Method for producing lithium ion battery silicon cathode through combination of laser cladding, diffusion welding and dealloying

A lithium-ion battery, laser cladding technology, applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effect of improving uniformity, uniform composition, and fine structure

Active Publication Date: 2016-07-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the micro-nano silicon structure prepared by the above method is still mechanically combined with the current collector, and the damage to the electrode structure due to the volume change of silicon cannot be avoided.

Method used

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  • Method for producing lithium ion battery silicon cathode through combination of laser cladding, diffusion welding and dealloying
  • Method for producing lithium ion battery silicon cathode through combination of laser cladding, diffusion welding and dealloying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Raw materials:

[0023] (1) Aluminum silicon powder (-325 mesh, 99%), Al:Si=95:5wt.%.

[0024] (2) Aluminum plate, purity: 99.0%, size: 100mm×50mm×5mm.

[0025] (3) Etching solution: 3mol / L HCL solution.

[0026] 2. Preparation method

[0027] 1. Preparation of Al-Si Alloy Precursor:

[0028] Put the aluminum-silicon powder on the base material aluminum plate (100mm×50mm×5mm), the preset thickness is about 1.5mm, use IPG fiber laser for cladding, laser power: 4.5kW, spot diameter: 5mm, scanning speed: 2mm / s, protective gas: argon, protective gas flow rate: 15L / min, and then use wire cutting to separate the cladding layer from the substrate to obtain the precursor alloy material.

[0029] 2. Diffusion welding:

[0030] The aluminum-silicon alloy precursor is closely attached to the copper current collector, the aluminum-silicon cladding layer is closely attached to the copper current collector, placed in a vacuum atmosphere and heated for 1 hour, and the tempera...

Embodiment 2

[0034] 1. Raw materials:

[0035] (1) Aluminum silicon powder (-325 mesh, 99%), Al:Si=88:12wt.%.

[0036] (2) Aluminum plate, purity: 99.0%, size: 100mm×50mm×5mm.

[0037] (3) Etching solution: 3mol / L HCL solution.

[0038] 2. Preparation method

[0039] 1. Preparation of Al-Si alloy precursor:

[0040] Put the aluminum-silicon powder on the base material aluminum plate (100mm×50mm×5mm), the preset thickness is about 2mm, use IPG fiber laser YLS-6000 for cladding, laser power: 5kW, spot diameter: 5mm, scanning speed: 4mm / s, protective gas: argon, protective gas flow rate: 15L / min, and then use wire cutting to separate the cladding layer from the substrate to obtain the precursor alloy material.

[0041] 2. Diffusion welding:

[0042] The aluminum-silicon alloy precursor and the copper current collector are closely attached, heated in a vacuum for 1 hour, and the temperature is raised from room temperature to 520°C, and a pressure of 0.5KPa is applied to it, so that the mi...

Embodiment 3

[0046] 1. Raw materials:

[0047] (1) Aluminum-silicon alloy powder (-325 mesh, 99%), Al:Si=50:50wt.%.

[0048] (2) Aluminum plate, purity: 99.0%, size: 100mm×50mm×5mm.

[0049] (3) Etching solution: 3mol / L HCL solution.

[0050] 2. Preparation method

[0051] 1. Preparation of Al-Si alloy precursor:

[0052] Put the aluminum-silicon powder on the base material aluminum plate (100mm×50mm×5mm), the preset thickness is about 1.5mm, use IPG fiber laser YLS-6000 for laser cladding, laser power: 5.5kW, spot diameter: 5mm, scanning Speed: 6mm / s, protective gas: argon, protective gas flow rate: 15L / min, and then use wire cutting to separate the cladding layer from the substrate to obtain the precursor alloy material.

[0053] 2. Diffusion welding:

[0054] The aluminum-silicon alloy precursor and the copper current collector are closely attached, heated in a vacuum for 1 hour, and the temperature is raised from room temperature to 520°C, and a pressure of 0.5KPa is applied to it, ...

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PUM

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Abstract

The invention discloses a method for producing a lithium ion battery silicon cathode through combination of laser cladding, diffusion welding and dealloying. The method is characterized by including preparing an aluminum-silicon alloy precursor according to the laser cladding technology, welding the aluminum-silicon alloy precursor to a current collector through diffusion welding, and removing element aluminum in the precursor by a corrosive agent to finally obtain the silicon cathode subjected to current collector metallurgical bonding. The method has the advantages that shedding of silicon materials and the current collector of the produced silicon cathode can be avoided effectively during charging and discharging, operation is simple and efficiency is high.

Description

technical field [0001] The invention relates to the field of preparation of negative poles of lithium ion batteries, in particular to a method for preparing silicon negative poles of lithium ion batteries by laser cladding composite diffusion welding and dealloying. Background technique [0002] In the fields of portable electronic products, electric vehicles, wireless communications, and storage and application of renewable energy, it is imminent to develop high-performance lithium-ion batteries with high specific energy and long cycle life, and their performance mainly depends on the battery anode material. At present, the commercial lithium-ion battery anode is mainly made of graphite carbon material, which has the advantages of good cycle stability and long life, but the capacity is close to the theoretical value of 372mAh / g, which cannot meet the extensive needs of large-capacity and high-power chemical power sources. [0003] Silicon has a strong ability to intercalate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395Y02E60/10
Inventor 黄婷孙丁月肖荣诗杨武雄
Owner BEIJING UNIV OF TECH
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