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A negative electrode current collector composite and its preparation method and lithium metal battery

A technology of current collectors and composites, applied in the direction of electrode carriers/current collectors, battery electrodes, secondary batteries, etc., can solve the problem of uneven surface Li peeling and deposition, high current at the connection, decreased charging cycle life of lithium batteries, and reduced electron conduction. In order to reduce the peeling off, inhibit the formation of dendrites, and reduce the quality

Active Publication Date: 2022-07-08
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A negative electrode current collector composite and its preparation method and lithium metal battery
  • A negative electrode current collector composite and its preparation method and lithium metal battery
  • A negative electrode current collector composite and its preparation method and lithium metal battery

Examples

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Embodiment 1

[0039] Embodiment 1, a lithium metal battery, comprising a positive electrode, an aluminum foil (a current collector of the positive electrode), a separator, and a composite of a negative electrode current collector.

[0040] like figure 1 As shown, the negative electrode current collector composite negative electrode current collector composite includes a negative electrode and a current collector. The negative electrode is a lithium metal layer, the current collector includes a polymer film, copper metal regions are arranged on both sides of the polymer film, copper metal layers are arranged on the copper metal regions, and the lithium metal layer is attached to the copper metal layer and away from the polymer On one side of the membrane, the lithium metal layer coincides with the size of the polymer membrane, and the current collector is prepared as follows:

[0041] S1: cut out the release paper film according to the shape of the copper metal area, cover the surface of th...

Embodiment 2

[0044] Example 2, a lithium metal battery, differs from Example 1 in that the area of ​​the copper metal layer in the current collector is 30% of the area of ​​the polymer film.

Embodiment 3

[0045] Example 3, a lithium metal battery, differs from Example 1 in that the area of ​​the copper metal layer in the current collector is 20% of the area of ​​the polymer film.

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Abstract

The invention relates to the field of lithium batteries, in particular to a negative electrode current collector composite and a preparation method thereof and a lithium metal battery. The negative electrode current collector composite body includes a negative electrode and a current collector, the negative electrode is a lithium metal layer, the current collector includes a polymer film, copper metal regions are arranged on both sides of the polymer film, and a copper metal layer is arranged on the copper metal region, and the lithium metal The layer is attached to the side of the copper metal layer away from the polymer film, and the area of ​​the copper metal layer is 20-70% of the area of ​​the polymer film, and the size of the lithium metal layer and the polymer film overlap. The lithium metal battery of the present application adopts the above current collector, which improves the energy density of the lithium metal battery, and also suppresses uneven lithium deposition on the surface of the negative electrode during the charging process of the battery, thereby improving the cycle life of the battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a negative electrode current collector composite and 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 the lithium battery is to realize the charging and discharging of the battery through the intercalation and deintercalation of lithium ions between the positive and negative electrodes. Since the active materials used in the positive and negative electrodes of the battery have poor conductivity, a current collector needs to be arranged on the electrodes to collect the current generated by the active materials and improve the conductivity of the electrodes. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/13H01M4/139H01M10/0525
CPCH01M4/668H01M4/667H01M4/661H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 崔言明许晓雄秦晨阳龚和澜
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD