A current collector and a lithium ion battery containing the current collector

Abstract

The invention discloses a current collector and a lithium ion battery containing the current collector. The current collector includes a conductive layer, an insulating layer and a reinforcing layer; there are two conductive layers, an insulating layer is arranged between the two conductive layers, and the conductive layer There is also a reinforcing layer for enhancing the conductivity between the insulating layer and the conductive layer, the reinforcing layer and the insulating layer are combined by vacuum electroplating or electrolytic plating; the conductive layer is made of metal material, and the thickness is 0.1 ~ 1μm; The layer is made of organic polymer insulating material with a thickness of 2-8 μm; the reinforcing layer is made of at least one of carbon-based conductive material and nano-conductive ceramic material with a thickness of 0.1-1 μm. In the present invention, an insulating layer is arranged between two conductive layers, and a reinforcing layer is arranged between the conductive layer and the insulating layer, which not only reduces the weight of the current collector, but also ensures the conductivity of the current collector and improves the toughness of the current collector. Improve product consistency and safety.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a current collector and a lithium ion battery containing the current collector. Background technique [0002] Due to the advantages of high energy density, high output power, long cycle life and low environmental pollution, lithium-ion batteries are not only widely used as power sources for portable electronic devices such as mobile phones, notebook computers, and digital cameras, but also as power sources for power tools, electric vehicles, etc. The device field has good prospects. A lithium-ion battery is composed of a positive electrode, a negative electrode and an electrolyte. The electrode sheet is an important part of the lithium-ion battery electrode. The current collector in the electrode sheet is the base metal for the positive or negative electrode of the battery to attach the active material. It is used for charging When the current is introd...

AI Technical Summary

Problems solved by technology

[0003] Existing current collectors are generally made of aluminum foil or copper foil materials, which can meet the manufacturing requirements of lithium-ion batteries, but there are still the following three defects: first, aluminum foil or copper foil materials The mass itself is relatively large, which increases the weight of the lithium-ion secondary battery as a current collector; second, the aluminum foil or copper foil material has the characteristics of brittleness and low toughness, which leads to the coating, During the drying and slicing process, there will be breakage, broken edges, burrs and other undesirable phenomena, and there will be poor product consistency and safety problems; third, when the battery is subjected to external shocks such as acupuncture, it is very easy to cause an internal short circuit of the battery, which will cause battery damage. Safety accidents such as fire and explosion

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