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Anti-overcharge rate type positive pole piece, manufacturing method thereof and lithium ion battery based on anti-overcharge rate type positive pole piece

A technology for lithium-ion batteries and positive pole pieces, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as delithiation of positive electrode materials, and achieve the effects of improving conductivity, improving battery rate performance, and improving heat dissipation

Active Publication Date: 2021-07-27
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcharging will lead to excessive delithiation of the positive electrode material, and excess lithium will deposit on the surface of the negative electrode to form lithium dendrites, causing safety risks

Method used

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  • Anti-overcharge rate type positive pole piece, manufacturing method thereof and lithium ion battery based on anti-overcharge rate type positive pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] With N-methylpyrrolidone as solvent, CNT, nano-Ti 4 o 7 , nano-AlN, DDB, dispersant (the composite mass ratio of titanate coupling agent and PVP in the dispersant is 2:3) and the mass percentages are 1%, 1%, 2%, 0.5%, and 0.5% respectively. Compound Additive Slurry. Wherein, CNT is a mixture of multi-walled carbon nanotubes and single-walled carbon nanotubes in equal mass ratios. The specific configuration process is as follows: first dissolve the dispersant completely in N-methylpyrrolidone solvent, then add CNT, nano Ti 4 o 7 , nano-AlN, DDB powder, ultrasonic 10min until the powder is evenly dispersed, and the composite additive slurry is obtained.

[0061] A double planetary mixer is used to add positive electrode active materials, conductive agents, binders, and solvents, and the positive electrode slurry is prepared according to the conventional lithium ion battery homogenization method. The positive electrode active material is lithium iron phosphate, the co...

Embodiment 2

[0066] With N-methylpyrrolidone as solvent, CNT, nano-Ti 4 o 7 , nano-AlN, DDB, dispersant (the composite mass ratio of titanate coupling agent and PVP in the dispersant is 2:3) and the mass percentages are 1%, 1%, 2%, 0.5%, and 0.5% respectively. Compound Additive Slurry. Among them, CNT is a multi-walled carbon nanotube. The specific configuration process is as follows: first dissolve the dispersant completely in N-methylpyrrolidone solvent, then add CNT, nano Ti 4 o 7 , nano-AlN, DDB powder, ultrasonic 240min until the powder is uniformly dispersed, and a composite dispersant slurry is obtained.

[0067] A double planetary mixer is used to add positive electrode active materials, conductive agents, binders, and solvents, and the positive electrode slurry is prepared according to the conventional lithium ion battery homogenization method. The positive electrode active material is lithium iron phosphate, the conductive agent is conductive carbon black, and the binder is ...

Embodiment 3

[0071] With N-methylpyrrolidone as solvent, CNT, nano-Ti 4 o 7, nano-AlN, DDB, dispersant (the composite mass ratio of titanate coupling agent and PVP in the dispersant is 3:2) and the mass percentages are 1%, 1%, 2%, 0.5%, and 0.5% respectively. Compound Additive Slurry. Among them, CNT is a single-walled carbon nanotube. The specific configuration process is as follows: first dissolve the dispersant completely in N-methylpyrrolidone solvent, then add CNT, nano Ti 4 o 7 , nano-AlN, DDB powder, ultrasonic 30min until the powder is uniformly dispersed, and the composite additive slurry is obtained.

[0072] By spraying, the above-mentioned composite additive slurry is evenly sprayed onto the surface of the positive electrode current collector. The mass percentage of the composite additive per unit area and the positive electrode active material per unit area is 2.36%. The positive current collector is selected from carbon-coated aluminum foil. Dry and set aside.

[0073...

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Abstract

The invention discloses an anti-overcharge rate type positive pole piece, a manufacturing method thereof and a lithium ion battery based on the anti-overcharge rate type positive pole piece, and belongs to the technical field of lithium ion batteries. According to the invention, the method comprises: matching the positive pole slurry and the composite additive slurry for use, firstly mixing and then coating on the positive pole current collector, or sequentially coating on the positive pole current collector layer by layer and then drying and rolling after coating, to obtain the anti-overcharge rate type positive pole piece. The composite additive slurry is prepared by mixing the following components in percentage by mass: 0.1%-8% of an anti-overcharge additive, 0.1%-8% of a conductive additive, 0.1%-8% of a heat-conducting additive, 0.1%-1% of a dispersing agent and the balance of a solvent. The lithium ion battery comprises the anti-overcharge rate type positive pole piece, a negative pole piece, a diaphragm and electrolyte, wherein the diaphragm is arranged between the anti-overcharge rate type positive pole piece and the negative pole piece. According to the invention, the heat dissipation performance of the battery under a high-rate use condition is remarkably improved, and meanwhile, the safety problem caused by overcharge and overdischarge can be well solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an anti-overcharge rate type positive pole piece, a manufacturing method thereof, and a lithium ion battery based on the same. Background technique [0002] Lithium-ion batteries have outstanding advantages over other types of secondary batteries in terms of energy density and service life. With the promotion of military / civilian application scenarios such as new energy vehicles, drones, start-stop power supplies, and electromagnetic ejection power devices, lithium-ion batteries are required to have excellent rate discharge performance and safety performance. [0003] The composition and structure of the positive electrode sheet have a great influence on the rate discharge performance of lithium-ion batteries. When discharging at a high rate, the positive pole piece is required to have good conductivity to reduce the polarization caused by the high resistivity of the...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139H01M4/13H01M4/62H01M10/0525H01M10/42H01M10/613H01M10/653H01M10/654
CPCH01M4/0404H01M4/139H01M4/13H01M4/62H01M4/624H01M10/0525H01M10/4235H01M10/613H01M10/653H01M10/654Y02E60/10
Inventor 胡朝文邵乐田占元张秦怡高昕瑾胡秋晨
Owner SHAANXI COAL & CHEM TECH INST
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