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Organic-inorganic composite solid electrolyte film, preparation method thereof and solid-state lithium metal battery

A solid electrolyte and inorganic composite technology, which is applied in the direction of non-aqueous electrolyte batteries, solid electrolytes, lithium batteries, etc., can solve the problem of low conductivity of the electrolyte membrane, and achieve the effect of simple preparation method, high ion conductivity, and low equipment requirements

Inactive Publication Date: 2020-09-18
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the disclosed prior art, the problem of low conductivity of the solid electrolyte membrane at room temperature still cannot be solved, and the electrochemical test of battery performance needs to be completed at a higher temperature.

Method used

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  • Organic-inorganic composite solid electrolyte film, preparation method thereof and solid-state lithium metal battery
  • Organic-inorganic composite solid electrolyte film, preparation method thereof and solid-state lithium metal battery
  • Organic-inorganic composite solid electrolyte film, preparation method thereof and solid-state lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The ionic liquid is N-methyl-N-methoxyethylpyrrolidine bistrifluoromethanesulfonimide salt (Pyr 1(201) TFSI) as an example:

[0035] The organic-inorganic composite solid electrolyte was prepared by solution casting method. Dispersion of LiTFSI in Pyr by ultrasound 1(201) TFSI to obtain 1mmol g -1 Ionic liquid (denoted as IL). Weigh 1 g of polyvinylidene fluoride powder (PVDF) after vacuum drying (60° C., 24 h), put it in 8 g of NMP and stir for 48 h. The LAGP ceramic powder was ground at 60 °C for 30 min under vacuum. Then, the LAGP and IL obtained by the above pretreatment were added to the PVDF solution, the mass ratio was PVDF:IL:LAGP=100:100:22.5, and the stirring was continued for 12 hours at a speed of 600r / min. The uniform slurry was cast onto a glass plate, and the film was scraped off at a constant speed using a spreader (150 μm). Finally, the film was vacuum-dried at 60°C for 8 hours to remove NMP to obtain an organic-inorganic composite solid electroly...

Embodiment 2

[0044] The ionic liquid in this embodiment is 1-ethyl-3-methylimidazolium bistrifluoromethanesulfonimide salt (EMITFSI).

[0045] The organic-inorganic composite solid electrolyte was prepared by solution casting method. Disperse LiTFSI in EMITFSI by ultrasound to obtain 1 mmol g -1 Ionic liquid (denoted as IL). The LAGP ceramic powder was ground at 60 °C for 30 min under vacuum. Get 0.1g PVDF powder, then weigh IL 0.1g, LAGP powder 22.5mg, add 0.7g NMP (N-methylpyrrolidone) to the above mixture, stir continuously for 12h, and the rotating speed is 600r / min. The uniform slurry was cast onto a glass plate, and the film was scraped off at a constant speed using a spreader (150 μm). Finally, the film was vacuum-dried at 60°C for 8 hours to remove NMP to obtain an organic-inorganic composite solid electrolyte (denoted as PIL10%). It should be noted that since LiTFSI is sensitive to moisture, IL must be configured in an argon-filled glove box.

[0046] A lithium battery was pr...

Embodiment 3

[0048] The ionic liquid of the present embodiment is N-methyl-N-butylpyrrolidine bistrifluoromethanesulfonic acid imide (Pyr 14 TFSI).

[0049] The organic-inorganic composite solid electrolyte was prepared by solution casting method. Dispersion of LiTFSI in Pyr by ultrasound 14 TFSI to obtain 1mmol g -1 Ionic liquid (denoted as IL). The LAGP ceramic powder was ground at 60 °C for 30 min under vacuum. Get 0.1g PVDF powder, then weigh IL 0.1g, LAGP powder 22.5mg, add 0.7g NMP (N-methylpyrrolidone) to the above mixture, stir continuously for 12h, and the rotating speed is 600r / min. The uniform slurry was cast onto a glass plate, and the film was scraped off at a constant speed using a spreader (150 μm). Finally, the film was vacuum-dried at 60°C for 8 hours to remove NMP to obtain an organic-inorganic composite solid electrolyte (denoted as PIL10%). It should be noted that since LiTFSI is sensitive to moisture, IL must be configured in an argon-filled glove box.

[0050] ...

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Abstract

The invention discloses an organic-inorganic composite solid electrolyte film and a preparation method thereof, and a solid lithium metal battery based on the solid electrolyte film. The electrolyte film takes a polymer as a matrix skeleton, the matrix skeleton is filled with an ionic liquid and an inorganic ionic conductor, and the ionic liquid contains a lithium salt. The solid electrolyte filmis obtained by adopting a solution casting method; the preparation method is simple, and the solid electrolyte film has relatively high ionic conductivity (greater than 10<-4> S cm<-1>). Under the condition of room temperature, the current density is controlled to be 0.1 mA cm <-2>, the assembled symmetrical metal lithium battery can stably circulate for 1,350 circles, and the operation time is aslong as 2,700 hours; the assembled Li|LiFePO4 battery has good cycle performance, can stably circulate for 100 circles at 1C, and has specific capacity maintained at 110mAh g <-1> or above.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, in particular to an organic-inorganic solid electrolyte film and a preparation method thereof, and a solid lithium metal battery assembled using the electrolyte film. Background technique [0002] In recent years, the increasing demand for electronic devices, electric vehicles, and large-capacity energy storage systems has prompted the search for lithium batteries with high power / energy density and good safety. Among the currently available battery technologies, lithium-based batteries, such as lithium-ion batteries, are considered to be the most promising due to their relatively high energy density. Conventional lithium batteries usually use organic liquid electrolytes with relatively low ionic resistance. Although they have the advantages of high conductivity and excellent wettability of the electrode surface, they still have disadvantages such as safety problems, short lifespan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/052H01M10/056H01M2300/0065Y02E60/10
Inventor 林秀婧李壮张婷婷储成成刘瑞卿马延文
Owner NANJING UNIV OF POSTS & TELECOMM
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