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A lithium-ion battery, a lithium-ion battery separator and a preparation method thereof

A lithium-ion battery and separator technology, applied in the field of separators and separators for lithium-ion batteries, can solve the problems of lack of liquid and flooding of cells, and achieve the effect of improving performance and uniformity

Active Publication Date: 2022-02-15
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the slurry is a mixed slurry of inorganic ceramic powder and one-dimensional nanomaterials, and there is no gradient change in the height direction of the cell, which cannot solve the problem that the electrolyte tends to concentrate at the bottom of the cell under the action of gravity, causing the cell to appear The problem of the state of lack of liquid at the top and rich liquid at the bottom

Method used

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  • A lithium-ion battery, a lithium-ion battery separator and a preparation method thereof
  • A lithium-ion battery, a lithium-ion battery separator and a preparation method thereof
  • A lithium-ion battery, a lithium-ion battery separator and a preparation method thereof

Examples

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Embodiment 1-5

[0038] The preparation method of the isolation film of Example 1-5 in the specific embodiment of the present invention comprises the following steps:

[0039] The coating slurry with different particle diameters is pumped into the slurry tank through the discharge port, and the shape of the discharge port and the distribution of the slurry in embodiments 1-5 are as follows: Figure 1-5 As shown, the slurry with different particle sizes enters the slurry tank through the different wedge shapes of the feed inlet to form a gradient slurry, and the gradient slurry in the slurry tank is transferred to the surface of the isolation membrane using a micro-gravure roller coating method, solidified to obtain the lithium-ion battery separator.

[0040] In the above preparation method, the pumping speed is 2-8g / s, the thickness of the coating is 3±1 μm, and the isolation film is a PE isolation film with a thickness of 9±1 μm.

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Abstract

The invention provides a lithium-ion battery, a lithium-ion battery separator and a preparation method thereof. The separator includes a base film and a coating arranged on the surface of the base film. The raw material of the coating is along the height of the cell The direction increases gradually from top to bottom. The width direction of the separator (corresponding to the height direction of the cell) exhibits different wetting speeds and liquid retention capabilities for the electrolyte, thereby counteracting the tendency of the electrolyte in the cell to gather to the bottom under the action of gravity. The uniformity of electrolyte wetting in the height direction of the cell is improved, thereby improving the performance of the cell over a long life cycle.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a separator, in particular to a separator for lithium-ion batteries. Background technique [0002] Lithium-ion power batteries are widely used in power tools, electric vehicles, etc. due to their high energy density, wide application window, and relatively mature production technology. The PE separator commonly used in lithium-ion power batteries is easy to shrink when heated, and the electrolyte wetting ability and liquid retention ability are not strong; now, a uniform ceramic coating is usually coated on one side of the PE bare film to improve the heat shrinkage of the separator. , liquid retention and other properties; however, under the action of gravity, the electrolyte tends to concentrate at the bottom of the cell, causing the cell to appear in a state where the top is short of liquid and the bottom is rich in liquid. This uneven distribution of electrolyte will lead t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/443H01M50/446H01M50/403H01M10/0525
CPCY02E60/10
Inventor 姜斌陈立余雄
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD