A kind of electrode material for solid-state lithium-sulfur battery at room temperature and its preparation method and solid-state lithium-sulfur battery

An electrode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as reducing electrochemical reaction kinetics, increasing local stress/strain and interface resistance, and improving electrochemical reaction kinetics. The effect of improving electrochemical performance and long cycle life

Active Publication Date: 2021-08-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

However, the use of solid electrolytes for solid-state batteries increases local stress / strain and interfacial resistance, reducing electrochemical reaction kinetics

Method used

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  • A kind of electrode material for solid-state lithium-sulfur battery at room temperature and its preparation method and solid-state lithium-sulfur battery
  • A kind of electrode material for solid-state lithium-sulfur battery at room temperature and its preparation method and solid-state lithium-sulfur battery
  • A kind of electrode material for solid-state lithium-sulfur battery at room temperature and its preparation method and solid-state lithium-sulfur battery

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preparation example Construction

[0030] The present invention also provides a preparation method of the electrode material for the above-mentioned solid-state lithium-sulfur battery, comprising the following steps:

[0031] A) ball milling the transition metal sulfide and sulfur to obtain the mixture;

[0032] B) reacting the mixture under high temperature and high pressure conditions to obtain an electrode material for a solid lithium-sulfur battery.

[0033] In the present invention, the transition metal sulfide and sulfur are firstly mixed, and the present invention has no special limitation on the mixing method of the two, and manual grinding and mixing are preferred. Next, ball milling is performed. Wherein, the rotational speed of the ball mill is 100-400 rpm, preferably 200-300 rpm; the time is 1-36 h, preferably 2-30 h.

[0034] The mass ratio of the transition metal sulfide to sulfur is (0.01-10):(0.01-10), preferably (0.1-1):(0.1-1).

[0035] After the mixture is obtained, the mixture is reacted ...

Embodiment 1

[0045] 4 mmol FeSO 4 ·7H 2 O was added to 40 mL of N,N-dimethylformamide and 30 mL of ethylene glycol mixed solvent, stirred at room temperature for 1.0 h until completely dissolved, and a mixed solution was obtained; then 40 mmol of urea was added to the above mixed solvent and stirred magnetically for a period of time. Finally, under the protection of argon atmosphere, 20 mmol of sublimed sulfur was added therein, and reacted in a three-necked flask at 180° C. for 8 h. The black precipitate was washed by centrifugation and freeze-dried for 24 hours to obtain iron disulfide.

[0046] It is determined that the size of the iron disulfide is 100 nm-10 μm, and its microscopic appearance is spherical.

[0047] Then 100 mg of iron disulfide and 100 mg of elemental sulfur were manually ground and mixed, then ball milled and mixed at a speed of 500 rpm for 12 hours, and then reacted at 155° C. for 12 hours to obtain a composite electrode material of iron disulfide and elemental sul...

Embodiment 2

[0053] 1g Na 3 VO 4 Completely dissolve in 70mL of deionized water, stir magnetically for 2h, add 2g of thioacetamide and continue stirring until completely dissolved. Then transfer to a 100mL hydrothermal reaction kettle to react at 160°C for 24h, finally centrifuge washing, and freeze-drying to obtain vanadium tetrasulfide.

[0054] It is determined that the size of the vanadium tetrasulfide is 100 nm to 10 μm, and its microscopic appearance is spherical.

[0055] Then 100 mg of vanadium tetrasulfide and 100 mg of sublimed sulfur were manually ground and mixed, then ball milled and mixed for 12 hours at a speed of 500 rpm, and then reacted at 155 °C for 12 hours under airtight conditions to obtain a composite of vanadium tetrasulfide and elemental sulfur electrode material.

[0056] The electrode material prepared above was mixed with Li 10 GeP 2 S 12 The solid electrolyte and super P were manually ground for 0.5h according to the mass ratio of 45:50:5 to prepare the p...

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Abstract

The invention provides an electrode material for a room-temperature solid-state lithium-sulfur battery, which is formed by compounding transition metal sulfide and sulfur. The electrode material provided by the present invention can satisfy the use of room temperature solid-state lithium-sulfur batteries, and can improve the electrochemical performance of room-temperature solid-state lithium-sulfur batteries. To solve the problem of poor performance, improve the electrochemical reaction kinetics, so that the solid-state lithium-sulfur battery can work normally at room temperature. On the other hand, transition metal sulfide electrode materials can be combined with elemental sulfur through material design, which can improve the structural stability of active materials and solve the large volume change of elemental sulfur during cycling, thereby effectively improving the cycle stability of solid-state lithium-sulfur batteries. . Therefore, the composite electrode material of transition metal sulfide and elemental sulfur provided by the present invention has higher discharge specific capacity and longer cycle life.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium-sulfur batteries, and in particular relates to an electrode material for a room-temperature solid-state lithium-sulfur battery, a preparation method thereof, and a solid-state lithium-sulfur battery. Background technique [0002] Due to the advantages of high energy density, long cycle life and no memory effect, lithium-ion batteries have been widely used in energy storage fields such as portable electronic products and communications, and have broad development prospects in the fields of power vehicles and smart grids in the future. However, traditional lithium-ion batteries usually use organic electrolyte as the lithium-ion conductive medium, which has safety problems such as flammability, leakage, and explosion, which limit the application of lithium-ion batteries. At the same time, traditional lithium-ion batteries use lithium-containing transition metal oxides or phosphate electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/0525
CPCH01M4/362H01M4/386H01M4/5815H01M10/0525Y02E60/10
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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