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Positive plate and lithium ion battery containing positive plate

A technology of positive electrode sheet and positive current collector, applied in the field of lithium battery, can solve the problems of becoming, unable to advance, and restricting the development of battery cells

Active Publication Date: 2020-11-06
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the safety of battery cells has become a challenge and opportunity for subsequent development. Only by taking into account both safety and electrical performance can we gain a foothold and develop in the lithium-ion battery industry, otherwise the lithium-ion battery will become an untimely "bomb" in our hands and cannot move forward. , hold back
[0003] The current methods to improve the safety of lithium-ion batteries are all at the expense of the electrical performance of lithium-ion batteries, which greatly restricts the development of batteries

Method used

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  • Positive plate and lithium ion battery containing positive plate
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  • Positive plate and lithium ion battery containing positive plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Lithium cobaltate (particle size D) 50 = 3.8-4.2 μ m): polyvinylidene fluoride (molecular weight between 1 million and 1.1 million, recorded as 1 million): carbon black (specific surface area of 65m 2 / g) mixed according to the mass ratio of 88.5: 10: 1.5, dissolved in NMP, stirred evenly with a ball mill at a high speed, coated on an aluminum foil with a thickness of 10μm by a coater, and dried to remove NMP. Figure 1 Medium safety coating 2, aluminum foil 3, and positive plate of safety coating 2. The thickness of the single-layer safety coating is about 15 μ m..

[0063] Lithium cobaltate (particle size D) 50 = 15-16 μ m): polyvinylidene fluoride (molecular weight between 800,000 and 900,000, recorded as 800,000): carbon black (specific surface area of 150m 2 / g) mixing according to the mass ratio of 97.8: 1.1: 1.1, dissolving in NMP, uniformly stirring with a ball mill at a high speed, coating it on a safety coating with a coater, and drying to remove NMP, so as to obta...

Embodiment 2

[0066] The difference is that lithium cobaltate: polyvinylidene fluoride: carbon black in the safety coating is mixed according to the mass ratio of 88: 10: 2.

Embodiment 3

[0068] The difference is that lithium cobaltate: polyvinylidene fluoride: carbon black in the safety coating is mixed according to the mass ratio of 87.5: 10: 2.5.

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Abstract

The invention provides a positive plate and a lithium ion battery containing the positive plate. The safety of the battery cell is improved by controlling the seepage thresholds of the safety coatingcoating the surface of the positive current collector and the positive active material layer, and meanwhile, relatively high energy density and excellent electrical properties are ensured. Particularly, the seepage threshold value of the positive active material layer is small, and the addition amount of the conductive agent is small, so that a good electron path can be ensured, and the energy density of the positive plate can be increased.

Description

Technical field [0001] The invention belongs to the technical field of lithium batteries, and particularly relates to a positive plate and a lithium ion battery containing the positive plate. technical background [0002] As a new energy product, lithium-ion battery is widely used in household appliances, mobile phones, wearable devices and so on. With the wider application range, our daily life has been closely linked with lithium-ion batteries. With the rapid development of lithium-ion battery industry, lithium-ion batteries have made great achievements in capacity, fast charging, cycle life and other performances, and are under continuous research and development. The higher and higher cell capacity and faster charging time mean that the batteries have more energy, and once the internal / external short circuit occurs, the greater harm will be caused. Therefore, the safety of battery cells has become a challenge and opportunity for subsequent development. Only by taking into acc...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M10/42
CPCH01M4/623H01M4/624H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 徐昕彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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