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A kind of electrode composite material of lithium ion battery and preparation method thereof

A lithium-ion battery and composite material technology, which is applied in the field of new energy materials, can solve the problem that parameters such as battery internal resistance, life, energy density and capacity cannot be substantially improved, and limit the structure and shape of curly batteries, small curvature changes, etc. problems, to achieve the effect of slowing the peeling phenomenon, improving the cycle stability and reducing the internal resistance

Active Publication Date: 2016-02-17
江苏海基新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even with thinner electrode composite materials, small curvature changes cannot be achieved, limiting the structure and shape of battery products such as rolled batteries
The mutual constraints of these existing technologies have caused parameters such as internal resistance, life, energy density and capacity of batteries in the prior art to be substantially improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 7g of polyvinylidene fluoride binder in 180g of N-methylpyrrolidone, stir and dissolve to form a colloidal solution, then add 140g of LiFePO 4 and 2.8g superfine carbon powder into the colloidal solution, and stir evenly with a mixer to make a paste-like positive electrode slurry. Fill the obtained positive electrode slurry into the multi-permeable pores of the current collector with a porosity of 90% by using the scraping method. The metal foam is made of aluminum material, and the current collector filled with the positive electrode material is placed in an oven at a temperature of 110°C. Dry for 4h. Take out and die-cast with a calender, with a thickness of 300 μm, wherein the thickness is determined according to the size of the battery. The die-cast material was calcined at 700° C. for 2 hours in nitrogen, cooled to room temperature and taken out to obtain a carbonized medium between the positive electrode material and the current collector. Coat a layer ...

Embodiment 2

[0022] Dissolve 7g of polyvinylidene fluoride binder in 180g of N-methylpyrrolidone, stir and dissolve to form a colloidal solution, then add Li:Fe with an atomic ratio of 1:2 and a total mass of 180g of Li 2 CO 3 and FePO 4 , and 2.5g ultra-fine carbon powder in absolute ethanol, grind for 4 hours and mix thoroughly, then add to the colloidal solution, and stir evenly with a mixer to make a paste-like positive electrode slurry. Fill the obtained positive electrode slurry into the multi-permeable pores of the current collector with a porosity of 90% by using the scraping method. The metal foam is made of aluminum material, and the current collector filled with the positive electrode material is placed in an oven at a temperature of 110°C. Dry for 4h. Take out and die-cast with a calender, with a thickness of 300 μm, wherein the thickness is determined according to the size of the battery. The die-cast material was calcined at 750° C. for 3 hours in nitrogen, cooled to room ...

Embodiment 3

[0024] Dissolve 7g of polyvinylidene fluoride binder in 180g of N-methylpyrrolidone, stir and dissolve to form a colloidal solution, and then add Li:Mn:C with an atomic ratio of 1:2:1 and a total mass of 180g of Li 2 CO 3 , MnO 2 and glucose, ground with 2.5g ultra-fine carbon powder for 4 hours, mixed thoroughly and added to the colloidal solution, stirred evenly with a mixer to make a paste-like positive electrode slurry. Fill the obtained positive electrode slurry into the multi-permeable pores of the current collector with a porosity of 90% by using the scraping method. The metal foam is made of aluminum material, and the current collector filled with the positive electrode material is placed in an oven at a temperature of 110°C. Dry for 4h. Take out and die-cast with a calender, with a thickness of 300 μm, wherein the thickness is determined according to the size of the battery. The die-cast material was calcined in nitrogen at 350°C for 2h, then at 700°C for 2h, cooled ...

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Abstract

The invention discloses an electrode composite material for a lithium ion battery and a preparation method thereof. The electrode composite material comprises a current collector, an electrode material, a carbonized medium and a porosity polymer adhesive; the current collector adopts metal foam with a plurality of penetration holes; the electrode material is filled in a plurality of penetration holes of the current collector; the carbonized medium is positioned between the current collector and the electrode material; and the porosity polymer adhesive is positioned on the surface of the current collector. The preparation method comprises the following steps of: mixing an adhesive, the electrode material and a conductive additive; filling the mixture into a plurality of penetration holes of the current collector; and drying, die-casting and calcining, coating the porosity polymer adhesive on the surface of the current collector after cooling, and drying to obtain the electrode composite material. According to the electrode composite material for the lithium ion battery and the preparation method thereof, which are provided by the invention, the circulating stability is improved, the electrode composite material has a good mechanical performance and a good bending resistance, the stripping phenomenon of the electrode material is effectively retarded and the performance and the service life of the battery are greatly improved.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to an electrode composite material of a lithium ion battery and a preparation method thereof. Background technique [0002] Traditionally, the preparation method of electrode composite materials for lithium-ion batteries is obtained by coating the electrode materials on metal foils with adhesives and forming them. The disadvantage of this method is that more adhesives are used in the coating process, resulting in Some electrode materials cannot be fully utilized, and high surface density electrode composite materials cannot be obtained. At the same time, the bonding force between the electrode material and the current collector is poor, which is prone to electrode peeling, reduces its mechanical reliability, and has limited bending rate. The application of electrode composite materials to battery products reduces the capacitance of the battery product, increases the int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/70H01M4/139
CPCY02E60/10
Inventor 成信刚
Owner 江苏海基新能源股份有限公司
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