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Lithium battery cell and lithium ion battery

A lithium battery and cell technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as lithium precipitation, lithium precipitation, and lithium precipitation in negative electrode sheets, and improve cycle stability and reliability. Safety, the ability to inhibit lithium evolution, the effect of improving the ability of lithium evolution

Active Publication Date: 2021-05-04
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after a certain number of battery charge and discharge cycles, lithium deposition is prone to occur in the area adjacent to the tab of the negative electrode sheet. The larger the charging current, the more serious the lithium deposition.
The lithium precipitated from the negative electrode forms dendrites, which can easily pierce the separator and cause the battery to short-circuit, causing the battery to smoke, catch fire or even explode.
[0004] In the existing lithium-ion battery manufacturing technology, the slurry of the same formula is used for the entire coating of the pole piece, and the type, content, and coating thickness of the active material in each area along the length direction of the pole piece are kept consistent, which may easily lead to the occurrence of analyte in the area adjacent to the tab of the negative pole piece. lithium phenomenon

Method used

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  • Lithium battery cell and lithium ion battery
  • Lithium battery cell and lithium ion battery
  • Lithium battery cell and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054]The negative electrode sheet is prepared: the slurry forming the first negative electrode active material layer is formed, and the slurry of the second negative active material layer is formed and the slurry forming the third negative active material layer; wherein the slurry of the first negative active material layer The composition was: 97 wt% graphite, 1 wt% of the conductive carbon black, 2 wt% butadiene latex, the solid content of 40% to 45 wt%; the slurry group of the second negative active material layer became: 97% by weight graphite, 1 wt % Of the conductive carbon black, 2 wt% butadiene latex, its solid content is 40% by weight to 45 wt%; the slurry group of the third negative active material layer is: 97% by weight of graphite, 1 wt% conductive carbon black, 2 wt% Butyl chlorpyrene latex, the solid content is 40% by weight to 45 wt%. D50 particle diameter (R103) of the first negative active material in the slurry of the first negative active material layer, lithium...

Embodiment 2-6 and comparative example 1-5

[0060]Example 2-6 and Comparative Example 1-5 are the same as that of the first embodiment, which differs from the first negative active substance in the slurry of the first negative active material layer (R103), Switching current density of lithium in a negative electrode active substance (i0103), the solid phase diffusion coefficient (D103) of lithium forms a D50 particle diameter (R104) of the second negative active material in the slurry of the second negative active material layer, the exchange current density of lithium in the second negative active substance ( i0104), the solid phase diffusion coefficient (D104) of lithium forms the D50 particle diameter (R105) of the third negative active material in the slurry of the third negative electrode active material layer, the exchange current density of lithium in the third negative active material ( i0105), the solid phase diffusion coefficient of lithium (D105), the negative electrode bilateral coating region length (L1034), the ...

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Abstract

The invention relates to a lithium battery cell, which comprises a positive plate and a negative plate, the negative (positive) plate comprises a current collector and a negative (positive) functional layer coated on at least one surface of the current collector, and a negative (positive) tab is arranged on the first (third) surface of the negative (positive) current collector. A functional layer of the first surface (fourth surface opposite to the third surface) comprises a double-layer coating area close to the negative electrode (positive electrode) tab, and the double-layer coating area comprises a first negative electrode (positive electrode) active material layer and a second negative electrode (positive electrode) active material layer; the first negative electrode (positive electrode) active material layer is located between the surface of the negative electrode (positive electrode) current collector and the second negative electrode (positive electrode) active material layer, and the particle size of a first negative electrode (positive electrode) active material in the first negative electrode (positive electrode) active material layer is larger than (smaller than) the particle size of a second negative electrode active material in the second negative electrode (positive electrode) active material layer. When the battery cell is applied to the lithium battery, the lithium precipitation phenomenon of the negative electrode of the lithium battery can be well inhibited.

Description

Technical field[0001]The present invention relates to the field of lithium batteries, and more particularly to a lithium battery cell and a lithium ion battery.Background technique[0002]Lithium-ion batteries have the advantages of high operating voltage, high energy density, long cycle life, and is widely used in 3C digital products, electric vehicles and military space. With the popularity and application of intelligent digital products, the wide application of new energy vehicles, the demand for shortening the charging time of lithium ion battery and the energy density of lithium ion battery becomes more urgent, and correspondingly, the charging speed and voltage of the lithium ion battery are proposed. Higher requirements.[0003]At present, the battery used in digital products uses winding structures, and often requires simultaneous requirements for high energy density and fast charging speed. However, after a certain number of times the battery charge is changed, the negative ele...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M10/0525H01M10/0587H01M10/42H01M50/531
CPCH01M4/13H01M10/0525H01M10/0587H01M4/628H01M10/4235Y02P70/50
Inventor 楚豫寒王烽李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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