Metal foil current collector for battery

A current collector and metal foil technology, applied in the field of electrochemistry, can solve the problems of high-efficiency electronic conduction network to reduce the internal resistance of the battery, no three-dimensional skeleton structure, difficult to load active particles, etc., to improve the high-current charge-discharge performance and cycle. Stability, reducing impedance characteristics, avoiding the effect of microscopic coalescence

Active Publication Date: 2020-06-12
TSINGHUA UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coating layers based on these materials partially improve the above existing technical problems, but it is still difficult to fully realize the preparation of high-efficiency current collectors, mainly based on two reasons
First of all, a large number of nanomaterials used for the coating layer have insufficient intrinsic conductivity, and it is difficult to reduce the internal resistance of the battery as an efficient electronic conduction network after forming a carbon layer, such as graphite oxide flakes, etc.; second, the above materials do not have a three-dimensional skeleton Insufficient structural and mechanical stability, such as reduced graphite oxide, carbon nanotubes and other materials are prone to stacking or aggregation, making it difficult to fully load active particles and maintain their structural stability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Obtain graphene carbon nanotube hybrid by high temperature chemical vapor deposition method, wherein graphene and carbon nanotube are connected by covalent bond, and its specific surface area is 500m 2 / g. The hybrid is dispersed in the water system, and LA132 acrylic binder is added for co-dispersion to form graphene carbon nanotube hybrid slurry. A metal foil current collector with a nano-carbon coating layer is obtained by coating the surface of the aluminum foil, wherein the content of the graphene carbon nanotube hybrid is 95%, and the thickness is 2.0 microns. The lithium iron phosphate electrode material coating is coated on the surface of the metal foil current collector. After the battery is assembled, the high-current charge and discharge performance of the battery can be significantly improved. The battery capacity of the lithium iron phosphate full battery under 1C discharge conditions is higher than that of ordinary aluminum foil. Battery inc...

Embodiment 2

[0015] Embodiment 2: Obtain graphene carbon nanotube hybrid by high temperature chemical vapor deposition method, wherein graphene and carbon nanotube are connected by covalent bond, and its specific surface area is 2500m 2 / g. The hybrid is dispersed in an N-methylpyrrolidone organic system, and a polyvinylidene fluoride binder is added for co-dispersion to form a graphene carbon nanotube hybrid slurry. A metal foil current collector with a nano-carbon coating layer is obtained by coating the surface of an aluminum foil, wherein the content of the graphene carbon nanotube hybrid is 20%, and the thickness is 20 microns. The lithium cobalt oxide electrode material coating is coated on the surface of the metal foil current collector. After the battery is assembled, it can significantly improve the high-current charge and discharge performance of the battery. The battery capacity of the lithium cobalt oxide full battery under 1C discharge conditions is higher than that of ordinar...

Embodiment 3

[0016] Embodiment 3: Obtain graphene carbon nanotube hybrid by high temperature chemical vapor deposition method, wherein graphene and carbon nanotube are connected by covalent bond, and its specific surface area is 1000m 2 / g. The hybrid is dispersed in a water system, and a polytetrafluoroethylene binder is added for co-dispersion to form a graphene carbon nanotube hybrid slurry. A metal foil current collector with a nano-carbon coating layer is obtained by coating the surface of the aluminum foil, wherein the content of the graphene carbon nanotube hybrid is 75%, and the thickness is 100 microns. The lithium cobalt oxide electrode material coating is coated on the surface of the metal foil current collector. After the battery is assembled, it can significantly improve the high-current charge and discharge performance of the battery. The battery capacity of the lithium cobalt oxide full battery under 1C discharge conditions is higher than that of ordinary aluminum foil Batt...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a metal foil current collector for a battery and belongs to the technical field of electrochemistry. The metal foil current collector is technically characterized in that a nano carbon coating is arranged on the surface of the metal foil current collector; and the coating contains a graphene carbon nanotube hybrid prepared through a high-temperature chemical vapor deposition method. Graphene and a carbon nanotube in the graphene carbon nanotube hybrid are connected through a form of a covalent bond, so that the metal foil current collector has excellent intrinsic conductivity and mechanical self-dispersion characteristics, and micro coalescence of a carbon nanostructure is avoided. In assembly and operation processes of the battery, direct mechanical bonding and conductive interconnection of the current collector and positive active material particles can be effectively improved and the wetting characteristics of an electrolyte can be strengthened through the nano carbon coating on the surface of the metal foil current collector; and the metal foil current collector has important value to reduction of the impedance characteristic of the battery and improvement of the high current charge-discharge capability and the cycling stability of the battery.

Description

[0001] field of invention [0002] The invention relates to a current collector material for batteries, in particular to an aluminum foil current collector, belonging to the technical field of electrochemistry. Background technique [0003] With the continuous development of society, the performance requirements for electrochemical energy storage devices are also increasing. On the one hand, the energy density requirements of batteries continue to increase to meet the needs of long battery life; on the other hand, the power performance of batteries also has important practical value in power batteries and other occasions. In the process of battery assembly and practicality, the current collector material of the battery, as one of the core components, assumes the role of the mechanical carrier of the active particle material and provides the electron migration channel. At present, in the preparation process of lithium-ion batteries, aluminum foil is mostly used as the positive...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66
CPCH01M4/663H01M4/667Y02E60/10
Inventor 黄佳琦李鹏张强
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products