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Preparation method of positive electrode suitable for solid-state battery

A solid-state battery and positive electrode technology, applied in the field of positive electrode preparation of solid-state batteries, can solve the problems of insufficient performance, high viscosity of concentrated salt electrolyte, and large theoretical capacity of batteries, and achieves reduced polarization, excellent safety, and good resistance. oxidative effect

Pending Publication Date: 2021-12-21
TIANJIN SPACE POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the viscosity of the concentrated salt electrolyte is high, and the wettability of the electrode, especially the electrode with a large amount of coating, is poor, causing the capacity of the battery to be lower than the theoretical capacity of the cell, and the performance cannot be fully exerted, which limits the use of the concentrated salt electrolyte in lithium-ion / lithium batteries. application in

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0024] A positive electrode preparation method suitable for solid-state batteries involved in the present invention, the specific steps include:

[0025] S1, add solvent in homogenizing container, the amount of solvent used for preparing slurry is 50wt%~500wt% of slurry solid content; Then add adhesive, the total amount of adhesive in slurry is slurry solid content 0.1wt% to 30wt%; after fully stirring and dissolving, then add the conductive agent, the conductive agent accounts for 0.05wt% to 20wt% of the solid content of the slurry; after stirring evenly, add the positive active material powder, the positive active material powder accounts for the solid content of the slurry 50wt% to 99.85wt% of the content;

[0026] S2. Coat the uniformly stirred slurry on the aluminum foil, and the coating amount of the positive electrode is 30mg / cm 2 ~60mg / cm 2 ;Then dry at 100°C, form a positive electrode after rolling, and make a lithium-ion battery cell together with a separator and a...

Embodiment 1

[0036] S1. Add 5000g of NMP solvent to the homogenizer; then add 200g of PVDF-HFP and 100g of P(MV-MA) powder; after fully stirring and dissolving, add 100g of SP and 100g of VGCF; stir well and then add 500g LiCoO 2 powder;

[0037] S2. After stirring evenly, coat the slurry on the aluminum foil with a coating amount of 30mg / cm 2 , and then rolled at 100°C after drying. The prepared positive electrode is combined with a separator and a negative electrode to prepare a lithium-ion battery cell;

[0038] S3, add 45g DMC, 1.32g EC and 93.5g LiFSI to the container successively, form the concentrated salt electrolyte of 6.0mol / L after stirring evenly;

[0039] S4. Add the prepared concentrated salt electrolyte into the battery cell, and after sealing and standing for 48 hours, the battery can be charged and formed.

[0040] The theoretical capacity of the prepared battery cell is 10.5Ah; the test battery A adopts the cell and the concentrated salt electrolyte prepared by the sc...

Embodiment 2

[0045] S1. Add 500g of DMSO solvent to the homogenizer; then add 0.5g of PVDF-HFP and 0.5g of P(MV-MA) powder; stir and dissolve, then add 0.5g of CNT; stir well and then add 998.5g of NCA powder;

[0046] S2. After stirring evenly, coat the slurry on the aluminum foil with a coating amount of 60mg / cm 2 , and then dried at 100°C and then rolled; the prepared positive electrode is used together with a separator and a negative electrode to prepare a lithium-ion battery cell;

[0047] S3, add 107g EMC, 2.5g FEC and 93.5g LiFSI successively in container, form the concentrated salt electrolyte of 3.5mol / L after stirring evenly;

[0048] S4. Add the prepared concentrated salt electrolyte into the battery, and after sealing and standing for 48 hours, the battery can be charged and formed.

[0049] The theoretical capacity of the prepared battery cell is 11.8Ah; the test battery B adopts the cell prepared in Example 2 and the concentrated salt electrolyte, and the battery capacity is ...

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Abstract

The invention belongs to the technical field of chemical power sources, and particularly relates to a preparation method of a positive electrode suitable for a solid-state battery. The method comprises the following steps: adding a solvent and an adhesive into a homogenate container, fully stirring for dissolving, and then adding a conductive agent and positive active material powder, wherein the positive active material powder accounts for 50-99.85% the weight of of the solid content of slurry; coating an aluminum foil with uniformly stirred slurry, wherein the coating amount of a positive electrode is 30-60 mg / cm<2>; then drying and rolling, and matching the prepared positive electrode with a diaphragm and a negative electrode to prepare a lithium ion battery cell; and adding a prepared concentrated salt electrolyte into the battery cell, sealing, standing, and carrying out charging formation on the battery. The prepared solid-state battery not only has excellent safety, but also is comparable to the existing lithium ion battery adopting the conventional electrolyte in the aspect of electrical performance.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a method for preparing positive electrodes suitable for solid-state batteries. Background technique [0002] Lithium-ion / lithium battery is one of the most widely used batteries at present. It has the advantages of high specific energy, high specific power, good low temperature performance, long life and no memory effect. [0003] Traditional lithium-ion batteries use flammable organic electrolytes. If an accident occurs inside or outside the battery during use, the battery may catch fire and explode. To deal with this problem, the use of non-flammable solid-state electrolytes is an effective means. Concentrated salt electrolyte (liquid state) is easy to prepare, has good thermal stability and is non-flammable, and belongs to the category of quasi-solid electrolyte. Compared with all-solid-state electrolytes, lithium-ion batteries use concentrated sal...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M4/13H01M4/62H01M10/0525
CPCH01M4/0409H01M4/139H01M4/13H01M4/623H01M10/0525H01M2004/028Y02E60/10Y02P70/50
Inventor 郑智勇靳士波韩立明王志茹
Owner TIANJIN SPACE POWER TECH CO LTD
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