Negative electrode current collector complex, preparation method thereof and lithium metal battery

Abstract

The invention relates to the field of lithium batteries, in particular to a negative electrode current collector complex, a preparation method thereof and a lithium metal battery. The negative electrode current collector complex comprises a negative electrode and a current collector, the negative electrode is a lithium metal layer, the current collector comprises a polymer film, copper metal areas are arranged on the two side faces of the polymer film, copper metal layers are arranged on the copper metal areas, the lithium metal layer is attached to the side, away from the polymer film, of the copper metal layer, and the area of the copper metal layer is 20-70% of the area of the polymer film; the lithium metal layer and the polymer film coincide in size. The lithium metal battery provided by the invention adopts the current collector, so that the energy density of the lithium metal battery is improved, uneven lithium deposition on the surface of a negative electrode is also inhibited in the charging process of the battery, and the cycle life of the battery is further prolonged.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a negative electrode collector composite, a preparation method thereof, and a lithium metal battery. Background technique [0002] Lithium batteries are generally divided into lithium ion batteries and lithium metal batteries, and their components include a positive electrode, a negative electrode, and a current collector corresponding to the positive electrode and the negative electrode. The working principle of a lithium battery is to charge and discharge the battery by intercalating and deintercalating lithium ions back and forth between the positive and negative electrodes. Since the active materials used in the positive and negative electrodes of the battery have poor conductivity, it is necessary to install a current collector on the electrodes to collect the current generated by the active materials and improve the conductivity of the electrodes. [0003] The positive ele...

AI Technical Summary

Problems solved by technology

However, the complete removal of the Cu substrate will bring many challenges, such as the inhomogeneity of the surface leading to uneven exfoliation and / or deposition of Li and the local presence of large currents at the junctions, resulting in a significant increase in the local temperature.

In addition, lithium becomes granular during cycling, greatly reducing its electronic conductivity

In addition, lithium metal batteries tend to produce uneven lithium deposition and form dendrites on the surface of the metal lithium anode during the charging process. On the one hand, it will cause a decrease in the charging cycle life of lithium batteries; Will puncture the separator and cause a short circuit in the battery

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