Pole piece with uniform thickness of tab ceramic coating and preparation method thereof

A technology of ceramic coating with uniform thickness, which is applied in electrode current collector coating, electrode manufacturing, battery electrodes, etc. It can solve the problems of short circuit, easy short circuit in the tab area, lithium precipitation, etc., and achieve simple preparation process and reduce short circuit The effect of lithium precipitation phenomenon, high quality and high yield

Active Publication Date: 2021-03-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of easy short circuit and lithium precipitation in the tab area in the prior art, and provide a pole piece with a uniform thickness of the tab ceramic coating and its preparation method. The invention can effectively solve the problem by using the tab ceramic coating method. The internal short circuit of the battery, while coating the tabs with a ceramic layer, can ensure that the thickness of the tabs is consistent with the thickness of the middle area, which can effectively avoid lithium deposition in the battery and improve the safety of the battery. The preparation process is simple and the yield of high-quality products is high.

Method used

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  • Pole piece with uniform thickness of tab ceramic coating and preparation method thereof
  • Pole piece with uniform thickness of tab ceramic coating and preparation method thereof
  • Pole piece with uniform thickness of tab ceramic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for preparing a pole piece with a uniform thickness of the lug ceramic coating, comprising the following preparation steps:

[0040] (1) Coating the active material: apply the active material slurry at a rate of 19.5 mg / cm on one side 2 The coating amount is evenly coated on the surface of the foil; the thickness of the foil is 6 μm, and the active material coating is nickel cobalt lithium manganate or graphite coating.

[0041] (2) Coating ceramic coating: while coating the active material, the prepared ceramic slurry coating is coated on the connection area, and the ceramic coating covers the 5mm tab and the 10mm middle area respectively; the middle area ceramic coating and The connection area of ​​the active material coating is a slope connection, and the maximum thickness of the ceramic coating on the slope connection is 1 / 4 of the thickness of the pole piece.

[0042]The preparation steps of the ceramic slurry include: 1) Preparation of ceramic powder sol...

Embodiment 2

[0047] The difference from Example 1 is that a method for preparing a pole piece with a uniform thickness of the lug ceramic coating includes the following preparation steps:

[0048] (1) Coating the active material: apply the active material slurry at a rate of 19.8 mg / cm on one side 2 The coating amount is evenly coated on the surface of the foil; the thickness of the foil is 10 μm, and the active material coating is nickel cobalt lithium manganate or graphite coating.

[0049] (2) Coating ceramic coating: While coating the active material, coat the prepared ceramic slurry coating on the connection area, and the ceramic coating covers the 5mm tab and the 10.5mm middle area respectively; the middle area ceramic coating The connection area with the active material coating is a slope connection, and the maximum thickness of the ceramic coating on the slope connection is 3 / 10 of the thickness of the pole piece.

[0050] The ceramic slurry preparation steps include: 1) ceramic p...

Embodiment 3

[0055] The difference from Example 1 is that a method for preparing a pole piece with a uniform thickness of the lug ceramic coating includes the following preparation steps:

[0056] (1) Coating the active material: apply the active material slurry to 20mg / cm on one side 2 The coating amount is evenly coated on the surface of the foil; the thickness of the foil is 12 μm, and the active material coating is nickel cobalt lithium manganate or graphite coating.

[0057] (2) Coating ceramic coating: While coating the active material, coat the prepared ceramic slurry coating on the connection area, and the ceramic coating covers the 5mm tab and the 11mm middle area respectively; the middle area (2.2) ceramic The connection area between the coating (4) and the active material coating (3) is an inclined connection, and the maximum thickness of the ceramic coating on the inclined connection is 7 / 20 of the thickness of the pole piece.

[0058] The ceramic slurry preparation steps incl...

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Abstract

The invention relates to the technical field of lithium batteries, and discloses a pole piece with uniform thickness of a tab ceramic coating and a preparation method thereof, aiming at the problems of easy short circuit and lithium precipitation in a tab area in the prior art, the pole piece (1) comprises a foil material (2), the foil material comprises a tab (2.1) and a middle area (2.2), and two sides of the middle area are coated with active substance coatings (3). The connection area of the middle area (2.2) and the tab (2.1) is coated with a ceramic coating (4), and the surface formed bythe ceramic coating (4) and the active substance coatings (3) is parallel to the foil (2). Through adoption of the tab ceramic coating method, the problem of internal short circuit of the battery canbe effectively solved, meanwhile, the tab is coated with the ceramic layer, it can be guaranteed that the thickness of the tab of the pole piece is consistent with that of the middle area, lithium precipitation of the battery can be effectively avoided, the safety of the battery is improved, the preparation process is simple, and the high-quality rate of finished products is high.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a pole piece with a uniform thickness of a tab ceramic coating and a preparation method thereof. Background technique [0002] In recent years, the application of lithium-ion power batteries has become more and more widespread, but safety issues have also been exposed more and more. At the same time, the problem of inconsistent battery surface thickness is also difficult to solve. First of all, most battery safety problems focus on the internal short circuit of the battery, which is mainly manifested in the direct contact of the positive and negative electrodes inside the battery and the short circuit occurs. Therefore, a safe and reliable method is urgently needed to solve the safety problem of lithium-ion power batteries. Secondly, the inconsistent surface thickness of the battery leads to inconsistent pressure received by the battery inside the module. The thicker p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04
CPCH01M4/13H01M4/139H01M4/0404Y02E60/10
Inventor 谭歌韩笑李凡群夏赛赛谢天万华丰
Owner WANXIANG 123 CO LTD
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