Composite negative electrode and its preparation method and application

A technology of negative electrode and negative electrode sheet, which is applied in the field of composite negative electrode and its preparation, can solve the problems of lithium dendrite growth, battery short circuit, etc., and achieve the effects of uniform deposition, avoiding internal short circuit, and high capacity

Active Publication Date: 2022-02-25
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a composite negative electrode and its preparation method and application to solve the problem of lithium dendrite growth on the surface of the negative electrode and short circuit in the battery caused by the uneven deposition of lithium ions, so as to prevent or suppress lithium dendrites. The purpose of production and growth, thereby significantly improving the cycle performance, rate performance, safety performance and service life of the battery, etc.

Method used

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  • Composite negative electrode and its preparation method and application
  • Composite negative electrode and its preparation method and application
  • Composite negative electrode and its preparation method and application

Examples

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Effect test

Embodiment 1

[0067] In a dry room environment with a dew point less than -40°C, transfer the silicon-coated aluminum foil to a copper-lithium composite tape, cut it into a square piece of 10×10mm, fix it on a stainless steel evaporation substrate with tape, and place the composite substrate on the In the vacuum chamber of the evaporation equipment, place a tungsten boat containing 5g of pure magnesium at the position of the evaporation source, and evacuate until the vacuum degree reaches 5.0×10 -4 , adjust the heating temperature of the substrate to 100°C, and the rotation rate of the substrate is 8 revolutions / min. By adjusting the current applied to the tungsten boat, the evaporation rate is controlled to 0.01nm / s, and the evaporation is continued while the evaporation rate is kept stable. When the film thickness meter shows that the vapor deposition thickness is 300nm, stop the vapor deposition. After the substrate heating temperature drops to room temperature, open the vent valve to res...

Embodiment 2

[0069] In a dry room environment with a dew point less than -40°C, transfer the carbon-coated aluminum foil to a copper-lithium composite tape, cut it into a square piece of 10×10mm, fix it on a stainless steel evaporation substrate with tape, and place the composite substrate on the In the vacuum chamber of the evaporation equipment, place a tungsten boat containing 5g of pure silver at the position of the evaporation source, and evacuate until the vacuum degree reaches 5.0×10 -4 , adjust the heating temperature of the substrate to 100°C, and the rotation rate of the substrate is 8 revolutions / min. By adjusting the current applied to the tungsten boat, the evaporation rate is controlled to 0.01nm / s, and the evaporation is continued while the evaporation rate is kept stable. When the film thickness meter shows that the evaporation thickness is 400nm, stop the evaporation. After the substrate heating temperature drops to room temperature, open the vent valve to restore the vacuu...

Embodiment 3

[0071] In a dry room environment with a dew point less than -40°C, transfer the carbon-coated aluminum foil to a copper-lithium composite tape, cut it into a square piece of 10×10mm, fix it on a stainless steel evaporation substrate with tape, and place the composite substrate on the In the vacuum chamber of the evaporation equipment, place a tungsten boat containing 5g of pure gold at the position of the evaporation source, and evacuate until the vacuum degree reaches 3.0×10 -4 , adjust the heating temperature of the substrate to 100°C, and the rotation rate of the substrate is 10 revolutions / min. By adjusting the current applied to the tungsten boat, the evaporation rate is controlled to 0.01nm / s, and the evaporation is continued while the evaporation rate is kept stable. Stop the evaporation until the film thickness meter shows that the evaporation thickness is 500nm. After the substrate heating temperature drops to room temperature, open the vent valve to restore the vacuum...

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Abstract

The invention discloses a composite negative electrode and its preparation method and application, wherein the composite negative electrode includes a metal composite layer and a negative electrode sheet matrix, and the metal composite layer includes a negative electrode material layer and metal nanoparticles infiltrated into the negative electrode material layer; The negative plate substrate has a lithium metal layer, and the metal composite layer is attached to the lithium metal layer. The composite negative electrode uses the alloying confinement effect of metal nanoparticles and lithium ions to control lithium dendrites, delay or inhibit the deposition of lithium ions on the lithium metal layer, and make lithium ions relatively uniformly deposited and nucleated on each channel. and growth, which solves the problem of lithium dendrite growth on the surface of the negative electrode and short circuit in the battery caused by uneven deposition of lithium ions, and can significantly improve the cycle performance, rate performance, safety performance and service life of the battery.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a composite negative electrode and a preparation method and application thereof. Background technique [0002] With the development of large-scale and multi-functional electrical equipment, higher requirements are placed on the energy density and service life of lithium-ion secondary batteries, and due to the rapid development and wide application of various portable electronic equipment and electric vehicles, There is an urgent need for lithium-ion batteries with high energy and long cycle life. At present, the negative electrode material of commercial lithium-ion batteries is mainly graphite. Due to its low theoretical capacity (372mAh / g) and poor high-rate charge and discharge performance, the further improvement of lithium-ion battery energy is limited. However, silicon carbon materials face the problems of material pulverization caused by low initial charge and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525
CPCH01M4/364H01M4/386H01M4/38H01M4/382H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 陈少杰黄海强郑晓醒秦士林马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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