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Li3PS4 solid electrolyte, solid mixed electrolyte, all-solid-state lithium-sulfur battery and production method thereof

A solid-state electrolyte, lithium-sulfur battery technology, applied in non-aqueous electrolyte batteries, solid electrolytes, lithium batteries, etc., to achieve the effects of improved performance, simple process, and excellent electrical conductivity

Active Publication Date: 2021-02-23
GUANG DONG DONGBOND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ester solvents (dimethyl carbonate and ethyl acetate) or ketone solvents, as a class of important organic solvents containing carbonyl (C=O) groups, are used as a complex formation medium to prepare vulcanization by liquid phase oscillation method solid electrolyte, which has not been reported so far

Method used

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  • Li3PS4 solid electrolyte, solid mixed electrolyte, all-solid-state lithium-sulfur battery and production method thereof
  • Li3PS4 solid electrolyte, solid mixed electrolyte, all-solid-state lithium-sulfur battery and production method thereof
  • Li3PS4 solid electrolyte, solid mixed electrolyte, all-solid-state lithium-sulfur battery and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1 (preparation of Li with DMC as organic solvent 3 P.S. 4 (lithium thiophosphate)):

[0056] Will Li 2 S (0.3827 g), P 2 S 5 (0.6170 g; Li 2 S:P 2 S 5 Molar ratio=3:1), 4 mm zirconia balls (30 g) and DMC (20 ml) were mixed in a 45 mL polypropylene centrifuge tube; shaken at a speed of 1500 rpm for 24 h in a dry Ar atmosphere, the amplitude was about Then, the test tube was sealed and centrifuged at 10,000rpm for 5 minutes, decanted; the solid phase was evacuated at room temperature, and then evacuated at 190°C for 2h at low pressure using a rotary vacuum pump to obtain a white powder product .

Embodiment 2

[0057] Embodiment 2 (preparation of Li with EA as organic solvent 3 P.S. 4 (lithium thiophosphate)):

[0058] Will Li 2 S (0.3827 g), P 2 S 5 (0.6170 g; Li 2 S:P 2 S 5 molar ratio=3:1), 4mm zirconia balls (30g) and EA (20ml) were mixed in a 45mL polypropylene centrifuge tube; shaken at a speed of 1500rpm in a dry Ar atmosphere for 24h, the amplitude was about Then, the test tube was sealed and centrifuged at 10,000rpm for 5 minutes, decanted; the solid phase was evacuated at room temperature, and then evacuated at 160°C for 2h at low pressure using a rotary vacuum pump to obtain a white powder product .

Embodiment 3

[0059] Embodiment 3 (preparation of Li with MPK as organic solvent 3 P.S. 4 (lithium thiophosphate)):

[0060] Will Li 2 S (0.3827 g), P 2 S 5 (0.6170 g; Li 2 S:P 2 S 5 Molar ratio=3:1), 4 mm zirconia balls (30 g) and MPK (20 ml) were mixed in a 45 mL polypropylene centrifuge tube; shaken at a speed of 1500 rpm for 24 h in a dry Ar atmosphere, with an amplitude of approx. Then, the test tube was sealed and centrifuged at 10,000rpm for 5 minutes, decanted; the solid phase was evacuated at room temperature, and then evacuated at 160°C for 2h at low pressure using a rotary vacuum pump to obtain a white powder product .

[0061] The following is the test characterization part:

[0062] (1) Thermogravimetric (TG) analysis

[0063] The TG curves of the samples prepared using MPK, EA and DMC are plotted in the attached figure 2 , where the horizontal axis is temperature (°C), and the vertical axis is weight change (%). At 250 °C, the weight losses of MPK, EA and DMC samp...

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Abstract

The invention discloses a Li3PS4 (lithium thiophosphate) solid electrolyte, a solid mixed electrolyte, an all-solid-state lithium-sulfur battery and a production method thereof. The Li3PS4 (lithium thiophosphate) is prepared by reacting Li2S (lithium sulfide) and P2S5 (phosphorus pentasulfide) in several organic solvents which are used as complex forming media containing carbonyl functional groupsthrough a liquid-phase oscillation method. According to the invention, core problems of lithium dendritic crystal growth, a low coulomb effect and an interface side reaction faced by the mass production of the three solid-state batteries are effectively solved, and the obtained all-solid-state lithium-sulfur battery based on the Li3PS4 (lithium thiophosphate) solid electrolyte has excellent performance; and high energy density of 900 Wh / L, 1000 times or more of charge-discharge cycles and 95% or more of coulombic efficiency can be achieved, and the safety performance is good. A traditional lithium ion battery can be replaced, and the battery is particularly suitable for electric transport vehicles, electric power storage and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to a Li3PS4 (lithium thiophosphate) solid electrolyte material, a solid mixed electrolyte and an all-solid lithium-sulfur battery, belonging to the field of all-solid lithium battery manufacturing. Background technique [0002] All-solid-state lithium-ion batteries (LIBs) are expected to occupy not only the traditional LIBs containing organic solvent electrolytes but also other types of batteries due to their stability and high specific power density. The all-solid-state LIB uses solid-state electrolytes instead of traditional liquid electrolytes. There are two types of solid electrolytes, sulfide-based solid electrolytes and oxide-based solid electrolytes. Sulfide-based solid-state electrolytes are leading the field of application due to their high ionic conductivity and easy formation of particle interfaces. They are usually prepared by conventional planetary ball milling followed by a heating step to obtain crystals with high...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/052
CPCH01M10/052H01M10/0562H01M2300/0068Y02E60/10
Inventor 刘萍
Owner GUANG DONG DONGBOND TECH CO LTD
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