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Lithium battery negative plate, wound battery cell and lithium ion battery

A negative electrode and lithium battery technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., and can solve problems such as potential safety hazards, battery short circuits, and lithium separation on negative electrodes

Active Publication Date: 2021-04-30
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 negative plate, wound battery cell and lithium ion battery
  • Lithium battery negative plate, wound battery cell and lithium ion battery
  • Lithium battery negative plate, wound battery cell and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare the negative electrode sheet: respectively prepare the slurry forming the first negative electrode active material layer, the slurry forming the second negative electrode active material layer and the slurry forming the third negative electrode active material layer; wherein, the slurry of the first negative electrode active material layer The composition is: 97wt% of graphite, 1wt% of conductive carbon black, 2wt% of styrene-butadiene latex, and its solid content is 40wt%-45wt%; the slurry composition of the second negative electrode active material layer is: 97wt% of graphite, 1wt% % conductive carbon black, 2wt% styrene-butadiene latex, and its solid content is 40wt%-45wt%; the slurry of the third negative electrode active material layer consists of: 97wt% graphite, 1wt% conductive carbon black, 2wt% The styrene-butadiene latex has a solid content of 40wt%-45wt%. Form the exchange current density of lithium in the first negative electrode active material in t...

Embodiment 2-7 and comparative example 1-5

[0050] Embodiment 2-7 and comparative example 1-5 are identical with embodiment 1 preparation steps, form the exchange current density (i 0 103), forming the exchange current density of lithium in the second negative electrode active material in the slurry of the second negative electrode active material layer (i 0 104) and the exchange current density (i 0 105) as shown in Table 1.

[0051] Double layer coating area length (L1034), the length (L105) of the 3rd negative electrode active material layer, the first negative electrode active material layer thickness (T103), the 2nd negative electrode active material layer thickness (T104) and the 3rd negative electrode active material layer The thickness (T105) is shown in Table 1.

[0052] Table 1

[0053]

[0054]

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Abstract

The invention relates to a lithium battery negative plate, a wound battery cell and a lithium ion battery. The negative plate comprises a negative current collector and a functional layer coated on at least one surface of the negative current collector, a negative tab is arranged on a first surface of the negative current collector, and the functional layer on the first surface comprises a double-layer coating area close to the negative tab; the double-layer coating area comprises a first negative electrode active material layer and a second negative electrode active material layer, and the first negative electrode active material layer is located between the surface of the negative electrode current collector and the second negative electrode active material layer; and the exchange current density of lithium in the second negative electrode active material in the second negative electrode active material layer is greater than that of lithium in the first negative electrode active material in the first negative electrode active material layer. When the negative plate 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 invention relates to the field of lithium batteries, in particular to a lithium battery negative electrode sheet, a winding battery cell and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life and environmental friendliness, and are widely used in 3C digital products, electric vehicles, military aerospace and other fields. With the popularization and application of intelligent digital products and the wide application of new energy vehicles, the demand for shortening the charging time of lithium-ion batteries and improving the energy density of lithium-ion batteries has become more urgent, and accordingly the charging speed and voltage of lithium-ion batteries have been raised. higher requirements. [0003] At present, most of the batteries used in digital products adopt a winding structure, and often need to meet the requirements of high energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M50/531H01M4/62H01M10/0525H01M10/0587H01M10/42
CPCH01M4/628H01M4/13H01M10/0525H01M10/0587H01M10/4235Y02E60/10Y02P70/50
Inventor 楚豫寒王烽李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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