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A hybrid chemical power device electrode and its preparation method

A chemical power supply and hybrid technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem of inability to ensure the thickness of the surface material of the current collector, difficulty in ensuring consistent performance of the electrode sheet, and limited binding force of the electrode active material, etc. problem, to achieve the effect of good consistency, high yield and slow decay

Active Publication Date: 2019-03-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems include: (1) The tap density is low, and there are many pores inside the material. When it is actually used in a hybrid chemical power device, the electrode will be immersed in too much electrolyte, which is not good for improving the energy density of the power device; (2) The tap density of the electrode can be improved by rolling, but it is difficult to obtain the ideal tap density if the pressure is too small, and the electrode will wrinkle and deform if the pressure is too large, resulting in poor performance and poor practical application effect; (3) coating When coating materials, it is impossible to ensure that the thickness of the surface material of the current collector is uniform, and it is difficult to ensure that the performance of the electrode sheet is consistent; (4) the binding force between the electrode active materials is limited, which is not conducive to the improvement of the electrode life

Method used

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  • A hybrid chemical power device electrode and its preparation method
  • A hybrid chemical power device electrode and its preparation method
  • A hybrid chemical power device electrode and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Step 1, the lithium iron phosphate (LiFePO 4 1) Mix with activated carbon in a mass ratio of 2:8 to obtain a dry powder material;

[0084] Step 2: Add n-hexane as a dispersant, and pre-mix the dry powder materials by ball milling. The speed of the ball mill is 1000r / min, the mixing temperature is 25°C, and the mixing is 30min;

[0085] Step 3. Dry the pre-mixed slurry in step 2 to remove the dispersant in the slurry to obtain a uniformly mixed dry material;

[0086] Step 4. Add toluene to the dry material and pre-wet it with a ball mill;

[0087] Step 5. Move the pre-moistened mixture into the mixing and kneading device, and add SBR particles (the ratio of the mass of SBR particles to the mass of dry powder material is 8:92), and the shearing and stretching effects during high-speed rotation are used to make the material Fully contact with the binder to form the raw material of the electrode active material with a certain viscosity;

[0088] Step 6. Put the mixed raw material of...

Embodiment 2

[0093] Step 1, the lithium cobalt oxide (LiCoO 2 1) Mix with activated carbon according to the mass ratio of 25:75 to obtain dry powder material;

[0094] Step 2: Add dichloromethane as a dispersant, and pre-mix the dry powder materials with a ball mill method, the speed of the ball mill is 1500r / min, the mixing temperature is at 40°C, and the mixture is mixed for 20 minutes;

[0095] Step 3. Dry the pre-mixed slurry in step 2 to remove the dispersant in the slurry to obtain a uniformly mixed dry material;

[0096] Step 4. Add ethanol to the dry material and pre-wet it with a ball mill;

[0097] Step 5: Move the pre-wetted mixture into the mixing and kneading device, and add the CMC solution (the ratio of the mass of CMC in the CMC solution to the mass of dry powder material is 3:97), using the shearing and stretching effects during high-speed rotation, Make the material and the binder fully contact to form the raw material of the electrode active material with a certain viscosity;

[...

Embodiment 3

[0102] Step 1, the lithium nickel manganese cobalt oxide (LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 ) Mix with activated carbon in a mass ratio of 50:50 to obtain dry powder;

[0103] Step 2: Add acetone, and pre-mix the dry powder materials by ball milling. The speed of the ball mill is 800r / min, the mixing temperature is 30°C, and the mixing is for 10 minutes;

[0104] Step 3: Dry the pre-mixed slurry in Step 2 to remove the dispersant in the slurry to obtain a uniformly mixed dry material;

[0105] Step 4. Add water to the dry materials and pre-wet them with a ball mill;

[0106] Step 5: Move the pre-wetted mixture into the mixing and kneading device, and add PVDF emulsion (the ratio of the mass of PVDF in the PVDF emulsion to the mass of dry powder material 20:80), using the shearing and stretching effects during high-speed rotation, Make the material and the binder fully contact to form the raw material of the electrode active material with a certain viscosity;

[0107] Step 6. Put the mixed raw...

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Abstract

The invention relates to a preparation method of a hybrid chemical power supply device electrode. The preparation method comprises the steps of: (1) premixing of electrode active substances, wherein a lithium-containing compound, a carbon material and a conductive agent are mixed evenly and then kneaded with a binder in a mixed manner to obtain a lump of or powdery electrode active substance raw material; (2) preparing an electrode active substance thin film, wherein the lump of or powdery electrode active substance raw material is subjected to multi-stage rolling to obtain the electrode active substance thin film with required thickness; (3) forming an electrode, wherein the electrode active substance thin film is loaded on a current collector painted with a conductive polymer layer for hot-pressing treatment, so as to obtain the hybrid chemical power supply device electrode. Compared with the prior art, the hybrid chemical power supply device electrode prepared by the invention has the advantages of compact and tight structure, high tap density, high capacity, good consistency, high reliability and the like, and can significantly increase the electrode density, reduce internal resistance and prolong service life when being applied to a hybrid chemical power supply device.

Description

Technical field [0001] The invention belongs to the technical field of chemical power supplies, and relates to a hybrid chemical power device electrode and a preparation method thereof. Background technique [0002] Supercapacitors are a type of chemical power supply. Due to their excellent characteristics such as high power density, high charge and discharge efficiency, long life, and wide operating temperature, they can be widely used in transportation, new energy vehicles, industrial production, military equipment, aerospace technology and Renewable energy and other fields. [0003] However, the current applications of supercapacitors are extremely limited, the main reason being low energy density. In lithium-ion batteries, because lithium ions can be inserted and intercalated in the positive and negative materials, it has a higher energy density; however, the speed of ion movement and the diffusion speed of lithium ions between electrode materials are extremely slow, which lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/86
CPCY02E60/13
Inventor 郑俊生巩瑞奇金黎明章磊黄军郑剑平
Owner TONGJI UNIV
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