Iron-based sulfide electrode material, preparation method and application in solid state battery

An electrode material, solid-state battery technology, applied in nanotechnology for materials and surface science, iron sulfide, battery electrodes, etc. The effect of electrochemical reaction kinetics

Active Publication Date: 2017-05-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, complex and time-consuming solvothermal and hydrothermal methods are usually used to synthesize transition metal sulfide electrode materials with certain microscopic morphology.

Method used

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  • Iron-based sulfide electrode material, preparation method and application in solid state battery
  • Iron-based sulfide electrode material, preparation method and application in solid state battery

Examples

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preparation example Construction

[0021] The embodiment of the present invention discloses a method for preparing a composite polymer electrolyte, comprising the following steps:

[0022] A) adding the ferrous salt solution to the polyvinyl alcohol aqueous solution, stirring to obtain a mixed solution; under the protection of an inert atmosphere, stirring and mixing the above mixed solution with the sodium sulfide aqueous solution, and obtaining a black precipitate after the reaction;

[0023] B) drying the black precipitate after centrifugal washing to obtain the final iron-based sulfide electrode material;

[0024] This application adopts the method of co-precipitation assisted by polyvinyl alcohol to prepare iron-based sulfide electrode materials, that is, the present invention adopts the method of co-precipitation preparation to obtain iron-based sulfide electrodes with a nanoflower structure composed of nanosheets and good cycle stability Material. The preparation method of the iron-based sulfide electro...

Embodiment 1

[0033] FeSO 4 ·7H 2 O aqueous solution was added to the aqueous solution of 1.0wt% polyvinyl alcohol 1750 with a concentration of 1.0wt%, and after stirring at room temperature for 0.5h, a mixed solution was obtained; then, under the protection of an argon atmosphere, the mixed solution was added to a concentration of 20wt% Na 2 S·9H 2 O aqueous solution, reacted at room temperature for 0.5 h, centrifuged to wash the black precipitate, and freeze-dried for 24 h to obtain the iron-based sulfide electrode material. Iron-based sulfide electrode materials with microscopic morphology of two-dimensional nanosheets such as figure 1 shown.

[0034] With Li 10 GeP 2 S 12 -75Li 2 S·25P 2 S 5 · 1%P 2 o 5 The double-layer solid electrolyte is used as a conductive medium, and metal lithium is used as a counter electrode to assemble a solid-state battery, and the electrochemical performance test is performed at room temperature. figure 2 The middle curve is the cycle performanc...

Embodiment 2

[0036] FeSO 4 ·7H 2 The O aqueous solution was added to the aqueous solution of 0.5wt% polyvinyl alcohol 1799, and stirred at room temperature for 0.5h to obtain a mixed solution; then, under the protection of an argon atmosphere, the mixed solution was added to a concentration of 5wt% Na 2 S·9H 2 In O aqueous solution, react at room temperature for 0.5 h, centrifuge to wash the black precipitate, and vacuum dry at 80 ° C for 24 h to obtain the iron-based sulfide electrode material. The microscopic morphology is an iron-based sulfide electrode material in the shape of two-dimensional nanosheets.

[0037] With Li 10 GeP 2 S 12 -70Li 2 S·30P 2 S 5 The double-layer solid electrolyte is used as a conductive medium, and metal lithium is used as a counter electrode to assemble a solid-state battery, and the electrochemical performance test is performed at room temperature. The iron-based sulfide electrode material prepared in Example 2 was used to assemble a solid-state bat...

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Abstract

The invention provides an iron-based sulfide electrode material, a preparation method and application in a solid state battery, and belongs to the technical field of secondary lithium batteries. The iron-based sulfide electrode material which is based on conversion reaction is selected from one or more of ferrous sulfide, ferriferous sulfide and hepta-ferous octa-sulfide. The preparation method of the iron-based sulfide electrode material has the advantages of being simple and short in time.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and relates to an iron-based sulfide electrode material, a preparation method and its application in solid-state batteries. Background technique [0002] Due to the advantages of high energy density, high discharge voltage, long cycle life and no memory effect, lithium-ion batteries have been widely used in consumer electronics and communications. In the future, they will have broad applications in the fields of hybrid electric vehicles and large-scale energy storage. Prospects. However, traditional lithium-ion batteries usually use organic electrolyte as the lithium-ion conductive medium, which has safety problems such as flammability, corrosion, and poor thermal stability, which limits the application of lithium-ion batteries. At the same time, metal lithium will undergo a series of side reactions with the liquid electrolyte in the liquid battery. For example, a chemical re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M10/0562C01G49/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G49/12H01M4/5815H01M10/0525H01M10/0562H01M2300/0085Y02E60/10
Inventor 许晓雄张强姚霞银
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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