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Negative plate, preparation method thereof and lithium battery

A negative electrode, lithium battery technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve battery safety hazards, battery capacity, uneven lithium metal deposition, serious lithium dendrites and other problems, and achieve good results. Cycling performance, inhibition of lithium dendrite generation, and effect of increasing specific surface area

Inactive Publication Date: 2017-12-15
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using only a current collector without using any negative active material will lead to uneven deposition of lithium metal during charging and severe lithium dendrites, making the battery a safety hazard and seriously attenuating the battery capacity.

Method used

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  • Negative plate, preparation method thereof and lithium battery
  • Negative plate, preparation method thereof and lithium battery
  • Negative plate, preparation method thereof and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The PVDF binder dry powder is dissolved in nitrogen methylpyrrolidone (NMP) to form a concentration of 0.1 to 10% PVDF glue, then add graphene to the resulting PVDF glue, stir at a high speed to obtain a uniform graphene slurry, and then Gained slurry covers a 0.5 μm thick graphene layer 2 ( figure 1 ), and dry to remove the solvent to obtain a lithium-free negative electrode sheet.

[0048] The positive electrode sheet is prepared by a conventional method. The positive electrode active material on the positive electrode sheet is lithium iron phosphate. The negative electrode sheet, the lithium iron phosphate positive electrode sheet, and the diaphragm are laminated using a lamination process, and a liquid electrolyte is used to form a lithium battery.

Embodiment 2

[0052] Dissolve PVDF binder dry powder in nitrogen methyl pyrrolidone (NMP) to form a PVDF glue with a concentration of 0.1-10%, then add conductive carbon black to the obtained PVDF glue, and stir at a high speed to obtain a uniform carbon black slurry. Then the obtained slurry is covered with a 5 μm thick conductive carbon black layer 2 ( figure 2 ), and dry to remove the solvent to obtain a lithium-free negative electrode sheet.

[0053] The positive electrode sheet was prepared by a conventional method. The active material of the positive electrode in this example was lithium cobalt oxide. The negative electrode sheet, lithium cobalt oxide positive electrode sheet, and separator were wound together with a gel electrolyte to make a lithium battery.

Embodiment 3

[0057] Dissolve commercially available acrylic adhesive dry powder in deionized water to form an acrylic adhesive with a concentration of 0.1 to 10%, then add carbon nanotubes to the acrylic adhesive, and stir at high speed to obtain uniform carbon nanotubes. tube slurry, and then the resulting slurry is covered with a 10 μm thick carbon nanotube layer 2 ( figure 2 ), and the lithium-free negative electrode sheet can be obtained after drying to remove the solvent.

[0058] The positive electrode sheet is prepared by a conventional method. The positive electrode active material in this example is a ternary material, and the negative electrode sheet, the ternary positive electrode sheet, and the diaphragm are laminated using a solid electrolyte to form a lithium battery.

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Abstract

The invention provides a negative plate, a preparation method thereof and a lithium battery. The negative plate comprises a current collector, wherein the current collector is copper with a hole structure, and a protective layer is arranged on the surface of the current collector. Copper with the hole structure is taken as the current collector of the negative plate, so that inside space of the current collector can serve as lithium storage space for storing lithium precipitated in a battery charging process, meanwhile, lithium metal precipitates between the copper current collector and the protective layer by means of the inorganic protective film on the surface of the current collector, and production of lithium dendrites is inhibited. Compared with a common lithium ion battery with a graphite cathode, a lithium secondary battery provided with the lithium-free negative plate has the advantage that the energy density of the lithium battery can be improved substantially under the precondition that higher safety performance and better cycle performance are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium battery negative electrode sheet and a preparation method thereof, and a lithium battery using the negative electrode sheet. Background technique [0002] Lithium-ion battery is a rechargeable battery composed of positive electrode, negative electrode, separator and electrolyte or electrolyte. It is widely used in mobile communication equipment, notebook computers, digital Electronic products such as cameras, and gradually play a role in the field of electric vehicles and energy storage. At present, graphite is mostly used as the negative electrode material of lithium-ion batteries. Due to the limited theoretical specific capacity of graphite, as the market demands higher and higher energy density of batteries, it is urgent to develop a negative electrode sheet that can increase the energy density of lithium secondary batteries. [0003] Posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/661H01M4/667H01M4/80H01M4/808H01M10/0525Y02E60/10
Inventor 赵伟李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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