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Negative plate, battery and preparation method of negative plate

A negative electrode sheet and negative electrode technology, applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem of insufficient negative electrode margin at the head of the battery cell, reduce the risk of lithium analysis, improve energy density, Effect of good ion diffusion kinetics on performance

Pending Publication Date: 2021-07-09
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a method for preparing a negative electrode sheet, a battery, and a negative electrode sheet, which solves the problem in the prior art that the negative electrode balance at the head of the battery cell is insufficient and lithium is analyzed during the charging process.

Method used

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  • Negative plate, battery and preparation method of negative plate
  • Negative plate, battery and preparation method of negative plate
  • Negative plate, battery and preparation method of negative plate

Examples

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preparation example Construction

[0068] See Figure 6 , Figure 6 It is a flow chart of a method for preparing a negative electrode sheet provided by an embodiment of the present invention. Such as Figure 6 As shown, the preparation method of the negative electrode sheet comprises:

[0069] Step 601, forming a negative electrode current collector, the surface of the negative electrode current collector includes a coating area and an empty foil area, and the empty foil area is used to set the negative electrode tab;

[0070] Step 602, coating the first coating slurry on the coating area to form a first coating, the first coating slurry is formed by mixing the first conductive agent, the first binder and the first active material become;

[0071] Step 603, coating a second coating slurry on the first coating to form a second coating, the second coating slurry is composed of a second conductive agent, a second binder and a second active material mixed;

[0072] Wherein, the distance between the edge of th...

Embodiment and 3

[0079] Introduce below 3 kinds of specific embodiments and 3 kinds of comparative examples in 1 of the embodiment of the present invention:

Embodiment 1

[0081] Step 1. Prepare the first coating slurry with the first active material: according to the ratio of 96.8% of the first active material, 1.2% of the first conductive agent, and 2% of the first binder, it is prepared based on a certain batching process The first coating slurry has a viscosity of 2000-5000mPa.s and a solid content of 40%-50%.

[0082] Step 2. Prepare the second coating slurry with the second active material: according to the ratio of 96.8% of the second active material, 1.2% of the second conductive agent, and 2% of the second binder, it is prepared based on a certain batching process As for the second coating slurry, the viscosity of the second coating slurry is 2000-5000mPa.s, and the solid content is 40%-50%.

[0083] Step 3. After passing the first coating slurry prepared by step 1 above through a screen, coat the coating area with the negative electrode current collector to form a first coating, and then apply the slurry prepared by step 2 After the s...

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Abstract

The invention provides a negative electrode plate, a battery and a preparation method of the negative electrode plate. The negative electrode plate comprises a negative current collector, a negative tab, a first coating and a second coating, wherein the edge of the second coating is closer to the negative tab compared with the edge of the first coating; and the median diameter D50 of an active material contained in the second coating is smaller than the median diameter D50 of an active material contained in the first coating, so the negative paste closer to the negative electrode tab is the active material with a relatively small particle size, better ion diffusion dynamic performance can be presented, and the risk of lithium precipitation in a charging process is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a negative electrode sheet, a battery and a preparation method for the negative electrode sheet. Background technique [0002] With the development of lithium-ion secondary batteries, consumers have higher and higher demands on their charging speed, battery life, and safety performance. Due to the hydrodynamic properties of the negative electrode slurry itself and the characteristics of the manufacturing process, the thickness of the edge part of the paste is smaller than that of the middle part, and because the current density of the negative electrode sheet is relatively high near the negative electrode tab, the negative electrode sheet is prepared into When the battery is charged, it will lead to insufficient negative electrode balance at the head of the battery, and lithium will be deposited during the charging process, which will deteriorate the battery perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 王洛彭冲许岩欧长志李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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