A kind of porous ceramic composite lithium metal negative electrode and preparation method thereof

A porous ceramic and metal negative electrode technology, applied in the field of lithium metal negative electrode, can solve the problems of poor cycle stability, uncontrolled growth of lithium dendrites, easy to pierce the separator, etc.

Active Publication Date: 2021-04-27
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of repeated charging and discharging, the growth of lithium dendrites is uncontrolled, which can easily pierce the separator and cause battery safety issues, which limits its wide application.
In addition, the repeated formation and rupture of the SEI film continuously consumes metal lithium and electrolyte, resulting in low Coulombic efficiency and poor cycle stability of the battery.

Method used

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  • A kind of porous ceramic composite lithium metal negative electrode and preparation method thereof
  • A kind of porous ceramic composite lithium metal negative electrode and preparation method thereof
  • A kind of porous ceramic composite lithium metal negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Accurate weighing 5.4 g of cerium oxide (CEO2The powder was grinded from 0.6 g of PMMA powder and was added to the agate mortar for 20 min to obtain a uniform mixed powder. A 0.6 g of a polyether sulfone (PESF) powder was reproduced into the powder, and then 2.5 ml of N, N-dimethylpyrrolidone (NMP) was added thereto, and a uniform viscous slurry was obtained from 30 min. Transferring the slurry to the normal temperature vacuum oven to stand 2 min to remove the bubbles in the slurry, and then use the coating machine to be uniformly applied to the cropping of the viscous slurry at a speed of 1 m / min using a coating machine at a speed of 1 m / min. In a good flat aluminum foil, the aluminum foil coated with a slurry was immersed in 30 ml of ethylene glycol. After soaking 24 h, the cerium oxide film was separated from the aluminum foil, and the cerium oxide film separated from aluminum foil was washed with aluminum foil and washed at 60 ° C. Drying in the oven, referred to as a ...

Embodiment 2

[0042]Accurately weighed 4.8 g li6.6LA3Zr1.6Ta0.4O12 (LLZTO) solid electrolyte powder and 1.2 g of plant starch powder and added to the agate mortar for 20 minutes to obtain a uniform mixed powder. 0.6 g of the polyvinylidene fluoride (PVDF) powder was reproduced into the powder, then 2 ml N, N-dimethyl sulfoxide (DMSO) was added thereto, and then rapidly ground 30 min to obtain a uniform viscous slurry. Transfer the slurry to the normal temperature vacuum oven to stand 2 min to remove the bubbles in the slurry, and then use the thickness of 1000 um, use the coating machine to uniformly apply the mixed slurry to the cropped flatness at a speed of 1 m / min. On the aluminum foil, the coated slurry is immersed in 50 ml of isopropanol along with the aluminum foil. After soaking for 24 h, the solidified LLZTO film separated from the aluminum foil was washed fine with aluminum foil and dried in a 60 ° C oven.

[0043]The dried LLZTO film was cut into a circumfer of 13 mm, and then placed in...

Embodiment 3

[0046]Accurately weighed 5.7 g Li0.35La0.55TiO3 (LLTO) powder and 0.3 g of acetylene black powder and added to the agate mortar for 20 minutes to obtain a uniform mixed powder. The ratio of 0.6 g of a polyether sulfone (PESF) powder was reproduced into the powder, and then 2.5 ml of N, N-dimethylpyrrolidone (NMP) was added thereto, and then rapidly ground 30 min to obtain a uniform viscous slurry. Transfer the slurry to the normal temperature vacuum oven to stand 2 min to remove the bubbles in the slurry, then use a doctor blade having a thickness of 400 um, use the coating machine to uniformly coat the mixed slurry to the cropping of the cropping of 1 m / min. On the aluminum foil, the coated slurry is immersed in 30 ml of ultrapure water along with the aluminum foil. After soaking 24 h, the cured film isolated from the aluminum foil was washed fine with aluminum foil and dried in an oven at 60 ° C. The drawings are referred to as dry films, as in the following examples.

[0047]The d...

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Abstract

The invention belongs to the field of high specific energy lithium metal batteries, and specifically discloses a porous ceramic composite lithium metal negative electrode and a preparation method thereof; the porous ceramic lithium metal negative electrode is composed of a porous ceramic skeleton, a conductive layer, and lithium metal, and is the same as a traditional lithium sheet Compared with the negative electrode, the advantages of the porous ceramic lithium metal negative electrode disclosed by the present invention are: the porosity of the porous ceramic skeleton can provide sufficient storage space for lithium metal; the rigidity of the porous ceramic skeleton can maintain the structural stability of the lithium metal negative electrode; the porous ceramic The large specific surface area of ​​the framework can effectively reduce the local current density of the lithium metal anode and alleviate the growth of lithium dendrites; the composite anode has high structural strength, high Coulombic efficiency, low polarization, no lithium dendrites, and good cycle stability. characteristics, at the same time, the preparation method is simple, and mass production can be realized. The porous ceramic lithium metal composite negative electrode of the present invention can be used to prepare high specific energy lithium metal secondary batteries, including organic electrolyte system lithium-ion batteries and lithium-air batteries, all-solid lithium-ion batteries and lithium-air batteries, and the like.

Description

Technical field[0001]The present invention belongs to the field of lithium metal secondary battery, and more particularly to a lithium metal negative electrode based on a porous ceramic host, which can be used to prepare high specific lithium metal secondary batteries, including an organic electrolyte system lithium ion battery and lithium-air battery, all Solid-state lithium ion batteries and lithium-air batteries, etc.Background technique[0002]With the popularity of electric vehicles and various electronic products, high-proportional secondary lithium batteries have become a research hotspot in recent years. Lithium metal has great prospects in high-proportionally lithium secondary battery applications due to their high energy density and lower chemical potential (-3.04 V vs.rhe). However, during repeated charge discharge, the lithium branch is not controlled, and it is easy to pierce the diaphragm to cause battery safety problems, which limits its wide application. In addition, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/052H01M12/08
CPCH01M4/362H01M4/485H01M4/625H01M10/052H01M12/08H01M2004/027Y02E60/10
Inventor 金超孙家文杨瑞枝潘晓伟
Owner SUZHOU UNIV
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