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Positive electrode plate and preparation method thereof and solid-state battery

A positive pole piece and solid-state electrolyte technology, which is applied in the direction of positive electrodes, battery electrodes, secondary batteries, etc., can solve the problems of poor toughness of the pole piece and affect the large-scale production, performance and application of solid-state batteries

Active Publication Date: 2022-07-15
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inorganic electrolyte itself is brittle, resulting in poor toughness of the pole piece, which seriously affects the mass production, performance and application of solid-state batteries.

Method used

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  • Positive electrode plate and preparation method thereof and solid-state battery
  • Positive electrode plate and preparation method thereof and solid-state battery
  • Positive electrode plate and preparation method thereof and solid-state battery

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preparation example Construction

[0038] A method for preparing a positive pole piece is one of the above-mentioned preparation methods for the positive pole piece, and the preparation method for the positive pole piece comprises the following steps:

[0039] Step S310 : under the condition that the dew point of the environment is lower than -70° C., the positive electrode active material, the sulfide solid electrolyte and the non-woven fiber particles are added to the solvent and mixed to obtain a positive electrode slurry.

[0040] Further, in terms of parts by mass, the parts by mass of the positive electrode active material are 80 parts to 92 parts, the parts by mass of the sulfide solid electrolyte are 4 parts to 10 parts, and the parts by mass of the non-woven fiber particles are 1 part. ~ 5 servings.

[0041] Specifically, the positive electrode material is selected from LiCoO 2 , LiNiO 2 , LiMnO 2 , LiNiCoAlO 2 , LiNiCoMnO 2 , xLi 2 MnO 3 -(1-x)LiMO 2 , LiMn 2 O 4 , LiNi 0.5 Mn 1.5 O 4 , L...

Embodiment 1

[0065] The preparation steps of the positive pole piece of the present embodiment are as follows:

[0066] (1) 1 g of NBR was added to 100 mL of toluene, and the binder was fully stirred to dissolve the binder to obtain a binder polymer material solution;

[0067] (2) Add 1 g of PP non-woven fiber particles with a median particle size of 20 nm to the polymer material solution, stir and disperse at high speed, prepare a PP suspension, and disperse for 2 hours;

[0068] (3) 5g 75Li 2 S-25P 2 S 5 Sulfide solid electrolyte was added to the above suspension, stirred and dispersed for 4 hours to prepare electrolyte mixed slurry;

[0069] (4) 92g LiCoO 2 The positive electrode active material and 1 g of conductive carbon black conductive agent were added to the electrolyte mixed slurry, and the mixture was stirred and dispersed for 5 hours to prepare the positive electrode slurry;

[0070] (5) Coating the positive electrode slurry on a 16 μm carbon-coated aluminum foil, and afte...

Embodiment 2

[0072] The preparation steps of the positive pole piece of the present embodiment are as follows:

[0073] (1) 1 g of NBR was added to 100 mL of toluene, and the binder was fully stirred to dissolve the binder to obtain a binder polymer material solution;

[0074] (2) Add 1 g of PP non-woven fiber particles with a median particle size of 20 nm to the polymer material solution, stir and disperse at high speed, prepare a PP suspension, and disperse for 2 hours;

[0075] (3) 7g 75Li 2 S-25P 2 S 5 Sulfide solid electrolyte was added to the above suspension, stirred and dispersed for 4 hours to prepare electrolyte mixed slurry;

[0076] (4) 90g LiCoO 2 The positive electrode active material and 1 g of conductive carbon black conductive agent were added to the electrolyte mixed slurry, and the mixture was stirred and dispersed for 5 hours to prepare the positive electrode slurry;

[0077] (5) Coating the positive electrode slurry on a 16 μm carbon-coated aluminum foil, and afte...

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Abstract

The present application relates to a positive electrode plate, a preparation method thereof, and a solid-state battery, belonging to the technical field of batteries. A positive electrode sheet includes a current collector and a positive electrode layer stacked on the current collector, and the positive electrode layer includes a positive electrode active material, a sulfide solid state electrolyte and non-woven fiber particles. The sulfide electrolyte powder of the positive pole piece of the traditional solid-state battery is relatively brittle after cold pressing, resulting in poor toughness and mechanical strength of the pole piece, which is not conducive to pole piece processing, affects the efficiency of battery cell manufacturing, and is difficult to large-scale industrial production. . The above-mentioned positive pole piece includes non-woven fiber particles, and the sulfide electrolyte is attached to the non-woven fiber particles, so that macroscopic cracks can be blocked when passing through the non-woven fiber particles, so that the toughness of the positive pole piece is greatly improved.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a positive electrode plate, a preparation method thereof, and a solid-state battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output power, high average output voltage, low self-discharge, no memory effect, fast charge and discharge, and excellent cycle performance. They have been widely used in portable electronic equipment, electric vehicles, and electric ships. , large-scale energy storage and other fields. [0003] It is difficult to further improve the energy density of the existing commercial lithium-ion battery system, and because it mainly uses a liquid electrolyte containing flammable organic solvents, it has serious potential safety hazards. When a lithium-ion battery is short-circuited, the internal energy of the battery will be released in the form of heat in a short time, and serious safety accide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/0562H01M10/0525
CPCH01M4/13H01M4/139H01M4/62H01M4/621H01M4/625H01M10/0562H01M10/0525H01M2004/028H01M2300/0068Y02E60/10
Inventor 金柳兵成建安黎张帅峰张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD