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Hybrid chemical power supply device electrode and preparation method thereof

A chemical power source and hybrid technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc. problems, to achieve the effect of good consistency, high yield and reduced complexity

Active Publication Date: 2017-08-22
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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  • Hybrid chemical power supply device electrode and preparation method thereof
  • Hybrid chemical power supply device electrode and preparation method thereof
  • Hybrid chemical power supply device electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0084] Step 2, adding n-hexane as a dispersant, pre-mixing the dry powder material by ball milling, the speed of the ball mill is 1000r / min, the mixing temperature is 25°C, and mixing for 30 minutes;

[0085] Step 3, drying the pre-mixed slurry in step 2, removing the dispersant in the slurry, and obtaining a uniformly mixed dry material;

[0086] Step 4, adding toluene to the dry material, and pre-wetting with a ball mill;

[0087] Step 5, move the pre-wetted mixture into the kneading device, and add SBR particles (the ratio of the mass of SBR particles to the mass of the dry powder material is 8:92), and use the shearing and stretching action during high-speed rotation to make the material Fully contact with the binder to form a lump-shaped electrode active material raw material with a certain viscosity;

[0088] Step 6, pu...

Embodiment 2

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

[0094] Step 2, adding dichloromethane as a dispersant, and pre-mixing the dry powder material by ball milling, the speed of the ball mill is 1500r / min, the mixing temperature is 40°C, and mixing for 20 minutes;

[0095] Step 3, drying the pre-mixed slurry in step 2, removing the dispersant in the slurry, and obtaining a uniformly mixed dry material;

[0096] Step 4, adding ethanol to the dry material, and pre-wetting with a ball mill;

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

Embodiment 3

[0102] Step 1, lithium nickel manganese cobaltate (LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 ) and activated carbon are mixed according to the mass ratio of 50:50 to obtain a dry powder material;

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

[0104] Step 3, drying the pre-mixed slurry in step 2, removing the dispersant in the slurry, and obtaining a uniformly mixed dry material;

[0105] Step 4, adding water to the dry material, and pre-wetting with a ball mill;

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

...

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Abstract

The invention relates to a preparation method of an electrode of a hybrid chemical power device, which comprises the following steps: (1) Premixing of electrode active materials: uniformly mixing a lithium-containing compound, a carbon material and a conductive agent, and then kneading with a binder to obtain Agglomerated or powdered electrode active material raw materials; (2) preparation of electrode active material film: the agglomerated or powdered electrode active material raw material is passed through multi-stage rolling to obtain an electrode active material film of required thickness; (3) electrode active material film Forming: The thin film of electrode active material is supported on the current collector coated with the conductive polymer layer, and subjected to hot pressing treatment to obtain the electrode of the hybrid chemical power device. Compared with the prior art, the electrode prepared by the present invention has a compact structure, high tap density, high capacity, good consistency, and high reliability. This electrode is applied to hybrid chemical power devices and can significantly increase the electrode density. , Reduce internal resistance, improve life.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and relates to a hybrid chemical power device electrode and a preparation method thereof. Background technique [0002] Supercapacitor is a kind of chemical power supply. Due to its excellent characteristics such as high power density, high charge and discharge efficiency, long life, and wide operating temperature, it 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 application of supercapacitors is extremely limited, mainly due to the low energy density. In lithium-ion batteries, since lithium ions can be intercalated and intercalated in the positive and negative electrode materials, it has a high energy density; however, the speed of ion movement and the diffusion speed of lithium ions between electrode materials are extremely slow, which...

Claims

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Application Information

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