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Alloyed negative electrode, preparation method thereof and lithium ion battery

A lithium-ion battery, alloying technology, applied in the direction of negative electrode, battery electrode, secondary battery, etc., can solve the problems of reducing the safety stability and service life of the battery, increasing the irreversible capacity, pulverizing and breaking the pole piece, etc. Industrial application, improve cycle stability and service life, small volume expansion and deformation effect

Inactive Publication Date: 2020-12-18
SHENZHEN INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide an alloyed negative electrode and its preparation method, as well as a lithium-ion battery, which aims to solve the problem that the existing alloyed negative electrode is prone to volume expansion during charging and discharging, which leads to the powdering and cracking of the electrode sheet. , the irreversible capacity increases, and the Coulombic efficiency decreases, thereby reducing the safety, stability and service life of the battery

Method used

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  • Alloyed negative electrode, preparation method thereof and lithium ion battery
  • Alloyed negative electrode, preparation method thereof and lithium ion battery
  • Alloyed negative electrode, preparation method thereof and lithium ion battery

Examples

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preparation example Construction

[0033] The second aspect of the embodiment of the present application provides a method for preparing an alloyed negative electrode, comprising the following steps:

[0034] Step (1), preparing a first conductive polymer layer on the surface of the first metal foil layer, and setting a second metal foil layer on the surface of the first conductive polymer layer away from the first metal foil layer;

[0035] In step (2), the conductive polymer layer and the metal foil layer are alternately laminated on the surface of the second metal foil layer away from the first conductive polymer layer to obtain an N-layer conductive polymer layer and an N+1 metal foil layer. Alloyed negative electrodes arranged in alternate layers; wherein, N is a positive integer ranging from 1 to 10.

[0036] The preparation method of the alloyed negative electrode provided in the second aspect of the present application uses the metal foil layer as the base material, and sequentially prepares a conductiv...

Embodiment 1

[0058] A composite aluminum foil negative electrode, comprising the following preparation steps:

[0059] Step (1): Prepare polymer slurry: Weigh conductive polymer polyaniline and add DMF solvent to fully mix and stir to form uniform polymer slurry;

[0060] Step (2): Obtain a clean aluminum foil layer with a thickness of 5 μm;

[0061] Step (3): coating: evenly coat the polyaniline slurry on the first surface of the aluminum foil layer by scraping, and form the first conductive polymer layer after the slurry is completely dried;

[0062] Step (4): Composite rolling: set a second clean aluminum foil layer on the surface of the first conductive polymer coating, and then perform rolling to make the polymer coating evenly embedded in the middle of the aluminum foil;

[0063] Step (5): Repeat steps (2) to (4) to obtain a composite aluminum foil structure with 5 layers of conductive polymer intermediate buffer layers, and the average thickness of the intermediate conductive polym...

Embodiment 2～6

[0067] The structures and preparation methods of the composite aluminum foil negative electrodes provided in Examples 2-6 of the present application are the same as those in Example 1, except that the conductive polymer materials are different, as shown in Table 1 below.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to an alloyed negative electrode, which comprises N conductive polymer layers and N + 1 metal foil layers, and the metal foil layers and the conductive polymer layers are alternately laminated; wherein N is a positive integer from 1 to 10. The alloyed negative electrode is of a multi-layer composite structure composed of the plurality of metal foil layers and the conductive polymer layers arranged between the adjacent metal foil layers, the conductive polymer layers have good electronic conductivity, and the lithium embedding depth of the metal foil layers in the negative electrode of the composite structure can be guaranteed; the metal foil layers also has flexibility, cohesiveness and elasticity, can stabilize an alloying negative electrode interface, effectively avoids the problems of material volume expansion, pulverization and the like in the charging and discharging process, and improves the structural stability and safety of the metal foil layers, thereby improving the cycle stability and service life of the battery.

Description

technical field [0001] The application belongs to the technical field of batteries, and in particular relates to an alloyed negative electrode and a preparation method thereof, and a lithium ion battery. Background technique [0002] With the rapid development of markets such as portable electronic devices, electric vehicles, 5G communication energy storage and other large-scale energy storage, people's demand for high energy density and low-cost secondary batteries is becoming increasingly urgent. At present, commercial lithium-ion batteries mostly use graphite-based negative electrode materials, whose theoretical specific capacity is only 372mAh / g, and the compaction density is low, which limits the further improvement of the energy density of lithium-ion batteries. Lithium-ion batteries based on alloyed negative electrodes such as Al, Sn, and Si have the advantage of high specific energy, and have become a research hotspot for high specific energy storage batteries. For ...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/62H01M4/66H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/622H01M4/624H01M4/628H01M4/661H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 严睿婷张帆张业正唐永炳
Owner SHENZHEN INST OF ADVANCED TECH
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