Lithium metal secondary battery based on porous ceramic composite lithium metal negative electrode and preparation method thereof

A technology of porous ceramics and metal negative electrodes, applied in the field of high specific energy lithium metal secondary batteries, can solve the problems of uncontrolled lithium dendrite growth, low battery coulombic efficiency, battery safety problems, etc. Simple preparation method and high coulombic efficiency

Active Publication Date: 2021-04-13
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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  • Lithium metal secondary battery based on porous ceramic composite lithium metal negative electrode and preparation method thereof
  • Lithium metal secondary battery based on porous ceramic composite lithium metal negative electrode and preparation method thereof
  • Lithium metal secondary battery based on 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 specifically discloses a lithium metal secondary battery based on a porous ceramic composite lithium metal negative electrode and a preparation method thereof; the porous ceramic lithium metal negative electrode consists of a porous ceramic skeleton, a conductive layer, a lithium metal Composition, compared with the traditional lithium sheet negative electrode, the advantage of the porous ceramic lithium metal negative electrode disclosed by the present invention is: the porosity of the porous ceramic framework can provide sufficient storage space for lithium metal; the rigidity of the porous ceramic framework can maintain the lithium metal negative electrode Structural stability; the large specific surface area of ​​the porous ceramic framework can effectively reduce the local current density of the lithium metal anode and alleviate the growth of lithium dendrites. Based on the above advantages, the porous ceramic lithium metal composite negative electrode of the present invention can be used to prepare high specific energy lithium metal secondary batteries, and at the same time, the preparation method is simple, and mass production can be realized.

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, and a high specific energy lithium metal secondary battery prepared therefrom, including an organic electrolyte system lithium ion battery and a 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 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 wide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525H01M10/058
CPCH01M4/362H01M4/382H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 金超孙家文杨瑞枝潘晓伟
Owner SUZHOU UNIV
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