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Porous ceramic composite lithium metal negative electrode and preparation method thereof

A porous ceramic and metal negative electrode technology, which is applied in the field of lithium metal negative electrodes, can solve the problems of uncontrolled growth of lithium dendrites, battery safety issues, and low battery Coulombic efficiency, and achieve mass production, simple preparation methods, and structural high intensity effect

Active Publication Date: 2020-04-03
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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  • Porous ceramic composite lithium metal negative electrode and preparation method thereof
  • Porous ceramic composite lithium metal negative electrode and preparation method thereof
  • Porous ceramic composite lithium metal negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Accurately weigh 5.4g of cerium oxide (CeO 2 ) powder and 0.6g PMMA powder were added to an agate mortar and ground for 20min to obtain a uniform mixed powder. Then accurately weigh 0.6g of polyethersulfone (PESf) powder and mix it into the above powder, then add 2.5ml of N,N-dimethylpyrrolidone (NMP) into it, and grind for 30 minutes to obtain a uniform viscous slurry. Transfer the slurry to a vacuum oven at room temperature and let it stand for 2 minutes to remove the air bubbles in the slurry. Then use a scraper with a thickness of 500um and use a coating machine to evenly coat the above viscous slurry on the cutting surface at a speed of 1m / min. On a good flat aluminum foil, then immerse the aluminum foil coated with slurry in 30mL ethylene glycol, soak for 24h, separate the cerium oxide film from the aluminum foil, wash the cured cerium oxide film separated from the aluminum foil with alcohol and dry it at 60°C Carry out drying in the oven, be referred to as dry f...

Embodiment 2

[0042] Accurately weigh 4.8g Li6.6La3Zr1.6Ta0.4O12 (LLZTO) solid electrolyte powder and 1.2g plant starch powder and add them into an agate mortar and grind for 20min to obtain a uniform mixed powder. Then accurately weigh 0.6g of polyvinylidene fluoride (PVDF) powder and mix it into the above powder, then add 2ml of N,N-dimethyl sulfoxide (DMSO) to it, and then quickly grind for 30 minutes to obtain a uniform viscous slurry. Transfer the slurry to a vacuum oven at room temperature and let it stand for 2 minutes to remove air bubbles in the slurry. Then use a scraper with a thickness of 1000um and use a coating machine to evenly coat the mixed slurry to the cut flat surface at a speed of 1m / min. On the aluminum foil, dip the coated slurry together with the aluminum foil in 50 mL of isopropanol. After soaking for 24 h, the cured LLZTO film separated from the aluminum foil was washed with alcohol and dried in an oven at 60 °C.

[0043] The dried LLZTO film was cut into discs wi...

Embodiment 3

[0046] Accurately weigh 5.7g Li0.35La0.55TiO3 (LLTO) powder and 0.3g acetylene black powder and add them into an agate mortar and grind for 20min to obtain a uniform mixed powder. Then accurately weigh 0.6g of polyethersulfone (PESf) powder and mix it into the above powder, then add 2.5ml of N,N-dimethylpyrrolidone (NMP) into it, and then quickly grind for 30min to obtain a uniform viscous slurry. Transfer the slurry to a vacuum oven at room temperature and let it stand for 2 minutes to remove the air bubbles in the slurry. Then use a scraper with a thickness of 400um and use a coating machine to evenly coat the mixed slurry to the cut flat surface at a speed of 1m / min. On the aluminum foil, immerse the coated slurry together with the aluminum foil in 30mL ultrapure water. After soaking for 24 hours, the cured film separated from the aluminum foil was washed with alcohol and dried in an oven at 60°C. It is called dry film in the accompanying drawings, and it is the same in th...

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Abstract

The invention belongs to the field of high-specific-energy lithium metal batteries, and particularly 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 compared with a traditional lithium sheet negative electrode, the porous ceramic lithium metal negative electrode disclosed by the invention has the advantages that the porosity of the porous ceramic skeleton can provide sufficient storage space for the lithium metal; the rigidity of the porous ceramic skeleton can maintain the structural stability of the lithium metal negative electrode; the large specific surface area attribute of the porous ceramic skeleton can effectively reduce the local current density of the lithium metal negative electrode and relieve the growth problem of lithium dendrites; the composite negative electrode has the characteristics of high structural strength, high coulombic efficiency, low polarization, no lithium dendrites, good cycling stability and the like, meanwhile, the preparation method is simple, and large-batch manufacturing can be realized. The porous ceramic lithium metal composite negative electrode can be used for preparing a high-specific-energy lithium metal secondary battery, including an organic electrolyte system lithium ion battery, a lithium-air battery, an all-solid-state lithium ion battery, a lithium-air battery and the like.

Description

technical field [0001] The invention belongs to the field of lithium metal secondary batteries, in particular to a lithium metal negative electrode based on a porous ceramic host, which 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-state lithium-ion batteries and lithium-air batteries, etc. Background technique [0002] With the popularity of electric vehicles and various electronic products, high specific energy secondary lithium batteries have become a research hotspot in recent years. Due to its high energy density and low chemical potential (-3.04 V vs. RHE), lithium metal has great prospects in the application field of high specific energy lithium secondary batteries. However, during repeated charging and discharging, lithium dendrites grow uncontrollably, which can easily pierce the separator and cause battery safety issues, which limits its...

Claims

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Application Information

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Patent Type & Authority Applications(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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