Electrode sheet for lithium metal battery, preparation method thereof, and lithium metal battery

A lithium metal battery and metal lithium sheet technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem of increasing the contact between the positive and negative electrodes of lithium batteries, poor thermal deformation resistance of the diaphragm, and local charge distribution Inhomogeneity problems, achieve low overpotential, good wettability, and inhibit dendrite growth

Active Publication Date: 2022-01-11
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) From the perspective of the negative electrode interface, firstly, the initial dendrite protrusions at the interface between the negative electrode and the electrolyte cause uneven local charge distribution and accelerate the growth of lithium dendrites; secondly, the formation of lithium dendrites at the negative electrode makes the cycle process The solid electrolyte interface film (Solid ElectrolyteInterface, SEI) is continuously regenerated on the surface of lithium metal, which affects the coulombic efficiency of the battery
However, the above-mentioned diaphragm has poor thermal deformation resistance, which will increase the probability of contact between the positive and negative electrodes of the lithium battery.

Method used

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  • Electrode sheet for lithium metal battery, preparation method thereof, and lithium metal battery
  • Electrode sheet for lithium metal battery, preparation method thereof, and lithium metal battery
  • Electrode sheet for lithium metal battery, preparation method thereof, and lithium metal battery

Examples

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preparation example Construction

[0034] The present invention also provides a method for preparing a negative electrode sheet for a lithium metal battery, comprising the following steps:

[0035] Under the condition of protective atmosphere, apply physical pressure to compound the sponge and lithium sheet to obtain the negative electrode sheet.

[0036] First, cut the sponge to the required thickness, and then cut it to get a certain size of sponge piece;

[0037] Then superimpose the sponge sheet and the lithium sheet, and apply physical pressure under the condition of protective atmosphere to obtain a composite sheet;

[0038] Wherein, the protective atmosphere condition is selected from argon atmosphere, and the water and oxygen content in the protective atmosphere are all less than 0.1ppm. In the present invention, the compression process of the sponge sheet and the lithium sheet is preferably carried out in a glove box. The present invention preferably employs a hydraulic encapsulation machine to apply...

Embodiment 1

[0062] Preparation of lithium metal battery with melamine sponge and metal lithium composite elastic interface material without diaphragm structure design and symmetric battery cycle test:

[0063] Cut the prepared clean sponge material with a scalpel to a thickness of 2.5mm; then use a punch to cut out a sponge disc with a diameter of 16mm; the density of the sponge is 0.01-0.02g / cm 3 , the porosity is 98% to 99%, and the pore diameter is 50 to 100 μm. see figure 1 , figure 1 It is the optical micrograph (left) and SEM picture (right) of the sponge material selected in Examples 1 and 2 of the present invention.

[0064] Put the sponge material at 150°C for 1 hour, and take pictures of its state and size before and after. The results are shown in figure 2 , figure 2 It is a comparison of the digital photos of the sponge material selected in Examples 1 and 2 of the present invention and the polypropylene diaphragm before being kept at 150° C. for 1 hour. figure 2 Among ...

Embodiment 2

[0074] Lithium metal battery preparation and half-cell coulombic efficiency test of sponge, metal lithium composite elastic interface material without diaphragm structure design:

[0075] The sponge with a thickness of 2.5 mm prepared in Example 1 was used to prepare a new type of composite electrode, and a new type of lithium metal battery was assembled by designing a non-diaphragm structure. The difference from Example 1 is that the battery structure used to test the coulombic efficiency of the half-cell is: negative electrode casing, lithium sheet-sponge, electrolyte, copper sheet, gasket, shrapnel, and positive electrode casing. see Figure 5 , Figure 5 Schematic diagram of the structure of a lithium metal battery (model: CR2032) designed for the sponge-metal lithium composite electrode without a diaphragm structure for testing the Coulombic efficiency in Example 2 of the present invention.

[0076] The lithium metal sheet and copper sheet used in the experiment were pu...

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Abstract

The invention provides a negative pole piece for a lithium metal battery, which is formed by pressing a metal lithium piece and a sponge. When the negative pole piece provided by the present invention is applied to a lithium metal battery, the structure of the traditional lithium metal battery can be simplified, and a sponge elastic interface layer can be introduced instead of the diaphragm to play an electronic barrier effect. The introduction of this elastic interface material can relieve the battery cycle Volume changes as well as interfacial instability inside the battery. In addition, the wettability between the sponge medium layer and the electrolyte is very good, and it has stronger thermal deformation resistance than the commonly used polypropylene diaphragm (Polypropylene). At the same time, the elastic three-dimensional skeleton structure of the sponge is conducive to inhibiting the dendrite growth during the cycle of lithium metal batteries; it is also conducive to alleviating the volume change of the negative electrode. Therefore, this composite metal lithium anode with no separator structure designed using sponge materials can promote the further development of lithium metal batteries from another perspective.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to an electrode sheet for a lithium metal battery, a preparation method thereof, and a lithium metal battery. Background technique [0002] On the one hand, due to the current highest theoretical capacity (3860mA h g -1 ), the lowest electrochemical potential (-3.04V), lower density (0.534g cm -3 ) and other advantages, the metal lithium anode is considered to be the development direction of the next generation energy storage system. On the other hand, with the development of next-generation high-energy battery systems, such as the research and development of lithium-air batteries and lithium-sulfur batteries, the application research of lithium metal batteries has also highlighted its importance. However, due to the high activity of lithium metal itself and the unsolved problems of lithium dendrites, its safety and cyclability limit commercial applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 朱彦武余晗王欣媛谢兼
Owner UNIV OF SCI & TECH OF CHINA
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