Coating process for cathode material lithium iron phosphate and lithium ion battery thereof

A lithium ferrous phosphate and lithium ion battery technology, which is applied to secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of poor adhesion between lithium ferrous phosphate materials and current collector aluminum foil, and achieve a simple process. reliable results

Inactive Publication Date: 2011-01-05
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to solve the problem that the lithium iron phosphate material is not firmly bo...

Method used

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  • Coating process for cathode material lithium iron phosphate and lithium ion battery thereof
  • Coating process for cathode material lithium iron phosphate and lithium ion battery thereof
  • Coating process for cathode material lithium iron phosphate and lithium ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 18650

[0021] Embodiment Take the 18650 aluminum casing rate type lithium-ion battery as an example:

[0022] 1) Coating a layer of LiNi on the 18 micron aluminum foil 1 1 / 3 co 1 / 3 mn 1 / 3 AlO 2 It is the mixed slurry 2 of the active material, coated with a thickness of 22±2 microns, and dried. The ratio of the mixed slurry 2 is LiNi 1 / 3 co 1 / 3 mn 1 / 3 AlO 2 : PVDF (HSV900): C-B (V7): oxalic acid = 96: 2: 2: 0.008, the solvent is NMP (N-methylpyrrolidone);

[0023] 2) in LiNi 1 / 3 co 1 / 3 mn 1 / 3 AlO 2 A layer of mixed slurry 3 with lithium iron phosphate material as the active material is applied to the surface of the surface, and the coating thickness is 100±2 microns (single side), and dried. The proportion of mixed slurry 3 is LiFePO 4 : PVDF (HSV900): S-P: oxalic acid = 90: 7: 3: 0.01, the solvent is NMP (N-methylpyrrolidone), see Figure 1 .

[0024] 3) Use a roller press to compact the positive electrode to a thickness of 180 ± 2 microns (double-sided), cut the posit...

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Abstract

The invention discloses a coating process for a cathode material lithium iron phosphate and a lithium ion battery thereof. The coating process comprises the following steps of: coating a layer of mixed stock taking LixNiyCozMnpMqO2 as an active substance on a current collector aluminum foil, and oven-drying the mixed stock; and on such a basis, coating a layer of mixed stock taking the lithium iron phosphate material as the active substance, and oven-drying the mixed stock. The coating process for the lithium iron phosphate material can be applied to the production of cylindrical aluminum-shelled lithium ion batteries suitable for high-rate discharge, and has the advantages of solving the problem of material fall caused by poor bonding between the lithium iron phosphate material and the current collector aluminum foil and producing the high-quality rate-type lithium ion batteries, along with simplicity and reliability.

Description

technical field [0001] The invention relates to the field of manufacturing lithium-ion batteries, in particular to a coating process for a positive electrode lithium iron phosphate material and a lithium-ion battery. Background technique [0002] At present, nickel-cadmium batteries are mostly monopolized by nickel-cadmium batteries for portable electric tools, electric motors, and aircraft models, but because these batteries use toxic cadmium, they have serious pollution to the environment. The implementation of the Directive on the Prohibition of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (ROHS Directive) requires that electrical and electronic products placed on the EU market must not contain six hazardous substances including lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers, so Countries around the world are phasing out the production and use of nickel-cadmium batteries. Lithium-...

Claims

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Application Information

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IPC IPC(8): B05D7/14B05D7/24H01M4/04H01M10/36H01M10/40H01M4/36H01M4/48H01M4/50H01M4/52C01G53/04H01M4/38H01M2/26H01M50/531H01M50/533H01M50/534
CPCY02E60/10
Inventor 曹长河姚宇均潘美姿席敏杰王从伟
Owner NINGBO VEKEN BATTERY
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