A current collector, a pole piece and a lithium ion battery with a pore-forming functional coating

A technology for lithium ion batteries and current collectors, applied in the field of pole pieces, lithium ion batteries and current collectors, can solve the problems that the pores cannot be guaranteed to penetrate to the bottom of the active material coating, the uneven distribution of active materials in the membrane surface pits, and the high cost. , to improve cycle stability and power performance, enhance adhesion and electronic conductivity, and reduce usage

A technology for lithium ion batteries and current collectors, applied in the field of pole pieces, lithium ion batteries and current collectors, can solve the problems that the pores cannot be guaranteed to penetrate to the bottom of the active material coating, the uneven distribution of active materials in the membrane surface pits, and the high cost. , to improve cycle stability and power performance, enhance adhesion and electronic conductivity, and reduce usage

CN114464816BActive Publication Date: 2022-07-12REPT BATTERO ENERGY CO LTD +1
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  • A current collector, a pole piece and a lithium ion battery with a pore-forming functional coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve and disperse ammonium bicarbonate in NMP to form a functional coating slurry with a solid content (that is, mass concentration) of 10%. Use a coating machine to transfer the slurry to the surface of the aluminum foil, and then dry the coating at 30 °C to form a tape. Current collectors with functional coatings. The surface density of ammonium bicarbonate after double-sided coating and drying is 35g / m 2 .

Embodiment 2

[0033] Dissolve and disperse ammonium bicarbonate in deionized water to form a functional coating slurry with a solid content of 10%. Use a coating machine to transfer the slurry to the surface of the copper foil, and then dry the coating at 30 °C to form a functional coating. layer of current collectors. The surface density of ammonium bicarbonate after double-sided coating and drying is 20g / m2 2 .

Embodiment 3

[0035] Dissolve and disperse ammonium bicarbonate and PVDF in NMP at a mass ratio of 100:1 to form a functional coating slurry with a solid content of 10.1%. Use a coating machine to transfer the slurry to the surface of the aluminum foil, and then dry and coat at 30 °C. The layers form current collectors with functional coatings. The surface density of ammonium bicarbonate after double-sided coating and drying is 35g / m 2 , the PVDF areal density is 0.35g / m 2 .

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Abstract

The invention provides a current collector with a pore-forming functional coating, a pole piece and a lithium ion battery, and the current collector with a pore-forming functional coating, comprising a conductive base layer and a functional coating coated on at least one surface of the base layer layer, the functional coating contains a gas-generating compound whose decomposition temperature is below 250°C and can generate gas. The functional layer of the current collector of the present invention is coated with a compound with gas-generating and decomposing properties, which can produce through-holes through the coating by decomposing the gas-generating compound at the bottom of the active coating without affecting the existing coating process. , thereby improving the dynamic performance of battery products. The method is simple, easy to implement, low in cost, suitable for promotion and has high application value.

Description

technical field [0001] The present invention relates to the technical field of lithium ion battery manufacturing, in particular, to a current collector, a pole piece and a lithium ion battery with a pore-forming functional coating. Background technique [0002] Lithium-ion batteries have become one of the most widely used options in energy storage and power battery applications due to their high energy density and long service life. In order to obtain higher energy efficiency and reduce the manufacturing cost of batteries, lithium-ion batteries are often designed to increase the mass ratio of active materials and reduce the amount of auxiliary materials used. However, when the coating amount of active material is increased, the thickness of the coating will inevitably increase, resulting in a longer diffusion path of lithium ions in the battery, hindering the performance of materials close to the current collector, and ultimately affecting the kinetic performance of the batt...

Claims

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Application Information

Patent Timeline
12 Jul 2022
Publication
CN114464816B
IPC
H01M4/66; H01M4/80; H01M4/13; H01M10/0525
CPC
H01M4/667; H01M4/80; H01M4/13; H01M10/0525; Y02E60/10; H01M4/661; H01M4/663; H01M4/668
Inventors
曹辉; 侯敏