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Negative electrode complex with high cycle performance, preparation method of negative electrode complex and lithium metal battery

A technology of cycle performance and complex, applied in the direction of lithium battery, electrode carrier/current collector, negative electrode, etc., can solve the problems of affecting battery cycle life, poor liquid absorption and liquid retention ability, unfavorable electrolyte content, etc., to improve the battery Cycle performance, slow stress release, and effect of improving battery cycle life

Active Publication Date: 2021-10-08
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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  • Negative electrode complex with high cycle performance, preparation method of negative electrode complex and lithium metal battery
  • Negative electrode complex with high cycle performance, preparation method of negative electrode complex and lithium metal battery
  • Negative electrode complex with high cycle performance, preparation method of negative electrode complex and lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1, the negative electrode complex of high cycle performance, such as figure 1 , figure 2 As shown, the negative electrode composite includes a substrate layer and a lithium metal layer attached to both sides of the substrate layer, the substrate layer is composed of a polymer region and a welding region located on one side of the polymer and parallel to the polymer region , the polymer area is provided with a PP film (polyolefin film), and the welding area is provided with a welding sheet. In this embodiment, the welding sheet is a copper mesh used for the current collector material, and the welding sheet is far away from the polyolefin film. The side exceeds the side 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. In the negative electrode composite, two layers of lithium sheets and a base material layer located between the two lithiu...

Embodiment 2

[0051] Embodiment 2, the negative electrode complex of high cycle performance, such as figure 1 , figure 2 As shown, the negative electrode composite includes a substrate layer and a lithium metal layer attached to both sides of the substrate layer, the substrate layer is composed of a polymer region and a welding region located on one side of the polymer and parallel to the polymer region , the polymer area is provided with a PP film (polyolefin film), and the welding area is provided with a welding sheet. In this embodiment, the welding sheet is a copper mesh used for the current collector material, and the welding sheet is far away from the polyolefin film. The side (the side close to the battery tab) exceeds the side of the lithium metal layer by 50mm, 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 base material la...

Embodiment 3～9

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

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

[0058]

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Abstract

The invention discloses a negative electrode complex with high cycle performance, a preparation method of the negative electrode complex and a lithium metal battery. The negative electrode complex comprises a base material layer and lithium metal layers located on the side faces of the two sides of the base material layer, the base material layer is composed of a polymer area and a welding area located on at least one side of the polymer area, the polymer area is provided with a polyolefin film, and the welding area is provided with a welding sheet. The prepared negative electrode complex can play a role of a negative electrode and also can play a role of a current collector, meanwhile, the complex is high in liquid absorption rate, and the electrolyte retention capacity of the battery can be remarkably improved, so that the battery capacity of the lithium metal battery is improved.

Description

technical field [0001] The present application relates to the field of lithium batteries, in particular to a negative electrode complex 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 battery life is much higher than that of lithium-ion batteries, so lithium metal batteries have great development potential. [0003] Lithium-ion batteries usually use carbon materials such as grap...

Claims

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Application Information

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Patent Type & Authority Applications(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