Lithium secondary battery, solid electrolyte composite material for same and method for preparing solid electrolyte composite material

A solid electrolyte and lithium secondary battery technology, applied in the field of material chemistry, can solve the problems of complex preparation process and high energy consumption, and achieve the effects of simple preparation process, high ion conductivity, and broad application prospects

Active Publication Date: 2019-02-19
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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  • Lithium secondary battery, solid electrolyte composite material for same and method for preparing solid electrolyte composite material
  • Lithium secondary battery, solid electrolyte composite material for same and method for preparing solid electrolyte composite material
  • Lithium secondary battery, solid electrolyte composite material for same and method for preparing solid electrolyte composite material

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, a solid electrolyte composite material for the same and a method for preparing the solid electrolyte composite material, and belongs to the fieldof material chemistry. The solid electrolyte composite material is of a double-layer or three-layer structure. The solid electrolyte composite material comprises a layer of Li<7>La<3>Zr<2>O<12> and alayer of CsPbBr<3> when the solid electrolyte composite material is of the double-layer structure. The solid electrolyte composite material comprises an intermediate layer of Li<7>La<3>Zr<2>O<12> whenthe solid electrolyte composite material is of the three-layer structure, and two layers of CsPbBr<3> are arranged on the upper side and the lower side of the intermediate layer. The solid electrolyte composite material is prepared by the aid of spin-coating processes. The lithium secondary battery, the solid electrolyte composite material and the method have the advantages that the solid electrolyte composite material can be used as a solid electrolyte to be applied to the lithium secondary battery, accordingly, interface contact of the solid electrolyte and metal lithium negative electrodescan be improved, interface resistance can be lowered, the capacity of the battery can be enhanced, and the cycle performance of the battery can be improved.

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 Applications(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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