A composite cathode for a solid-state battery and a preparation method thereof

A composite positive electrode and solid-state battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as poor capacity retention, low capacity of solid-state batteries, poor rate performance and cycle performance

Active Publication Date: 2019-01-01
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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  • A composite cathode for a solid-state battery and a preparation method thereof
  • A composite cathode for a solid-state battery and a preparation method thereof
  • A composite cathode for a solid-state battery and a 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 cathode for a solid-state battery. The composite cathode comprises a composite cathode sheet and an electrolyte membrane formed by coating solid-state electrolyteslurry on the composite cathode sheet. The composite cathode sheet is formed by coating composite cathode slurry on a cathode current collector. The solid-state electrolyte slurry comprises a polymerand a lithium salt in a mass ratio of 1 to 5. The composite positive electrode slurry comprises a positive electrode active material, a conductive agent, a binder, a polymer and a lithium salt in a mass ratio of 250 - 350: 5 - 35: 5 - 35: 1 - 5: 1. The invention effectively reduces the internal resistance of the interface, improves the interface impedance, reduces the ion transmission distance, thereby improving the capacity of the solid-state battery, effectively improving the tensile strength, and thus improving the capacity and safety performance of the solid-state battery. In addition, thesolid-state battery of the present invention is used in a plurality of battery systems such as NCM111, NCM523, NCM622, NCM811, LFP, LCO, and the like, and has a wide application range.

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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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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