinder electron transmission while conducting lithium ions, which greatly simplifies the battery construction process. [0003] In addition to solid-st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 尤春琴徐凯辰甘朝伦王峰
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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