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Manufacturing method of high-capacity high-magnification high-safety lithium ion battery

A lithium-ion battery and manufacturing method technology, applied in the direction of electrolyte battery manufacturing, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of low capacity, low safety, and poor rate performance of power batteries, and achieve uniform current density. , the effect of increasing capacity and simple preparation

Inactive Publication Date: 2013-07-10
SHANDONG REALFORCE ENTERPRISES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a high-capacity, high-rate, high-safety lithium-ion battery manufacturing method, which solves the problems of low power battery capacity, poor rate performance, and low safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add an appropriate amount of NMP into the stirring pot, and then add powdered PVDF. The concentration of PVDF is 5%, and the stirring time of PVDF is 3 hours. After PVDF is completely dissolved in NMP, add silicon dioxide powder. The concentration of silicon dioxide 1%, the solution is ready for use. Use a coating machine to evenly coat the silica solution on the mesh aluminum foil and mesh copper foil current collector. The thickness of the silica powder on the mesh aluminum foil and mesh copper foil is 1 μm, and its porosity 50%, the pore size is 80nm, the positive electrode active material is lithium manganese oxide, the negative electrode active material is mesophase carbon microspheres (MCMB), and a 7568270 square lithium-ion battery is made with a capacity of 10Ah.

[0023] Manufacture of positive electrode sheets: Lithium manganate, binder, and conductive agent are configured into positive electrode slurry according to the formula ratio, and the positive ele...

Embodiment 2

[0027] Add an appropriate amount of NMP into the stirring pot, and then add powdered PVDF. The concentration of PVDF is 5%, and the stirring time of PVDF is 3 hours. After PVDF is completely dissolved in NMP, add silicon dioxide powder. The concentration of silicon dioxide Dissolve CMC in deionized water, the concentration of CMC is 1.0%, then add 1.5% SBR, after it is completely dissolved, add silica powder, the concentration is 1%, and the two solutions are prepared for use. The silicon dioxide solution is evenly coated on the meshed aluminum foil current collector with a coating machine, the thickness of the silicon dioxide powder on the meshed aluminum foil is 1.5 μm, the porosity is 50%, and the pore diameter is 80nm; The CMC solution of silicon oxide is uniformly coated on the mesh copper foil with a thickness of 1 μm, a porosity of 50%, and a pore size of 80 nm. The positive active material is nano-lithium iron phosphate, and the negative active material is mesophase ...

Embodiment 3

[0032] Add an appropriate amount of NMP into the stirring pot, and then add powdered PVDF. The concentration of PVDF is 6%, and the stirring time of PVDF is 5 hours. After PVDF is completely dissolved in NMP, add silicon dioxide powder. The concentration of silicon dioxide Dissolve CMC in deionized water, the concentration of CMC is 1.40%, then add 2.0% SBR, after it is completely dissolved, add silica powder, the concentration is 1%, and the solution is ready for use. Coat the silicon dioxide solution evenly on the meshed aluminum foil current collector with a coating machine, the thickness of the silicon dioxide powder on the meshed aluminum foil is 1 μm, the porosity is 50%, and the pore diameter is 80nm; The CMC solution of silicon is uniformly coated on the mesh-shaped copper foil with a thickness of 1.5 μm, a porosity of 50%, and a pore diameter of 80 nm. The positive active material is nano-lithium iron phosphate, and the negative active material is mesophase carbon m...

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Abstract

The invention discloses a manufacturing method of a high-capacity high-magnification high-safety lithium ion battery. A positive pole material, a netty current collector, a negative pole material, a diaphragm and an electrolyte are adopted, and the positive pole material and the negative pole material are applied to the current collector to prepare a pole piece and prepare the battery. The preparation method of the current collector comprises the following steps of: (1) in an agitator kettle, dissolving PVDF (polyvinylidene fluoride) or PTFE (polytetrafluoroethylene) into NMP (N-methylpyrrolidone), or dissolving CMC into deionized water, then adding SBR (styrene butadiene rubber), stirring for 3-6hours, then adding a power mixture of one or more of silicon dioxide and aluminum oxide, with a concentration of 0.5-2%, and stirring so that powder is uniformly dispersed in the PVDF solution; and (2) applying a glue solution of the powder to the netty current collector by using a coater, and baking with an oven, so that the thickness of the powder on the current collector is 0.5-3mu m. The manufacturing method of the high-capacity high-magnification high-safety lithium ion battery has the beneficial effects of being simple in preparation, easy for production, and suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a method for manufacturing a high-capacity, high-rate, high-safety lithium-ion battery. Background technique [0002] In the chemical power supply system, compared with traditional batteries, lithium-ion secondary batteries have high output voltage (3.6V), high energy density and long cycle life. Lithium-ion batteries have quickly become a member of the power supply market. With the gradual reduction of petroleum fuels, environmental pollution and the enhancement of people's awareness of environmental protection, the development of new hybrid electric vehicle batteries or pure electric batteries and corresponding battery technologies has been greatly developed. [0003] Lithium-ion batteries are composed of positive electrode, negative electrode, diaphragm, electrolyte, current collector and other parts. The current collector is very important as the ...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/80H01M10/058
CPCY02E60/10Y02P70/50
Inventor 赖见赵海刚蔡振勇
Owner SHANDONG REALFORCE ENTERPRISES
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