Negative plate, preparation method thereof and diaphragm-free battery cell

A negative electrode sheet, no diaphragm technology, applied in the direction of negative electrode, electrode manufacturing, electrode collector coating, etc., can solve the problems of poor bonding strength, affecting the air permeability of the negative electrode, etc., achieve good bonding, increase energy density, The effect of reducing space

Pending Publication Date: 2021-05-04
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium-ion battery without diaphragm improves the space utilization rate inside the battery cell through the setting of the composite gel cured film, but the setting of the composite gel cured film also affects the air permeability of the negative electrode, and the bonding strength with the negative electrode and the positive electrode bad

Method used

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  • Negative plate, preparation method thereof and diaphragm-free battery cell
  • Negative plate, preparation method thereof and diaphragm-free battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides a figure 1 As shown in the negative electrode sheet, the negative electrode sheet includes a negative electrode sheet current collector 11 and a negative electrode material layer 12 , an insulating ceramic layer 13 and a glue coating layer 14 sequentially arranged on both sides of the negative electrode sheet current collector 11 .

[0058] The thickness of the negative electrode material layer 12 is 120 μm, the thickness of the insulating ceramic layer 13 is 50 μm, and the thickness of the adhesive layer 14 is 15 μm.

[0059] The negative current collector is copper foil.

[0060] The preparation method of described negative plate comprises the following steps:

[0061] (1) Prepare the negative electrode active slurry, apply the negative electrode active slurry on both sides of the negative electrode current collector 11, and dry at 60°C to obtain the first negative electrode sheet;

[0062] The negative electrode active slurry includes: 60wt...

Embodiment 2

[0068] This embodiment provides a figure 1 The negative electrode sheet shown in step (2) is the same as that of Example 1 except that the mass percentage of the insulating ceramic material in the insulating slurry in step (2) is 15 wt%, and the mass percentage of the second binder is 30 wt%.

Embodiment 3

[0070] This embodiment provides a figure 1 The negative electrode sheet shown in step (2) is the same as that of Example 1 except that the mass percentage of the insulating ceramic material in the insulating slurry in step (2) is 5 wt%, and the mass percentage of the second binder is 75 wt%.

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Abstract

The invention relates to a negative plate, a preparation method thereof and a diaphragm-free battery cell. The negative plate comprises a negative plate current collector, and negative material layers, insulating ceramic layers and gluing layers which are sequentially arranged on two sides of the negative plate current collector; the diaphragm-free battery cell comprises a positive plate and a negative plate which are sequentially stacked. The positive plate comprises a positive plate current collector and positive material layers arranged on two sides of the positive plate current collector. The insulating ceramic layers and the gluing layers are arranged on the two sides of the negative plate, so that a conventional diaphragm layer can be omitted, the space of a battery cell is reduced, and the volume energy density is improved; the positive and negative electrode insulation effect can be achieved, the transmission of lithium ions is not influenced, and the good adhesion of the positive and negative electrodes is ensured, so that the battery cell can be safely used.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a pole piece structure, in particular to a negative pole piece, a preparation method thereof, and a separator-free battery cell. Background technique [0002] The trend towards lighter weight and higher performance in portable devices such as smartphones, notebook PCs, tablet PCs, and portable game consoles is driving an increasing demand for secondary batteries that drive power supplies. Lithium secondary batteries with high operating voltage and high energy density per unit weight are most commonly used at present. Lithium secondary batteries have also been used as power sources for electric vehicles, hybrid electric vehicles and storage of renewable energy. [0003] The lithium secondary battery design process mainly involves the installation of an electrode assembly with a positive electrode / diaphragm / negative electrode structure that can be charged and discharged in the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/134H01M4/137H01M4/1391H01M4/1393H01M4/1395H01M4/1399H01M4/04H01M10/058H01M10/052H01M4/02
CPCH01M4/02H01M4/0404H01M4/131H01M4/133H01M4/134H01M4/137H01M4/1391H01M4/1393H01M4/1395H01M4/1399H01M10/052H01M10/058H01M2004/027Y02E60/10Y02P70/50
Inventor 张馨月其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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