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Preparation method of high-tap-density electrode materials

An electrode material and tap density technology, which is applied in electrode manufacturing, electrode rolling/calendering, etc., can solve the problems that the active material is easy to fall off, the thickness is difficult to reduce, and the density cannot be increased, so as to improve the energy density and electricity storage, The effect of reducing the attenuation of energy storage and reducing the coefficient of variation

Active Publication Date: 2018-06-12
周建功
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the present invention provides a method for preparing electrode materials with high tap density, which solves the problem that the density of active materials such as carbon powder cannot be increased and the thickness is difficult in the production process of semiconductor industries such as power batteries and capacitors in the prior art. reduction and the problem that the active material is easy to fall off

Method used

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  • Preparation method of high-tap-density electrode materials
  • Preparation method of high-tap-density electrode materials

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] S1, mixing lithium iron phosphate, carbon powder, and polypropylene binder in a mass ratio of 90:3:7 to prepare a mixture;

[0037] S2, stirring the mixture in S1 at room temperature and high speed to prepare a slurry;

[0038] S3, uniformly coating the slurry in S2 on the aluminum foil to make an electrode material;

[0039] S4, place the electrode material in S3 at a temperature of 40°C, and bake until the humidity of the slurry on the surface of the electrode material is about 20%;

[0040] S5. In a vacuum state, put the baked electrode material of S4 into an ultra-high pressure static pressure equipment with a pressure of 0.08 MPa, set the static pressure to 300 MPa, press until the pressure reaches 300 MPa, and hold the pressure for 5 minutes to obtain aluminum with a high tap density. electrode material.

Embodiment 2

[0042] S1, mixing lithium iron phosphate, carbon powder, and styrene-butadiene rubber emulsion binder in a ratio of 90:3:7 by mass to obtain a mixture;

[0043] S2, stirring the mixture in S1 at room temperature and high speed to prepare a slurry;

[0044] S3, uniformly coating the slurry in S2 on the copper foil to make an electrode material;

[0045] S4, place the electrode material in S3 at a temperature of 45°C, and bake until the humidity of the slurry on the surface of the electrode material is about 20%;

[0046] S5. In a vacuum state, put the baked electrode material of S4 into an ultra-high pressure static pressure equipment with a pressure of 0.1 MPa, set the static pressure to 400 MPa, press until the pressure reaches 400 MPa, and hold the pressure for 5 minutes to obtain copper with a high tap density. electrode material.

Embodiment 3

[0048] S1, mixing lithium iron phosphate, carbon powder, and SBR emulsion binder in a mass ratio of 90:3:7 to prepare a mixture;

[0049] S2, stirring the mixture in S1 at room temperature and high speed to prepare a slurry;

[0050] S3, uniformly coating the slurry in S2 on the lead plate to make an electrode material;

[0051] S4, place the electrode material in S3 at a temperature of 50°C, and bake until the humidity of the slurry on the surface of the electrode material is about 20%;

[0052] S5. In a vacuum state, put the baked electrode material of S4 into an ultra-high pressure static pressure equipment with a pressure of 0.1 MPa, set the static pressure to 600 MPa, press until the pressure reaches 600 MPa, and hold the pressure for 5 minutes to obtain lead with high tap density electrode material.

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Abstract

The invention relates to the field of preparation of electrode materials and super-capacitors, in particular to a reparation method of high-tap-density electrode materials. According to the method, bythe aid of a static ultrahigh pressure device, the electrode materials are processed under a vacuum condition, the tap density and the distribution uniformity of power battery active materials are remarkably improved, the sticking firmness of the active materials and substrates is enhanced, a deformation coefficient of the substrates and the falling off rate of the active materials such as carbonpowder in the use process are reduced, the energy density and the charge capacity of power batteries are effectively improved, stored energy attenuation of the power batteries is decreased in the useprocess, the service lives of the batteries are prolonged, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of electrode material preparation, and more specifically, to a method for preparing an electrode material with high tap density. Background technique [0002] As the country pays more and more attention to environmental pollution, the development of new energy pure electric vehicles has also made major breakthroughs. The problem is: the substrate is too thin to withstand heavy pressure, and the tap density and distribution uniformity of active materials such as carbon powder pasted on the lead, aluminum or copper substrate cannot be improved, resulting in the battery storage capacity cannot be effectively improved, and the resistance Too big, long charging time. Active materials such as carbon powder pasted on lead, aluminum or copper substrates are not firmly bonded to the substrate. During use, as the air temperature and temperature conditions change during charging and discharging, they will continue to fall off, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCH01M4/04H01M4/0435Y02E60/10
Inventor 周建功周经伦
Owner 周建功
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