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A kind of negative plate and its application

A negative electrode and positive electrode technology, applied in the negative electrode and its application fields, can solve the problems of lithium-ion battery safety hazards, excess in the positive electrode, diaphragm piercing, etc., to reduce the amount of lithium intercalation, slowly decompose lithium, and reduce porosity Effect

Active Publication Date: 2022-03-15
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the development of fast charging technology has brought new problems to lithium-ion batteries. For example, the negative electrode sheet is divided into an overhang area (that is, the area where the negative electrode sheet and the positive electrode sheet do not overlap) and a non-overhang area (that is, the area where the negative electrode sheet and the positive electrode sheet overlap). area), after many fast charging cycles, lithium precipitation will occur in the overhang area, and the continuous accumulation of precipitated lithium will cause the separator to be pierced, which brings serious safety hazards to the lithium-ion battery; although the lithium precipitation phenomenon is Since the negative electrode sheet includes an overhang area, if the negative electrode sheet does not have an overhang area, the problem of lithium deposition on the negative electrode sheet can be solved. However, for the safety considerations of lithium-ion batteries, the cell design must ensure that the negative electrode exceeds the positive electrode, that is, the overhang area must be indispensable

Method used

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  • A kind of negative plate and its application
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  • A kind of negative plate and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation method of negative plate provided by the invention comprises the following steps:

[0051] Step 1, the fast filling type graphite (particle size D of 97 mass parts) 10 6.02μm, D 50 11.7 μm, D 90 22.5 μm), 1 mass part of conductive carbon black, 1 mass part of sodium carboxymethyl cellulose, 1 mass part of styrene-butadiene latex, dissolved in solvent deionized water, mixed uniformly to obtain negative active layer slurry, the negative active layer The viscosity of the layer slurry is 3700mPa.s, and the solid content is 45%;

[0052] Step 2. Apply the above-mentioned negative electrode active layer slurry on the surface of the negative electrode current collector copper foil, and apply the negative electrode active layer slurry according to the non-overhang area of ​​the electrode plate design, and the coating amount is 8mg / cm 2 , the coating amount of the negative electrode active layer slurry in the overhang area is 9.2mg / cm 2 , and the coating widt...

Embodiment 2

[0057] The preparation method of negative plate provided by the invention comprises the following steps:

[0058] Step 1, the artificial graphite of 96.8 mass parts (particle diameter D 10 5.5 μm, D 50 9.8 μm, D 90 18.9 μm), 1.2 parts by mass of conductive carbon black, 1 part by mass of sodium carboxymethyl cellulose, and 1 part by mass of styrene-butadiene latex, dissolved in solvent deionized water, mixed uniformly to obtain negative active layer slurry, the negative active layer The viscosity of the layer slurry is 3550mPa.s, and the solid content is 42.4%;

[0059] Step 2. Apply the above-mentioned negative electrode active layer slurry on the surface of the negative electrode current collector copper foil, and apply the negative electrode active layer slurry according to the non-overhang area of ​​the electrode plate design, and the coating amount is 7.7mg / cm 2 , the coating amount of the negative electrode active layer slurry in the overhang area is 8.3mg / cm 2 , and...

Embodiment 3

[0064] The preparation method of negative plate provided by the invention comprises the following steps:

[0065] Step 1, the artificial graphite of 96.8 mass parts (particle diameter D 10 6.02μm, D 50 11.7 μm, D 90 22.5 μm), 1.2 parts by mass of conductive carbon black, 1 part by mass of sodium carboxymethyl cellulose, and 1 part by mass of styrene-butadiene latex, dissolved in solvent deionized water, mixed uniformly to obtain the negative active layer slurry, the negative active layer The viscosity of the layer slurry is 3620mPa.s, and the solid content is 43%;

[0066] Step 2. Apply the above-mentioned negative electrode active layer slurry on the surface of the negative electrode current collector copper foil, and apply the negative electrode active layer slurry according to the non-overhang area of ​​the electrode plate design, and the coating amount is 8.2mg / cm 2 , the coating amount of the negative electrode active layer slurry in the overhang area is 8.9mg / cm 2 , ...

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Abstract

The invention provides a negative electrode sheet and an application thereof. The first aspect of the present invention provides a negative electrode sheet, the negative electrode sheet includes a current collector and an active layer disposed on the surface of the current collector, wherein the negative electrode sheet is divided into an overhang area and a non-overhang area, and the overhang The areal density of the active layer in the regions is higher than the areal density of the non-overhang regions. The negative electrode sheet provided by the present invention reduces the diffusion speed of lithium ions from the non-overhang region to the overhang region, reduces the amount of lithium intercalation in the overhang region, alleviates the problem of lithium analysis in the overhang region, and prolongs the cycle times and use of lithium-ion batteries life.

Description

technical field [0001] The invention relates to a negative electrode sheet and its application, and relates to the technical field of lithium ion batteries. Background technique [0002] With the continuous intelligence, diversification and lightweight of portable electronic devices, higher requirements are placed on lithium-ion batteries for energy storage components. In order to replenish as much power as possible in a short period of time, fast charging technology has become a research hotspot in recent years, and the development of fast charging technology has also brought unprecedented experience to consumers. [0003] However, the development of fast charging technology has brought new problems to lithium-ion batteries. For example, the negative electrode sheet is divided into an overhang area (that is, the area where the negative electrode sheet and the positive electrode sheet do not overlap) and a non-overhang area (that is, the area where the negative electrode she...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/62H01M4/583
CPCH01M4/133H01M4/62H01M4/583H01M2004/027H01M2004/021Y02E60/10
Inventor 王洛彭冲许岩欧长志李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD