Composite current collector, and lithium ion secondary battery applying current collector

Abstract

The invention discloses a current collector, and an application of the current collector in a lithium ion battery, and concretely relates to a composite current collector, and a lithium ion secondary battery applying the current collector. The composite current collector comprises an upper metal layer, a lower metal layer and a nonmetal layer arranged between the upper metal layer and the lower metal layer, vacuum electroplating, electrolytic electroplating or composite bonding compounding is carried out between the upper metal layer and the nonmetal layer and between the nonmetal layer and the lower metal layer, and the thickness of the nonmetal layer is controlled to be 2-20 [mu]m; and the thickness of each of the upper metal layer and the lower metal layer is controlled to be 1-10 [mu]m. The above structure reduces the weight of the current collector and guarantees that the composite current collector have excellent tensile strength and excellent flexibility; the outer layer of the current collector is the metal layer, and has a conductive effect; and the above reasonable structure design substantially improves the mass energy density of the produced lithium ion secondary battery and effectively prolongs the cycle life of the battery.

Description

technical field [0001] The invention relates to a current collector and its application in a lithium ion battery, in particular to a composite current collector and a lithium ion secondary battery using the current collector. Background technique [0002] In the lithium battery manufacturing industry, current collectors need to be installed on the positive and negative electrodes of lithium-ion secondary batteries. Existing current collectors are generally made of aluminum foil materials, which can meet the requirements of lithium-ion secondary The manufacturing requirements of the battery, but there are still the following defects. On the one hand, because the aluminum foil material itself is heavy, the weight of the lithium-ion secondary battery is virtually increased. In addition, on the one hand, more importantly, its structural design is single, which makes the battery mass energy density low and reduces the battery cycle life. In addition, there are also multi-layer co...

AI Technical Summary

Problems solved by technology

[0002] In the lithium battery manufacturing industry, current collectors need to be installed on the positive and negative electrodes of lithium-ion secondary batteries. Existing current collectors are generally made of aluminum foil materials, which can meet the requirements of lithium-ion secondary The manufacturing requirements of the battery, but there are still the following defects. On the one hand, because the aluminum foil material itself is heavy, the weight of the lithium-ion secondary battery is virtually increased. In addition, on the one hand, more importantly, its structural design is single, which makes the battery mass energy density low and reduces the battery cycle life. In addition, there are also multi-layer composite current collectors in the prior art, but the structural design of each layer Unreasonable, high manufacturing cost, poor safety and reliability

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