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Transition metal sulfide composite electrode material and preparation method thereof and fully-solid-state lithium battery

A transition metal, composite electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the decline of the overall performance of the battery

Inactive Publication Date: 2018-11-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, when the oxide electrode material is in contact with the sulfide solid electrolyte, a high-resistance space charge layer will be generated at the interface, which will reduce the overall performance of the battery.

Method used

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  • Transition metal sulfide composite electrode material and preparation method thereof and fully-solid-state lithium battery
  • Transition metal sulfide composite electrode material and preparation method thereof and fully-solid-state lithium battery

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[0055] The present invention provides a method for preparing a transition metal sulfide composite electrode material described in the above technical solution, comprising the following steps:

[0056] Mix transition metal sulfides and anhydrous organic solvents and stir to obtain a suspension; the transition metal sulfides are selected from iron-based polysulfides, cobalt-based polysulfides, nickel-based polysulfides and vanadium-based polysulfides one or more of

[0057]Mix the solid electrolyte raw material and the suspension, conduct a precipitation reaction under sealed conditions, distill under reduced pressure, and dry to obtain a precursor; the solid electrolyte raw material is selected from a mixture including lithium sulfide and phosphorus pentasulfide; or Li 10 GeP 2 S 12 Ternary electrolyte;

[0058] The precursor is annealed to obtain a transition metal sulfide composite electrode material.

[0059] The invention adopts a precipitation method to obtain a transi...

Embodiment 1

[0071] 4mmol FeSO 4 ·7H 2 O was added to 40mL N,N-dimethylformamide and 30mL ethylene glycol mixed solvent, stirred at room temperature for 1.0h until completely dissolved to obtain a mixed solution; then urea was added to the above mixed solvent and stirred magnetically for 0.5h. Finally, under the protection of argon atmosphere, 20 mmol of sublimed sulfur was added to it, and reacted in a three-necked flask at 180 ° C for 8 h, the black precipitate was washed by centrifugation, and after freeze-drying at -40 ° C for 24 h, the iron disulfide electrode material was obtained;

[0072] Add 0.5g of iron disulfide prepared above into 20mL of anhydrous acetonitrile, then weigh lithium sulfide and phosphorus pentasulfide into the above solution according to the molar ratio of 7:3, stir evenly at room temperature and transfer to the reactor to seal; React in an oil bath at 50°C for 24h; evaporate the remaining solvent under reduced pressure, and dry in an inert atmosphere; anneal th...

Embodiment 2

[0075] 0.1mmol of Co(NO 3 ) 2 ·6H 2 O and 0.5 mmol thioacetamide were simultaneously added to a mixed solvent of 40 mL of absolute ethanol and 40 mL of deionized water, and magnetically stirred at room temperature for 1.0 h until uniformly mixed. Then transfer it to a reaction kettle for 12 hours at 160°C. After cooling down to room temperature naturally, the black precipitate was centrifuged and washed, and freeze-dried for 24 hours to obtain a cobalt disulfide electrode material whose microscopic morphology is a cobalt disulfide electrode material of nanoparticles;

[0076] Add the 0.5g cobalt disulfide prepared above into 20mL tetrahydrofuran, then weigh lithium sulfide and phosphorus pentasulfide according to the molar ratio of 3:1 and add them to the above solution, stir evenly at room temperature and transfer to the reactor to seal; React in an oil bath at 50°C for 24h, then evaporate the remaining solvent under reduced pressure, and dry in an inert atmosphere; finally...

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Abstract

The invention provides a transition metal sulfide composite electrode material and a preparation method thereof and a fully-solid-state lithium battery. The composite electrode material includes a transition metal sulfide and a solid electrolyte coating the transition metal sulfide; the transition metal sulfide is selected from one or more of iron-based polysulfide, cobalt-based polysulfide, nickel-based polysulfide and vanadium-based polysulfide; the solid electrolyte is selected from Li7P3S11, Li3PS4, Li10GeP2S12, 70% Li2S.29% P2S5.1% Li3PO4, 75% Li2S.24% P2S5.1% P2O5 and 80% Li2S.20% P2S5.The fully-solid-state lithium battery prepared from the composite electrode material has good cycle performance, high energy density and high rate performance.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to a transition metal sulfide composite electrode material, a preparation method thereof, and an all-solid lithium battery. Background technique [0002] With the need for higher energy density energy storage devices, lithium-ion batteries are considered to be one of the technologies most likely to fulfill the needs of electric vehicles and large-scale energy storage. Although lithium-ion batteries have the highest energy density among currently commercialized secondary batteries, they still cannot meet the growing demand for higher energy densities. At the same time, traditional lithium-ion batteries use combustible organic electrolytes as the conductive medium, and there are dangers of leakage, combustion and explosion, which limits the promotion and application of lithium-ion batteries in certain fields. Lithium metal has the lowest potential and ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/62H01M10/0525Y02E60/10
Inventor 姚霞银张强让·皮埃尔·麦克韦泽瓦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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