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High-safety lithium-iron-phosphate-type lithium ion battery and preparation method thereof

A lithium-ion battery and lithium iron phosphate technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problem of affecting the stability between positive and negative electrodes, increasing battery unsafe factors, and affecting the proportion of active materials, etc. problems, to achieve good cycle life characteristics, high energy density, and reduce the amount of use

Inactive Publication Date: 2017-10-27
高新峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the lithium iron phosphate lithium-ion battery produced by this process, the flat metal foil blocks the migration of ions on the A and B sides of the pole piece, and the imbalance of active materials on both sides affects the stability between the positive and negative pole pieces, causing the battery pole piece to be partially in the The state of overcharge and discharge increases the unsafe factors of the battery
The thickness of the pole piece is between 50-150um, the volume ratio and weight of the plane foil in the pole piece are relatively large, which affects the proportion of active materials and reduces the energy density; the safety performance is average; the manufacturing cost of the pole piece is relatively high

Method used

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  • High-safety lithium-iron-phosphate-type lithium ion battery and preparation method thereof
  • High-safety lithium-iron-phosphate-type lithium ion battery and preparation method thereof
  • High-safety lithium-iron-phosphate-type lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A high-safety lithium iron phosphate lithium-ion battery, the preparation method of which comprises the steps of:

[0039] S1. Send one end of the coiled non-porous steel strip raw material into the perforation system for processing to prepare a three-dimensional strip. The three-dimensional strip includes a metal foil body and flanging holes arranged on the body. The metal foil body is an aluminum strip , the flanging holes are perforated without blanking, and each flanging hole is arranged at an even interval, and the peripheries of the flanging holes in adjacent or adjacent rows respectively protrude toward the two sides of the metal foil body, and the protrusions The top is in the shape of a three-dimensional grid;

[0040] S2: The three-dimensional belt prepared in step S1 enters the dipping system through the guide wheel for processing, so that the surface of the three-dimensional belt is evenly coated with active material slurry, and then the three-dimensional be...

Embodiment 2

[0047] A high-safety lithium iron phosphate lithium-ion battery, the preparation method of which comprises the steps of:

[0048] S1. Send one end of the non-porous steel strip raw material into a perforation system for processing to prepare a three-dimensional strip. The three-dimensional strip includes a metal foil body and a flanging hole on the body. The metal foil body is a copper strip , the flanging holes are perforated without blanking, and each flanging hole is arranged at an even interval, and the peripheries of the flanging holes in adjacent or adjacent rows respectively protrude toward the two sides of the metal foil body, and the protrusions The top is in the shape of a three-dimensional grid;

[0049] S2: The three-dimensional belt prepared in step S1 enters the dipping system through the guide wheel for processing, so that the surface of the three-dimensional belt is evenly coated with active material slurry, and then the three-dimensional belt passes through th...

Embodiment 3

[0056] A high-safety lithium iron phosphate lithium-ion battery, the preparation method of which comprises the steps of:

[0057] S1. Send one end of the coiled non-porous steel strip raw material into the perforation system for processing to prepare a three-dimensional strip. The three-dimensional strip includes a metal foil body and flanging holes arranged on the body. The metal foil body is an aluminum strip , the flanging holes are perforated without blanking, and each flanging hole is arranged at an even interval, and the peripheries of the flanging holes in adjacent or adjacent rows respectively protrude toward the two sides of the metal foil body, and the protrusions The top is in the shape of a three-dimensional grid;

[0058] S2: The three-dimensional belt prepared in step S1 enters the dipping system through the guide wheel for processing, so that the surface of the three-dimensional belt is evenly coated with active material slurry, and then the three-dimensional be...

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Abstract

The invention provides a preparation method of a high-safety lithium-iron-phosphate-type lithium ion battery, which comprises the steps of: S1: preparing a three-dimensional band; S2: uniformly coating an active substance sizing agent on the surface of the prepared three-dimensional band by a sizing immersing system, and then enabling the three-dimensional band to become a wet-state pole plate by an inclined plate type sizing coating device above the sizing immersing system, wherein the active substance sizing agent comprises an active material and organic fibers; S3: after carrying out drying, pressing and cutting on the wet-state pole plate, respectively preparing a positive plate and a negative plate; and S4: oppositely placing the positive plate and the negative plate, arranging a diaphragm between the positive plate and the negative plate to form an electrode component, assembling the the electrode component into a shell, and injecting electrolyte into the shell. The prepared lithium-iron-phosphate-type lithium ion battery shows the characteristics of very high energy density and excellent cycle life, and is excellent in safety performance; meanwhile, thicknesses of the plates are greatly increased; the number of layers of the plates is reduced; the use amounts of the diaphragm and a current collection carrier are reduced; manufacturing efficiency is improved; and production cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a high-safety lithium iron phosphate lithium ion battery and a preparation method thereof. Background technique [0002] The main characteristics of lithium-ion battery products are: large volume specific capacity, high mass specific energy, high discharge platform; long cycle life, no memory effect, small self-discharge; environmental protection and no pollution. [0003] The current collectors of the positive and negative electrodes of traditional lithium-ion batteries use flat foils, and the positive and negative electrode materials are coated on the flat foils using a coating process. In the lithium iron phosphate lithium-ion battery produced by this process, the flat metal foil blocks the migration of ions on the A and B sides of the pole piece, and the imbalance of active materials on both sides affects the stability between the positive and negative pole pieces, causing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/70H01M4/62H01M4/58H01M10/058H01M10/0525
CPCH01M4/5825H01M4/62H01M4/70H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 高新峰袁华高宁宁吴治国胡高磊李浩
Owner 高新峰
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