Negative plate, preparation method thereof and battery

A technology of negative electrode sheet and negative electrode, which is applied in the field of negative electrode sheet and its preparation, can solve problems affecting the electrochemical performance of batteries, and achieve the effects of accelerating transmission speed, increasing liquid retention, and improving power performance

Pending Publication Date: 2022-06-03
ZHUHAI COSMX POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the lithium supplement material residues and holes will affect the electrochemical performance of the battery while supplementing lithium in the pre-lithiation method of the prior art

Method used

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

Examples

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preparation example Construction

[0044] figure 2 It is a process flow diagram of preparing a negative electrode sheet in the embodiment of the present invention, combined with figure 2 As shown, the preparation method of the negative electrode sheet comprises the following steps:

[0045] Step S1, providing a negative electrode current collector 1, coating a negative electrode active material slurry on the surface of the negative electrode current collector 1, and forming a negative electrode active material layer 2 after curing;

[0046] Step S2, setting a hole structure 3 on the surface of the negative electrode active material layer 2;

[0047] Step S3, filling the hole structure 3 with metallic lithium to obtain a negative electrode sheet.

[0048] In the preparation method of the negative electrode sheet provided in the embodiments of the present application, a pore structure is arranged in the negative electrode active material layer, and metal lithium is embedded in the inside of the pore structure...

Embodiment 1

[0061] This embodiment provides a lithium-ion battery, including:

[0062] Preparation of negative electrode sheet: the negative electrode active material graphite Gr+20% SiO, binder PVDF and conductive carbon black are mixed, and a uniformly dispersed solid component is obtained by high-speed stirring, wherein the mass percentage of graphite Gr+20% SiO is 95wt% , the mass percentage of the binder PVDF is 2 wt %, and the mass percentage of the conductive carbon black is 3 wt %; the solid component and water are mixed uniformly to prepare the negative electrode active slurry, and the solid content of the negative electrode active slurry is 60 wt %. Provide copper foil as the negative electrode current collector, apply the negative electrode active slurry evenly on both sides of the copper foil, and the thickness of the negative electrode active material layer on one side surface of the negative electrode current collector is 100 μm, after drying, the negative electrode active ma...

Embodiment 2

[0067] This embodiment provides a lithium ion battery, and the preparation process of the lithium ion battery is the same as that of the embodiment 1, except that:

[0068] When preparing the negative electrode sheet, the surface of the negative electrode active material layer is punched by machining to form multiple pore structures, the pore density of the negative electrode active material layer is 30%, the diameter of each pore structure is 500 μm, and the depth Both are 30 μm. The square flexible packaging battery assembled in this example is denoted as C2.

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Abstract

The invention provides a negative electrode plate and a preparation method thereof and a battery, the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer arranged on at least one side surface of the negative electrode current collector, the negative electrode active material layer is provided with a pore structure, and metal lithium is embedded in the pore structure. The pore structure is arranged in the negative electrode active material layer, and the metal lithium is embedded in the pore structure, so that the electrochemical performance of the battery cell is not influenced while lithium is supplemented, and the risk of short circuit of the battery cell caused by lithium separation penetrating through the diaphragm in the battery cell circulation process is avoided as the metal lithium is embedded in the pore structure; and the safety of the battery cell in the circulation process is effectively improved.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular, to a negative electrode sheet, a preparation method thereof, and a battery. Background technique [0002] Lithium-ion batteries have received extensive attention due to their high energy density and good cycle performance. With the popularization of mobile Internet devices, the promotion of electric vehicles and other electric vehicles, and the development of aerospace technologies such as drones and space probes, the performance of lithium-ion batteries is facing higher development requirements. How to improve lithium-ion battery performance? The energy density and fast charging performance of batteries have become the key breakthrough directions for high-performance lithium-ion batteries. [0003] At present, high-gram capacity silicon-based anode materials are usually used to improve the energy density of batteries. However, due to the low first-time effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/0525H01M4/13H01M4/139H01M4/04H01M4/62
CPCH01M10/4235H01M4/13H01M4/139H01M10/0525H01M4/0416H01M4/0404H01M4/62H01M2004/027Y02P70/50
Inventor 田义军靳玲玲王美丽路永斌来承鹏罗鹏
Owner ZHUHAI COSMX POWER CO LTD
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