Method for inhibiting dendritic crystal growth when metal lithium is used as battery negative electrode

A battery anode, metal lithium technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as inability to suppress dendrite growth, improve Coulomb efficiency, discharge capacity, battery stability, and inhibit dendrite growth. crystal growth, growth inhibition effect

Inactive Publication Date: 2019-05-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for suppressing dendrite growth when lithium metal is used as t

Method used

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  • Method for inhibiting dendritic crystal growth when metal lithium is used as battery negative electrode
  • Method for inhibiting dendritic crystal growth when metal lithium is used as battery negative electrode
  • Method for inhibiting dendritic crystal growth when metal lithium is used as battery negative electrode

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Embodiment 1

[0039] A method for suppressing dendrite growth when metallic lithium is used as a battery negative electrode, comprising the following steps:

[0040] (1) Prepare 10mL of urea solution with a concentration of 0.2mol / L, then soak a carbon arrangement with a specification of 2*6cm in it, let it stand for 12h, then dry it in an oven at 60°C for 6h, and then dry the dried The carbon is arranged in a quartz tube with a specification of 1*20cm and sealed, and the sealed quartz tube is placed in a muffle furnace, and after 3 hours of heat preservation at 600 ° C, the product is taken out and cooled to room temperature to obtain graphite phase nitrogen carbide Evenly wrapped carbon cloth;

[0041] (2) In an anhydrous, oxygen-free and argon-filled glove box, a metal lithium foil with a diameter of 16 mm was used as the negative electrode, and then the carbon cloth prepared in step (1) was cut into a disc with a diameter of 18 mm to make it as For the electrode, use DOL / DME dissolved ...

Embodiment 2

[0043] A method for suppressing dendrite growth when metallic lithium is used as a battery negative electrode, comprising the following steps:

[0044] (1) Prepare 10mL of urea solution with a concentration of 0.1mol / L, then soak a carbon arrangement with a specification of 2*6cm in it, let it stand for 10h, and then dry it in an oven at 60°C for 5h, and then dry the dried The carbon is arranged in a quartz tube with a specification of 1*20cm and sealed, and the sealed quartz tube is placed in a muffle furnace. After 5 hours of heat preservation at 500 ° C, the product is taken out and cooled to room temperature to obtain graphite phase nitrogen carbide Evenly wrapped carbon cloth;

[0045] (2) In an anhydrous, oxygen-free and argon-filled glove box, a metal lithium foil with a diameter of 16 mm was used as the negative electrode, and then the carbon cloth prepared in step (1) was cut into a disc with a diameter of 18 mm to make it as For the electrode, use DOL / DME dissolved ...

Embodiment 3

[0047] A method for suppressing dendrite growth when metallic lithium is used as a battery negative electrode, comprising the following steps:

[0048](1) Prepare 10mL of urea solution with a concentration of 0.5mol / L, then soak a carbon arrangement with a specification of 2*6cm in it, let it stand for 15h, then dry it in an oven at 60°C for 5h, and then dry the dried The carbon is arranged in a quartz tube with a specification of 1*20cm and sealed, and the sealed quartz tube is placed in a muffle furnace, and after 5 hours of heat preservation at 600 ° C, the product is taken out and cooled to room temperature to obtain graphite phase nitrogen carbide Evenly wrapped carbon cloth;

[0049] (2) In an anhydrous, oxygen-free and argon-filled glove box, a metal lithium foil with a diameter of 16 mm was used as the negative electrode, and then the carbon cloth prepared in step (1) was cut into a disc with a diameter of 18 mm to make it as For the electrode, use DOL / DME dissolved i...

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Abstract

The invention discloses a method for inhibiting dendritic crystal growth when metal lithium is used as a battery negative electrode. The specific process of the method comprises the following steps: attaching a nitrogen-containing material to a substrate material with a three-dimensional bracket structure, and then depositing metal lithium between the nitrogen-containing material and the substratematerial. On one hand, the specific surface area of the electrode current collector can be increased, the actual current density of the electrode surface is reduced to prolong the dendritic crystal growth time, and dendritic crystal growth is inhibited; on the other hand, under the action of the protective layer, lithium ion distribution is adjusted, the phenomenon that the local lithium ion concentration is too high is reduced, dendritic crystal growth is inhibited, and meanwhile, the protective layer has the effect of physically inhibiting dendritic crystal growth.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a method for suppressing dendrite growth when metallic lithium is used as a battery negative electrode. Background technique [0002] Lithium metal flakes have a low density and have extremely high specific capacity and the lowest redox potential as a negative electrode material for lithium batteries. With the rapid development of mobile electronic devices, new energy vehicles, etc., the energy density of batteries is crucial. Therefore, the development and utilization of metal lithium secondary batteries has become a research hotspot. However, the high reactivity of lithium metal, the tendency to grow dendrites, and the large volume expansion seriously restrict the development of lithium metal batteries. In order to alleviate the problems existing in metal lithium batteries, current studies have proposed to introduce a protective film to inhibit dendrite ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M4/66H01M10/0525
CPCY02E60/10
Inventor 康毅进徐英李涛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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