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A kind of lithium secondary battery solid electrolyte composite material, preparation method and lithium secondary battery

A lithium secondary battery and solid-state electrolyte technology, applied in the field of material chemistry, can solve problems such as high energy consumption and complicated preparation process, and achieve high ion conductivity, simple preparation process, and cheap and easy-to-obtain raw materials

Active Publication Date: 2020-07-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned method has the problems of complicated preparation process and high energy consumption.

Method used

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  • A kind of lithium secondary battery solid electrolyte composite material, preparation method and lithium secondary battery
  • A kind of lithium secondary battery solid electrolyte composite material, preparation method and lithium secondary battery
  • A kind of lithium secondary battery solid electrolyte composite material, preparation method and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh the raw materials lithium hydroxide, lanthanum oxide and zirconia according to the stoichiometric molar ratio (14:3:4), then use isopropanol as the ball milling solvent and zirconia balls as the ball milling medium for 12 hours, and dry to obtain a uniform mixture. raw materials. Then the raw material after ball milling was put into a tubular atmosphere furnace, calcined at 800°C for 12 hours and then cooled naturally; the calcined sample was taken out and pressed into a disc with a diameter of 13.5 mm by a manual dry press molding machine. The pressure used is 2-4 MPa, and the holding time is 2-3 minutes. The pellets were placed in a porcelain boat and calcined in a tubular atmosphere furnace at 1200 °C in air for 36 hours, and then cooled naturally to prepare garnet-type Li 7 La 3 Zr 2 o 12 .

[0047] Prepare 1M PbBr 2 N,N-dimethylformamide (DMF) solution and 0.07 M CsBr in methanol solution, 40 μl of PbBr 2 The solution was spin-coated on a piece of 500m...

Embodiment 2

[0053]The raw materials lithium hydroxide, lanthanum oxide and zirconium oxide are according to the stoichiometric molar ratio (14:3:4), and then use isopropanol as the ball milling solvent, and the zirconia balls are used as the ball milling medium for ball milling for 12 hours, and then dry to obtain a uniformly mixed raw material . Then the raw material after ball milling was put into a tubular atmosphere furnace, calcined at 800°C for 12 hours and then cooled naturally; the calcined sample was taken out and pressed into a disc with a diameter of 13.5 mm by a manual dry press molding machine. The pressure used is 2-4 MPa, and the holding time is 2-3 minutes. The pellets were calcined in a porcelain boat at 1200 °C in air for 36 hours, and then cooled naturally to prepare garnet-type Li 7 La 3 Zr 2 o 12 .

[0054] Weigh the same molar amount of PbBr 2 and CsBr powder dissolved in DMF to obtain 0.48M concentration of CsPbBr 3 DMF solution. Then, to 1mL CsPbBr 3 Add 3...

Embodiment 3

[0060] Weigh the raw materials lithium hydroxide, lanthanum oxide and zirconia according to the stoichiometric molar ratio (14:3:4), then use isopropanol as the ball milling solvent and zirconia balls as the ball milling medium for 12 hours, and dry to obtain a uniform mixture. raw materials. Then the raw material after ball milling was put into a tubular atmosphere furnace, calcined at 800°C for 12 hours and then cooled naturally; the calcined sample was taken out and pressed into a disc with a diameter of 13.5 mm by a manual dry press molding machine. The pressure used is 2-4 MPa, and the holding time is 2-3 minutes. The pellets were placed in a porcelain boat and calcined in a tubular atmosphere furnace at 1200 °C in air for 36 hours, and then cooled naturally to prepare garnet-type Li 7 La 3 Zr 2 o 12 .

[0061] Prepare 1M PbBr 2 N,N-dimethylformamide (DMF) solution and 0.07 M CsBr in methanol solution, 40 μl of PbBr 2 The solution was spin-coated on a piece of 500m...

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Abstract

The invention relates to a lithium secondary battery solid electrolyte composite material, a preparation method and the lithium secondary battery, belonging to the field of material chemistry. The material is a double-layer or triple-layer structure, and one layer is Li in the double-layer structure. 7 La 3 Zr 2 o 12 , another layer is CsPbBr 3 ; The middle layer is Li in a three-layer structure 7 La 3 Zr 2 o 12 , there is a layer of CsPbBr above and below the middle layer 3 . The material is prepared by a spin coating method, and the material is used as a solid electrolyte in a lithium secondary battery, which can improve the interface contact between the solid electrolyte and the metal lithium negative electrode, reduce the interface resistance, increase the capacity of the battery, and improve the cycle performance of the battery .

Description

technical field [0001] The invention relates to a lithium secondary battery solid electrolyte composite material, a preparation method and the lithium secondary battery, belonging to the field of material chemistry. Background technique [0002] Garnet-type solid electrolyte Li 7 La 3 Zr 2 o 12 Due to its high ionic conductivity (1×10 at room temperature - 3 mS·cm -1 ), good chemical stability, sufficiently wide electrochemical window and other characteristics, it is widely used as electrolyte material for solid-state secondary lithium-ion batteries. However, the garnet-type solid electrolyte Li 7 La 3 Zr 2 o 12 The poor interface contact between the material and the lithium metal anode leads to a large interface resistance. Recently, a team led by Professor Hu Liangbing from the University of Maryland in the United States successfully improved the garnet-type solid electrolyte Li 7 La 2.75 Ca 0.25 Zr 1.75 Nb 0.25 o 12 The wettability and chemical stability ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/058H01M2300/0068H01M2300/0071H01M2300/008Y02E60/10Y02P70/50
Inventor 陈棋李煜璟吴佳锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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