Metal foil current collector for battery

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

field of invention [0001] 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 [0002] 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 electr...

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