Vapor-phase synthesis of porous zn current collectors for lithium metal anodes with controllable thickness

A lithium metal negative electrode, gas-phase synthesis technology, applied in metal material coating process, electrode carrier/current collector, vacuum evaporation plating, etc. High yield, uniform deposition effect

Active Publication Date: 2020-05-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, lithium dendrites are easy to break to form dead lithium, and on the other hand, they may pierce the separator, causing a short circuit in the battery and causing safety problems.

Method used

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  • Vapor-phase synthesis of porous zn current collectors for lithium metal anodes with controllable thickness
  • Vapor-phase synthesis of porous zn current collectors for lithium metal anodes with controllable thickness
  • Vapor-phase synthesis of porous zn current collectors for lithium metal anodes with controllable thickness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: have the vapor phase synthesis method of different thickness Zn film, its synthetic steps are as follows:

[0041] (a) Before sputtering, increase the distance between the target and the substrate and maintain a certain inclination;

[0042] (b) Install the Zn target and connect it to the RF power supply; fix the cleaned quartz glass substrate on the substrate in the high vacuum chamber; start vacuuming to make the background vacuum of each chamber reach 2×10 -4 Pa;

[0043] (c) Adjust the flow meter and the molecular pump to allow Ar gas to flow into the chamber, adjust the pressure of Ar gas to 0.8Pa, turn on the power supply and adjust the power to 40W, start pre-sputtering, and the pre-sputtering time is 1h;

[0044] (d) The deposition rate of the porous film can be measured by SEM. Deposit the porous film directly on the silicon wafer to test the size and shape of the nanoparticles, and deposit the porous film directly on the copper wafer as the lit...

Embodiment 2

[0046] Embodiment 2: have the vapor phase synthesis method of different thickness Zn film, its synthetic steps are as follows:

[0047] (a) Before sputtering, increase the distance between the target and the substrate and maintain a certain inclination;

[0048] (b) Install the Zn target and connect it to the RF power supply; fix the cleaned quartz glass substrate on the substrate in the high vacuum chamber; start vacuuming to make the background vacuum of each chamber reach 2×10 -4 Pa;

[0049] (c) Adjust the flow meter and the molecular pump to allow Ar gas to flow into the chamber, adjust the pressure of Ar gas to 0.8Pa, turn on the power supply and adjust the power to 100W, start pre-sputtering, and the pre-sputtering time is 1h;

[0050] (d) The deposition rate of the porous film can be measured by scanning electron microscopy. The porous film is directly deposited on a silicon wafer to test the size and shape of the nanoparticles. Battery test its coulombic efficiency;...

Embodiment 3

[0052] Embodiment 3: have the vapor phase synthesis method of different thickness Zn film, its synthetic steps are as follows:

[0053] (a) Before sputtering, increase the distance between the target and the substrate and maintain a certain inclination;

[0054] (b) Install the Zn target and connect it to the RF power supply; fix the cleaned quartz glass substrate on the substrate in the high vacuum chamber; start vacuuming to make the background vacuum of each chamber reach 2×10 -4 Pa;

[0055] (c) Adjust the flow meter and the molecular pump to allow Ar gas to flow into the chamber, adjust the pressure of Ar gas to 0.8Pa, turn on the power supply and adjust the power to 150W, start pre-sputtering, and the pre-sputtering time is 1h;

[0056] (d) The deposition rate of the porous film can be measured by scanning electron microscopy. The porous film is directly deposited on a silicon wafer to test the size and shape of the nanoparticles. Battery test its coulombic efficiency;...

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Abstract

The invention discloses a gas phase synthesis method of a lithium metal negative electrode porous Zn current collector with controllable thickness, and relates to a lithium metal battery. The distancebetween a target material and a substrate is increased before the target material is sputtered by adopting a plasma magnetic control sputtering method; the target material is installed, a radio frequency power supply is connected, the substrate is fixed to a vacuum chamber indoor substrate, and vacuumizing is carried out; a flow meter and a molecular pump are adjusted to enable gas Ar to enter achamber, the power supply is turned on to adjust the power, and pre-sputtering is started; the deposition rate of a porous thin film is measured through a scanning electron microscope, the porous thinfilm is directly deposited on a silicon wafer to test the sizes and shapes of nano particles, and the porous thin film is directly deposited on a copper sheet to serve as a lithium metal negative electrode current collector assembled semi-battery, and the coulombic efficiency of the lithium metal negative electrode current collector assembled semi-battery is tested; and a porous metal Zn thin film is used as a working electrode, lithium metal is used as a reference and counting electrode, and a polypropylene diaphragm is used as a diaphragm. A prepared porous lithium metal film has the advantages of being not restrained by the melting point and hardness of materials, simple in process, high in yield and the like, and is suitable for scientific research and large-scale production.

Description

technical field [0001] The invention relates to a lithium metal battery, in particular to a gas-phase synthesis method of a lithium metal negative electrode porous Zn current collector with controllable thickness. Background technique [0002] Lithium-ion batteries play a very important role in energy storage and conversion systems. Especially since the 1990s, various portable commercial electronic devices have further accelerated the development of lithium-ion batteries. In recent years, the development of new energy vehicles has put forward higher requirements for batteries. [1,2] However, the current commercial graphite negative electrode has a low theoretical specific capacity (372mAhg -1 ), it is difficult to meet the increasing energy density demand of the consumer market. [3-5] Therefore, the research and development of high capacity, long cycle life and safe anode materials has become an urgent task to be solved. [0003] The lithium metal anode has a very high th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/18H01M4/66
CPCY02E60/10
Inventor 彭栋梁陈秋林谢清水王来森
Owner XIAMEN UNIV
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