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Anode composite with high cycle performance and preparation method thereof, and lithium metal battery

A cycle performance and composite technology, applied in lithium batteries, electrode carriers/collectors, negative electrodes, etc., can solve problems affecting battery cycle life, insufficient electrolyte content, unfavorable electrolyte content, etc., to improve battery cycle performance , Improve battery cycle life, prevent wrinkles

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

[0004] However, compared with the graphite negative electrode, the liquid absorption and retention capacity of lithium metal is extremely poor, which is not conducive to increasing the electrolyte content in lithium metal batteries, and the electrolyte content is insufficient, and the electrolyte content affects the cycle life of the battery. Excellent liquid absorption and retention capacity will help improve battery cycle life

Method used

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  • Anode composite with high cycle performance and preparation method thereof, and lithium metal battery
  • Anode composite with high cycle performance and preparation method thereof, and lithium metal battery
  • Anode composite with high cycle performance and preparation method thereof, and lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1, a negative electrode composite with high cycle performance, such as figure 1 , figure 2 As shown, the negative electrode composite includes a base material layer and a lithium metal layer attached to both sides of the base material layer, and the base material layer consists of a polymer region and a welding region located on one side of the polymer and parallel to the polymer region. , a PP film (polyolefin film) is arranged on the polymer area, and a welding sheet is arranged on the welding area. The side exceeds the side edge of the lithium metal layer by 40 mm, and the overlapping area of ​​the welding sheet and the lithium metal layer accounts for 10% of the total area of ​​the lithium metal layer. In the negative electrode composite, two layers of lithium sheets and a substrate layer located between the two lithium sheets are rolled and composited into one by rolling composite.

[0047] Wherein, the surface of the PP film is provided with a liquid ab...

Embodiment 2

[0051] Example 2, a negative electrode composite with high cycle performance, such as figure 1 , figure 2 As shown, the negative electrode composite includes a base material layer and a lithium metal layer attached to both sides of the base material layer, and the base material layer consists of a polymer region and a welding region located on one side of the polymer and parallel to the polymer region. , a PP film (polyolefin film) is arranged on the polymer area, and a welding sheet is arranged on the welding area. The side (the side close to the battery tab) exceeds the side of the lithium metal layer by 50 mm, and the overlapping area of ​​the welding sheet and the lithium metal layer accounts for 5% of the total area of ​​the lithium metal. In the negative electrode composite, two layers of lithium sheets and a substrate layer located between the two lithium sheets are rolled and composited into one by rolling composite.

[0052] Wherein, the surface of the PP film is p...

Embodiment 3～9

[0056] Examples 3 to 9, the negative electrode composites with high cycle performance, differ from Example 1 in that the selection of each raw material component in the liquid absorbing layer and the corresponding amount thereof are shown in Table 1.

[0057] The raw material components of the liquid absorbing layer in the negative electrode current collectors in Examples 1 to 9 in Table 1 and their corresponding amounts (kg)

[0058]

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PUM

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Abstract

The invention discloses a negative electrode composite with high cycle performance, a preparation method thereof, and a lithium metal battery. The negative electrode composite includes a base material layer and a lithium metal layer located on both sides of the base material layer, the base material layer is composed of a polymer region and a welding region located on at least one side of the polymer region, and the polymer region is provided with a polymer region. Olefin film, the welded area is provided with a welded sheet. The negative electrode composite prepared by the present application can not only play the role of negative electrode, but also can play the role of current collector, and at the same time, the composite body has high liquid absorption rate, which can significantly increase the electrolyte liquid retention capacity of the battery, thereby improving the lithium metal The battery capacity of the battery.

Description

technical field [0001] The present application relates to the field of lithium batteries, in particular to a negative electrode composite with high cycle performance, a preparation method thereof, and a lithium metal battery. Background technique [0002] Lithium metal batteries include lithium ion batteries and lithium metal batteries. During the charging process of lithium metal batteries, uneven lithium deposition is likely to occur on the negative electrode, resulting in poor safety performance and cycle performance. Therefore, lithium-ion batteries with relatively stable performance and long cycle life are more widely used, and their related technologies are more mature. However, compared with lithium-ion batteries, lithium metal batteries have higher energy density, and their endurance is much higher than that of lithium-ion batteries, so lithium metal batteries have great development potential. [0003] In lithium-ion batteries, carbon materials such as graphite are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/66H01M10/052H01M10/42
CPCH01M4/134H01M4/1395H01M4/668H01M10/052H01M10/4235H01M2004/027Y02E60/10
Inventor 许晓雄崔言明秦晨阳黄园桥
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD