High-rate high-safety soft package lithium-ion battery and preparation method thereof

A lithium-ion battery, high-safety technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problem of reducing the safety performance of lithium-ion batteries, not improving the lithium-ion conduction rate, not improving the lithium-ion transmission rate, etc. problems, to achieve the effect of reducing thermal runaway, preventing local overheating, and high safety performance

Inactive Publication Date: 2017-02-22
XIAMEN RIZHEN POWER TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The methods to improve the rate performance of lithium-ion batteries mainly include: 1) using rate-type positive and negative electrode materials, but at present due to the high technical difficulty, it is difficult to obtain a breakthrough; 2) using a functional electrolyte with high conductivity, according to the current R & D progress, it is difficult to make a big breakthrough; 3) The current collector bottom coating technology is adopted, that is, a layer of nano-conductive carbon is coated on the surface of the positive and negative electrode current collectors to increase the contact area between the active material and the current collector, thereby improving the lithium-ion battery. Rate performance; 4) Using a modified diaphragm, that is, coating a layer of functional material on the surface of the diaphragm to improve the rate performance and safety performance of the lithium-ion battery, such as a patent (CN105591055A) discloses a high-rate lithium-ion battery and its manufacturing method , and its preparation method is to prepare the winding core through the winding process of the diaphragm coated with the composite conductive layer, the positive electrode sheet and the negative electrode sheet, and the winding core is prepared through the processes of packaging, baking, liquid injection, hot and cold pressing, chemical formation, and volume separation. A high-rate lithium-ion battery is produced. The surface of the diaphragm is coated with a composite conductive layer. The conductive agent in the composite conductive layer is selected from at least one of superconducting carbon black, carbon nanotubes, carbon fibers, and graphene. The electron conductivity on the surface of the separator is improved, but the conduction rate of lithium ions is not improved, and the transmission rate of lithium ions under the condition of high rate is not improved. At the same time, due to the high internal temperature of the battery under the condition of large rate, It is easy to cause the diaphragm to melt and cause safety hazards, thereby reducing the safety performance of lithium-ion batteries

Method used

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  • High-rate high-safety soft package lithium-ion battery and preparation method thereof
  • High-rate high-safety soft package lithium-ion battery and preparation method thereof
  • High-rate high-safety soft package lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Weigh 20g of polyvinylidene fluoride and add it to 200g of N-methylpyrrolidone, stir evenly, add 55g of alumina and 25g of melamine cyanurate, and then disperse for 2 hours to obtain spraying liquid A; at the same time, weigh 30g of polyvinylidene fluoride Add vinyl fluoride to 200g of N-methylpyrrolidone, disperse evenly, then add 70g of lithium hexafluoroaluminate, and disperse for another 2 hours to obtain spray liquid B;

[0027] 2) Then spray the spraying liquid A on one side of the PP diaphragm with a thickness of 20 μm (the coating thickness is 3 μm) by a spraying machine. After drying, the diaphragm C is obtained, and then spray the spraying liquid B on the other side of the diaphragm C ( The coating thickness is 3 μm), and the composite separator D is obtained after drying;

[0028] 3) After that, the lithium iron phosphate positive electrode slurry (mass ratio: lithium iron phosphate: conductive agent SP: polyvinylidene fluoride: N-methylpyrrolidone = 93:3:...

Embodiment 2

[0031] 1) Weigh 10g of sodium carboxymethylcellulose and add it to 200g of N-methylpyrrolidone, stir evenly, add 60g of aluminum oxide and 30g of pentaerythritol melamine phosphate, and then disperse for 2 hours to obtain spraying liquid A; at the same time, weigh 20g of carboxymethylcellulose Add methyl cellulose sodium to 200g of N-methylpyrrolidone, after dispersing evenly, add 80g of lithium hexafluoroaluminate, and disperse for another 2h to obtain spray solution B;

[0032] 2) Then spray the spraying liquid A on one side of the PP diaphragm with a thickness of 20 μm (the coating thickness is 2 μm) by a spraying machine. After drying, the diaphragm C is obtained, and then spray the spraying liquid B on the other side of the diaphragm C ( The coating thickness is 2 μm), and the composite separator D is obtained after drying;

[0033] 3) After that, the lithium iron phosphate positive electrode slurry (mass ratio: lithium iron phosphate: conductive agent SP: polyvinylidene ...

Embodiment 3

[0036] 1) Weigh 30g of polyacrylic acid and add it to 200g of N-methylpyrrolidone, stir evenly, add 50g of alumina and 20g of ammonium polyphosphate, and then disperse for 2 hours to obtain spray liquid A; at the same time, weigh 40g of polyacrylic acid and add it to 200g In the N-methylpyrrolidone, after uniform dispersion, add 60g of lithium hexafluorotitanate, and then disperse for 2h to obtain spraying liquid B;

[0037] 2) After that, spray the spraying liquid A on one side of the PP diaphragm with a thickness of 20 μm (the coating thickness is 4 μm) by a spraying machine. After drying, the diaphragm C is obtained, and then spray the spraying liquid B on the other side of the diaphragm C ( The coating thickness is 4 μm), and the composite separator D is obtained after drying;

[0038]3) After that, the lithium iron phosphate positive electrode slurry (mass ratio: lithium iron phosphate: conductive agent SP: polyvinylidene fluoride: N-methylpyrrolidone = 93:3:4:150) is coa...

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Abstract

The invention discloses a high-rate high-safety soft package lithium-ion battery and a preparation method thereof. The high-rate high-safety soft package lithium-ion battery comprises a lithium-ion battery, wherein a negative pole piece, a composite diaphragm, a positive pole piece, electrolyte and a laminated aluminum film group thereof are arranged on the lithium-ion battery; the high-rate high-safety soft package lithium-ion battery is characterized in that the negative pole piece and the positive pole piece are separately prepared by coating slurry by a meshed current collector; the composite diaphragm is provided with a double-sided coating layer; a lithium-containing inorganic lithium compound is coated on the first side of the double-sided coating layer; aluminum oxide and functional matters thereof are coated on the other side of the double-sided coating layer. According to the positive and negative poles prepared by the meshed current collector and the composite diaphragm, a lithium ion transport distance between the pole pieces is shortened, the rate capability of the battery is improved, and the battery has the characteristics of excellent rate capability and high safety.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a high-rate, high-safety soft-pack lithium-ion battery and a preparation method thereof. Background technique [0002] Flexible packaging lithium-ion batteries are widely used in portable electronic devices, electric vehicles, energy storage and other fields due to their advantages of high energy density, long cycle life and high safety performance. And the improvement of fast charging requirements requires lithium-ion batteries to have higher energy density, high rate performance and cycle performance. [0003] The methods to improve the rate performance of lithium-ion batteries mainly include: 1) using rate-type positive and negative electrode materials, but at present due to the high technical difficulty, it is difficult to obtain a breakthrough; 2) using a functional electrolyte with high conductivity, according to the current R & D progress, it is difficult to make a big breakthroug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/14H01M2/16H01M4/64H01M4/74H01M10/058H01M50/403H01M50/431H01M50/457
CPCH01M4/64H01M4/745H01M10/0525H01M10/058H01M50/40H01M50/409H01M50/403H01M50/449Y02E60/10Y02P70/50
Inventor 袁万颂
Owner XIAMEN RIZHEN POWER TECH CO LTD
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