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Binder solution for all solid state battery comprising a binder in form of particle and preparing method thereof

A binder solution, all-solid-state battery technology, applied in the manufacture of electrolyte batteries, binder types, conjugated diene binders, etc., can solve problems such as battery capacity, life and output characteristics deterioration

Pending Publication Date: 2021-12-17
HYUNDAI MOTOR CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the binder may cause deterioration of the capacity, life and output characteristics of the battery

Method used

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  • Binder solution for all solid state battery comprising a binder in form of particle and preparing method thereof
  • Binder solution for all solid state battery comprising a binder in form of particle and preparing method thereof
  • Binder solution for all solid state battery comprising a binder in form of particle and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 7 and comparative example 1 to 3

[0099] The binder solution was manufactured so as to have the composition described in Table 2 below.

[0100] Table 2

[0101]

[0102] The rubber-based adhesives of Examples 1 to 3 were analyzed for the degree of precipitation using dynamic light scattering (DLS). The results are shown in Figures 1A to 1C middle. Figure 1A The results of Example 1 are shown, Figure 1B The results of Example 2 are shown, Figure 1C The results of Example 3 are shown.

[0103] Such as Figures 1A to 1C As shown, the particle size distribution of the precipitated rubber-based adhesive decreases as the volume of the second solvent increases. This means that the rubber-based adhesive precipitates more uniformly as the volume of the second solvent increases.

[0104] Table 3 below shows the average diameter (D avg ) and polydispersity index (PDI).

[0105] The average diameter of the rubber-based adhesive (D avg ) and polydispersity index (PDI) were measured using the dynamic light s...

experiment example 1

[0110] Experimental Example 1 – Fabrication of Electrodes

[0111] Electrodes were produced using the binder solutions according to Examples 2 to 5. Manufacture of electrode paste comprising binder solution, LiNi as electrode active material 0.7 co 0.15 mn 0.15 o 2 , Super C65 as a conductive material and Li as a solid electrolyte6 P.S. 5 Cl. The electrode slurry contained 1.5wt% binder solution, 70.0wt% electrode active material, 1.0wt% conductive material and 27.5wt% solid electrolyte.

[0112] Each electrode paste was applied to a substrate to evaluate formability. The results are shown in Figures 2A to 2D middle. Figure 2A The results of Example 2 are shown, Figure 2B The results of Example 3 are shown, Figure 2C The results of Example 4 are shown, Figure 2D The results of Example 5 are shown. Such as Figures 2A to 2D As shown, all electrodes formed properly without cracking or breaking. Therefore, when the binder solution according to the present inven...

experiment example 2

[0113] Experimental Example 2 - Ratio of Electrochemical Area (B) of Electrode Active Material to Total Surface Area (A) of Electrode Active Material (B / A)

[0114] Electrodes were fabricated using the binder solutions of Examples 2 and 3. The electrochemical surface area of ​​each electrode was calculated using the galvanostatic intermittent titration technique (GITT). The results are shown in image 3 and Table 4 below.

[0115] Table 4

[0116] project Example 2 Example 3 Weight of electrode active material [g] 8.26 9.17 BET specific surface area of ​​electrode active material [cm 2 / g]

[0117] Such as image 3 As shown in Table 4, since the content (volume) of the second solvent in Example 3 was larger than that in Example 2, the rubber-based adhesive precipitated more uniformly. Therefore, the contact area between the solid electrolyte and the electrode active material increases, and the B / A value is high.

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Abstract

Disclosed are a binder solution for an all-solid-state battery including a binder in the form of particles, and a method of manufacturing the same. The binder solution may include a rubber-based binder, a first solvent for dissolving the rubber-based binder, and a second solvent in which the rubber-based binder is insoluble and which is miscible with the first solvent.

Description

technical field [0001] The present invention relates to a binder solution for an all-solid-state battery and a manufacturing method thereof, the binder solution comprising a binder in the form of particles. Background technique [0002] Electrodes for all-solid-state batteries contain electrode active materials and solid-state electrolytes. Electrodes can be fabricated using dry or wet methods. [0003] The dry method is a method of forming electrodes by pressing raw materials such as electrode active materials and solid electrolytes in powder form. The dry method is advantageous in that the manufacture of the electrode is simple, but since the dry method is a method of pressing a raw material in powder form to manufacture the electrode, it has a limitation that it is difficult to increase the size of the electrode. [0004] The wet method is a method of forming an electrode by applying and drying an electrode slurry containing raw materials such as an electrode active mat...

Claims

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Application Information

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IPC IPC(8): C09J109/02C09J115/00C09J109/06C09J109/00H01M4/62H01M4/13H01M10/0525H01M10/058
CPCC09J109/02C09J115/00C09J109/06C09J109/00H01M4/622H01M4/13H01M10/058H01M10/0525H01M10/0562H01M4/505H01M4/525H01M2300/0068H01M4/625Y02E60/10Y02P70/50H01M4/62C08L21/00C08L7/02C08L9/00C08L9/06C08L15/005C08J3/14H01M10/052H01M2300/008H01M2004/028H01M2004/027
Inventor 金箱谟李注妍权兑荣郑成厚郑允晳金圭太吴大洋
Owner HYUNDAI MOTOR CO LTD
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