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Negative electrode sheet, battery cell and lithium ion battery

A negative electrode sheet and negative electrode technology, applied in the field of energy storage devices, to achieve the effects of improving utilization, preventing the reduction of interlayer bonding force, and improving capacity performance

Active Publication Date: 2021-08-17
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the existing lithium-ion batteries are difficult to balance high capacity and high safety performance at the same time, so they cannot meet people's increasingly higher requirements for battery performance

Method used

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  • Negative electrode sheet, battery cell and lithium ion battery
  • Negative electrode sheet, battery cell and lithium ion battery
  • Negative electrode sheet, battery cell and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0078] Next, a method for preparing the negative electrode sheet 10 is provided, the method includes the following steps:

[0079] S100 , disposing the negative electrode active material layer 12 on at least one surface of the negative electrode current collector 11 .

[0080] S200 , depositing an inorganic dielectric material on the first surface 121 of the negative electrode active material layer 12 to obtain the inorganic dielectric layer 13 having the aforementioned channels 132 .

[0081] S300 , disposing the lithium metal layer 14 on the surface of the inorganic dielectric layer 13 facing away from the negative electrode active material layer 12 to obtain the negative electrode sheet 10 .

[0082] In some embodiments, in step S100, the negative electrode active material, binder and conductive agent are dispersed in a solvent, and the solvent can be deionized water or N-methylpyrrolidone (NMP) to form a uniform negative electrode slurry; The negative electrode slurry is ...

Embodiment 1

[0148] Preparation of positive electrode sheet

[0149] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.8 co 0.1 mn 0.1 o 2 ), the conductive agent acetylene black, and the binder PVDF are dispersed in the solvent NMP according to the weight ratio of 94:4:2, and the positive electrode slurry is obtained by fully stirring and mixing; the positive electrode slurry is coated on the two opposite surfaces of the positive electrode current collector aluminum foil , wherein the coating weight of the positive electrode slurry is 0.250 g / 1540.25mm 2 ; After drying and cold pressing, the positive electrode sheet is obtained. The reversible gram capacity of lithium nickel cobalt manganese oxide is 197 mAh / g.

[0150] Preparation of negative electrode sheet

[0151] The negative electrode active material silicon-carbon composite material (containing silicon oxide SiO x , x=1.5; the mass proportion of silicon element in the silicon-carbon com...

Embodiment 2

[0167] The difference from Example 1 is that the coating weight of the negative electrode slurry is 0.104g / 1540.25mm 2 , the weight of the lithium metal layer is 2.7mg / 1540.25mm 2 The size of the extension of the inorganic dielectric layer in the thickness direction of the negative electrode active material layer is 1 / 80 of the thickness of the main body; in the negative electrode sheet per unit area, the weight of the Al element in the inorganic dielectric layer accounts for 0.19%.

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Abstract

The invention discloses a negative electrode sheet, a battery cell and a lithium ion battery. The negative electrode sheet includes a negative electrode current collector; a negative electrode active material layer is arranged on the negative electrode current collector, and the negative electrode active material in the negative electrode active material layer contains a silicon-based material; An inorganic dielectric layer without a binder is arranged on the side of the negative electrode active material layer away from the negative electrode current collector, the inorganic dielectric layer includes an inorganic dielectric material, and the inorganic dielectric layer at least includes The main body has a passage arranged through the main body along its thickness direction; the lithium metal layer is arranged on the surface of the inorganic dielectric layer away from the negative electrode active material layer. By adopting the negative pole piece provided by the invention, the lithium ion battery can simultaneously take into account higher capacity performance, safety performance and cycle life.

Description

technical field [0001] The invention belongs to the technical field of energy storage devices, and in particular relates to a negative pole piece, a battery cell and a lithium ion battery. Background technique [0002] As a secondary battery, lithium-ion batteries mainly rely on the back-and-forth migration of lithium ions between the positive active material and the negative active material for charging and discharging, and electrolytes are usually used as the carrier for lithium ion transmission. During use, lithium-ion batteries can provide stable voltage and current, and the use process is environmentally friendly, and are widely used in various electronic products and electric vehicles, occupying the mainstream position in the battery field. [0003] However, existing lithium-ion batteries are difficult to balance high capacity and high safety performance at the same time, so they cannot meet people's increasingly higher requirements for battery performance. Contents ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/134H01M4/386H01M4/382H01M4/628H01M10/0525H01M2004/027H01M2220/20H01M4/366H01M2200/00H01M4/62Y02E60/10H01M4/1395H01M4/0404H01M4/483H01M10/0562H01M2004/021H01M4/0447
Inventor 盛长亮王铈汶黄起森李铖梁成都
Owner CONTEMPORARY AMPEREX TECH CO