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A method for preparing a solid electrolyte interface film on a lithium metal surface

A technology of solid electrolyte and interfacial film, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, lithium battery, etc., can solve the problems of harsh preparation conditions of artificial SEI film, high cost of high-concentration electrolyte, complicated process, etc., to achieve the regulation of lithium Ion deposition, improvement of safety performance and cycle performance, and the effect of mature technology

Inactive Publication Date: 2019-01-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these physical or chemical methods to construct artificial SEI films of metal lithium have harsh preparation conditions and complicated procedures, and high-concentration electrolytes also limit their real application due to high costs.

Method used

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  • A method for preparing a solid electrolyte interface film on a lithium metal surface

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Embodiment 1

[0037] Lithium bis(trifluoromethylsulfonyl)imide is dissolved in 1,3-dioxolane and ethylene glycol dimethyl ether (volume ratio 1:1), and lithium nitrate and fluoroethylene carbonate are added to form a precursor solution, the concentration of lithium bis(trifluoromethylsulfonyl)imide is 0.1molL -1 , the concentration of lithium nitrate is 0.01mol L -1 , the concentration of fluoroethylene carbonate is 0.02mol L -1 , the lithium sheet was placed on the surface of the heating table and kept at a constant temperature of 180°C. The peristaltic pump of the spray generator operates at a flow rate of 2.5mLmin -1 Transport the precursor solution, atomize it into droplets through the ultrasonic nozzle, and carry it with the carrier argon gas 100Lh -1 Spray on the surface of the heated lithium sheet, control the spraying time for 3s and stop the heating on the heating table 15s after the spraying ends. After cooling, a composite lithium metal pole piece with a solid electrolyte int...

Embodiment 2

[0039] Lithium hexafluorophosphate is dissolved in ethylene carbonate and diethyl carbonate (volume ratio 2:3), and lithium nitrate and vinylene carbonate are added to form a precursor solution. The concentration of lithium hexafluorophosphate is 0.2mol L -1 , the concentration of lithium nitrate is 0.05mol L -1 , the concentration of vinylene carbonate is 0.02mol L -1 , the lithium sheet was placed on the surface of the heating table and kept at a constant temperature of 200°C. The peristaltic pump of the spray generator with a flow rate of 1.0mLmin -1 Transport the precursor solution, atomize it into droplets through the ultrasonic nozzle, and carry it with the carrier argon gas 200Lh -1 Spray on the surface of the heated lithium sheet, control the spraying time for 5s and stop the heating on the heating table 30s after the spraying ends. After cooling, a composite lithium metal pole piece with a solid electrolyte interface film is prepared. Install a lithium metal symme...

Embodiment 3

[0041] Lithium bisoxalate borate was dissolved in ethyl methyl carbonate and tetrahydrofuran (volume ratio 2:1), and fluoroethylene carbonate and lithium polysulfide (Li 2 S 6 ) to form a precursor solution, the concentration of bisoxalate lithium borate is 0.5mol L -1 , the concentration of fluoroethylene carbonate is 0.5mol L -1 , the concentration of lithium polysulfide is 0.05mol L -1 , the lithium sheet was placed on the surface of the heating table and kept at a constant temperature of 400°C. The peristaltic pump of the spray generator operates at a flow rate of 0.5mLmin -1 Transport the precursor solution, atomize it into droplets through the ultrasonic nozzle, and carry it with the carrier argon gas 600Lh -1 Spray on the surface of the heated lithium sheet, control the spraying time for 10s and stop the heating on the heating table after the spraying ends for 5s. After cooling, a composite lithium metal pole piece with a solid electrolyte interface film is prepare...

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Abstract

The invention discloses a method for preparing a solid electrolyte interface film on the surface of a lithium metal, a device for preparing the solid electrolyte interface film by a spray pyrolysis method, comprising a heating table for placing lithium sheets and heating; A nozzle aligned with the heating station; A spray generator and a precursor solution storage tank connected to the nozzle; A stable solid electrolyte membrane was prepared on the surface of lithium slices by spray pyrolysis of a precursor solution containing suitable solute and solvent. Compared with the lithium sheet without modification, the composite lithium metal anode material of the present invention has the characteristics of high coulombic efficiency, high lithium metal utilization ratio, remarkable inhibition ofdendrite growth, and the like, thereby remarkably improving the cycling performance and safety performance of the lithium metal. This technology is simple and easy to operate and is conducive to large-scale production, and has broad application prospects and guiding significance in the next generation of high energy density lithium metal secondary batteries.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium metal secondary batteries, in particular to a method for preparing a solid electrolyte interface film on the surface of lithium metal using a spray pyrolysis device for preparing a solid electrolyte interface film. Background technique [0002] In the 1970s, Exxon designed the world's first lithium battery using titanium sulfide as the positive electrode material and metallic lithium as the negative electrode material. However, due to the safety of lithium metal, it was not until 1991 that Sony Corporation adopted graphite as the negative electrode that it promoted the real commercial application of lithium-ion batteries. But because the theoretical capacity of graphite material is only 372mAh g -1 , so its application is actually at the expense of lower battery energy density. As the most ideal anode material, pure Li metal has a capacity of up to 3860mAh g -1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/052
CPCH01M10/052H01M10/0565H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 夏新辉刘苏福王秀丽涂江平
Owner ZHEJIANG UNIV
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