A lithium metal negative electrode and its preparation and application

A lithium metal negative electrode, lithium metal technology, applied in the direction of negative electrodes, battery electrodes, lithium batteries, etc., can solve the problems of reducing the coulombic efficiency and cycle life of lithium metal batteries, low room temperature ion conductivity, and reducing ion conductivity, etc., to achieve Promotes uniform nucleation, improves electrical conductivity, and improves deposition uniformity

Active Publication Date: 2022-08-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium metal will spontaneously react with the electrolyte to form a solid electrolyte interface film (SEI), which is continuously damaged and repaired as the volume of the negative electrode expands during the charge-discharge cycle, resulting in continuous consumption of lithium metal and electrolyte, reducing the Coulombic efficiency of lithium metal batteries and cycle life
[0004] At present, relevant solutions have been proposed, and the growth of dendrites can be suppressed by designing a 3D framework structure and using a solid electrolyte, but there are still some problems to be solved urgently.
The 3D skeleton structure can slow down the growth of dendrites by reducing the current density, but it cannot isolate the direct contact between lithium metal and the electrolyte to inhibit the occurrence of side reactions; while the inorganic solid-state electrolysis has high mechanical strength, but the interface impedance is large, and the contact with lithium metal is poor. ; Although the polymer electrolyte has good flexibility and elasticity, the ionic conductivity at room temperature is relatively low (about 10 -7 S cm -1 )
However, the method of using sputtering treatment is relatively complicated, and the dense silicon oxide layer will reduce the ion conductivity and increase the interface resistance

Method used

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  • A lithium metal negative electrode and its preparation and application
  • A lithium metal negative electrode and its preparation and application
  • A lithium metal negative electrode and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Glass plates are placed on both sides of the lithium sheet to form a laminated structure, and a polyethylene film (thickness 25 μm) is placed between the lithium sheet and the glass plate, and then the lithium sheet is pressed on the side of the glass plate away from the lithium sheet , the pressure is 0.2MPa, and the time is 20s; the lithium sheet with a diameter of 1.6mm and a thickness of 700μm is extruded with a glass plate padded with a polyethylene film to obtain a bright lithium sheet PLi (PLi means the extruded lithium sheet); Soak in tetrabutyl titanate for ex-situ reaction for 10 s, take out PLi and wipe off the tetrabutyl titanate liquid on the lithium surface with a non-woven fabric, dry for 15 min, and obtain an oxide layer (titanium oxide) with a thickness of about 500 nm. Lithium metal anode. A symmetrical battery was assembled using the treated lithium sheet as the electrode, celgard2325 as the separator, 1M lithium bis(trifluoromethylsulfonyl)imide (LiT...

Embodiment 2

[0033] According to the process of Example 1, a glass plate with a diameter of 1.6 mm and a thickness of 700 μm was used to extrude a lithium sheet with a thickness of 700 μm to obtain a bright lithium sheet PLi; the PLi was immersed in tetrabutyl titanate for ex-situ reaction After 1 min, the PLi was taken out and the tetrabutyl titanate liquid on the lithium surface was wiped off with a non-woven fabric, and dried for 15 min to obtain a lithium metal negative electrode with an oxide layer (titanium oxide) with a thickness of about 800 nm. A symmetric battery was assembled using the treated lithium sheet as an electrode, and a lithium|lithium symmetric battery was assembled according to the method and conditions of Example 1. 1mA / cm 2 at a current density of 1mAh / cm 2 The deposition-dissolving capacity was carried out for charge-discharge cycles.

Embodiment 3

[0035] According to the process of Example 1, a glass plate with a diameter of 1.6 mm and a thickness of 700 μm was used to extrude a lithium sheet with a thickness of 700 μm to obtain a bright lithium sheet PLi; the PLi was immersed in tetrabutyl titanate for ex-situ reaction After 5 minutes, the PLi was taken out and the tetrabutyl titanate liquid on the lithium surface was wiped off with a non-woven fabric, and dried for 15 minutes to obtain a lithium metal negative electrode with an oxide layer (titanium oxide) with a thickness of about 1 μm. A symmetric battery was assembled using the treated lithium sheet as an electrode, and a lithium|lithium symmetric battery was assembled according to the method and conditions of Example 1. 1mA / cm 2 at a current density of 1mAh / cm 2 The deposition-dissolving capacity was carried out for charge-discharge cycles.

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Abstract

This patent proposes the preparation and application of a lithium metal negative electrode with an oxide layer. The extruded lithium metal is soaked in organic esters, and ex-situ hydrolysis and polycondensation form a stable porous oxide layer, which effectively inhibits the continuous reaction and consumption of the electrolyte and lithium metal, and improves the battery cycle stability.

Description

technical field [0001] The invention relates to the preparation and application of a lithium metal negative electrode with an oxide layer. Background technique [0002] Currently, the world market for electric vehicles and portable electronic devices including passenger cars, buses and passenger cars is growing rapidly. Lithium-ion batteries with high charge-discharge voltage and long cycle life are widely used as power sources for portable electronic devices and electric vehicles, but due to the limitation of their theoretical energy density, new electrode materials with higher energy density need to be developed. Among them, lithium metal as anode material has a high theoretical energy density (3860mAh g -1 ) and the advantages of low electrochemical potential (-3.040V vs. SHE) have attracted great attention from researchers in recent years. [0003] However, there are still two problems to be solved in the application of lithium metal anodes. One is the lithium dendrit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M10/052H01M2004/027Y02E60/10
Inventor 张洪章李先锋罗洋张华民阎景旺
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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