负极片和电池

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By designing a negative electrode structure in a lithium-ion battery, the problem of wettability between the negative electrode material and the electrolyte was solved while improving the energy density of the lithium-ion battery. This improved the battery's energy density and ensured the performance enhancement of the battery.

CN224519874UActive Publication Date: 2026-07-17JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
Filing Date: 2025-05-06
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

In the process of improving the energy density of existing lithium-ion batteries, the poor wettability between the negative electrode material and the electrolyte leads to uneven lithium-ion insertion and extraction, which easily results in lithium plating.

Method used

A negative electrode structure is designed, including a current collector and a functional layer. The functional layer consists of a first active material region, a liquid-retaining region, and a second active material region along the thickness direction. By setting a liquid-retaining region between the active material regions, the wettability and conductivity of the electrolyte are improved.

Benefits of technology

While improving battery energy density, it also solved the problem of wettability between negative electrode material and electrolyte, improved the battery's liquid retention and conductivity, and ensured electrolyte uniformity and fast charging capability.

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Abstract

本申请涉及电池技术领域，具体涉及一种负极片和电池。该负极片包括集流体，集流体沿厚度方向至少一侧表面设置有功能层；沿负极片宽度方向，功能层依次包括第一活性物质区域、保液区域、第二活性物质区域。所提供的负极片通过对功能层进行特殊设计，将保液区域设置在第一活性物质区域和第二活性物质区域之间，可以将活性物质区域设置为较厚的状态，在提高电池能量密度的同时，还解决了因活性物质层较厚存在的负极材料与电解液浸润性较差的问题。同时，保液区域还可以提升负极材料的保水性能和导电性能。

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Claims

1. A negative electrode sheet characterized by comprising: The negative electrode includes a current collector, and a functional layer is disposed on at least one surface of the current collector along the thickness direction; Along the width direction of the negative electrode sheet, the functional layer sequentially includes a first active material region, a liquid-retaining region, and a second active material region; The first active material region includes a first active material layer and a second active material layer. The first active material layer is disposed on at least one surface of the current collector along the thickness direction, and the second active material layer is disposed on the surface of the first active material layer away from the current collector. The second active material region includes a third active material layer and a fourth active material layer. The third active material layer is disposed on at least one surface of the current collector along the thickness direction, and the fourth active material layer is disposed on the surface of the third active material layer away from the current collector. The liquid-retaining area includes a first liquid-retaining layer.

2. The negative electrode sheet according to claim 1, characterized by The width of the first active material region is the same as the width of the second active material region.

3. The negative electrode sheet according to claim 1, characterized by The ratio of the width of the first active substance region to the width of the liquid-retaining region is (6-75):1; And / or, the ratio of the width of the second active material region to the width of the liquid-retaining region is (6-75):

1.

4. The negative electrode sheet according to claim 1, characterized by The width of the first active material region is 50mm to 150mm; And / or, the width of the liquid-retaining area is 2mm to 8mm; And / or, the width of the second active material region is 50 mm to 150 mm.

5. The negative electrode sheet according to claim 1, wherein The thickness of the first active material layer is 70 μm to 110 μm; And / or, the first active material layer has an areal density of (0.18-0.2) / 15 40.25 g / mm 2 .

6. The negative electrode sheet according to claim 1, wherein The thickness of the second active material layer is 40 μm to 70 μm; and / or the second active material layer has an areal density of (0.12-0.15) / 15 40.25 g / mm 2 .

7. The negative electrode sheet according to claim 1, wherein The thickness of the third active material layer is 70 μm to 110 μm; and / or the third active material layer has an areal density of (0.18-0.2) / 15 40.25 g / mm 2 .

8. The negative electrode sheet according to claim 1, characterized by The thickness of the fourth active material layer is 40μm to 70μm; And / or, the fourth active material layer has an areal density of (0.12-0.15) / 15 40.25 g / mm 2 .

9. The negative electrode sheet according to claim 1, wherein The negative electrode sheet further includes a second liquid-retaining layer, which is disposed on the surface of the first active material layer, the second active material layer, and the first liquid-retaining layer away from the current collector. And / or, the thickness of the second liquid-retaining layer is 5 μm to 30 μm; And / or, the liquid-retaining material in the first liquid-retaining layer is the same as that in the second liquid-retaining layer.

10. A battery comprising a negative electrode sheet, characterized by, The negative electrode includes the negative electrode as described in any one of claims 1 to 9.