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Novel lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, a new type of technology, applied in the manufacture of lithium batteries, electrolyte batteries, battery electrodes, etc., can solve the problems of low interface stability and large interface impedance, improve battery safety and cycle life, and inhibit lithium dendrites The generation and the effect of reducing the interface impedance

Pending Publication Date: 2021-12-07
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low interfacial stability and large interfacial impedance of the electrode / solid-state electrolyte interface including the Li metal anode and the sulfur cathode side are still great challenges for all-solid-state Li-S batteries.

Method used

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  • Novel lithium-sulfur battery and preparation method thereof
  • Novel lithium-sulfur battery and preparation method thereof
  • Novel lithium-sulfur battery and preparation method thereof

Examples

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preparation example Construction

[0035] On the other hand, the present invention also provides a preparation method of a novel lithium-sulfur battery, comprising the following steps:

[0036] Step S1: Making a solid electrolyte

[0037] Step S2: Making a liquid negative electrode

[0038] Step S3: Making a liquid positive electrode

[0039] Step S4: Making the current collector

[0040] Step S5: Press the liquid negative electrode on one side of the solid electrolyte sheet, drop the liquid positive electrode on the other side of the solid electrolyte sheet, cover the liquid positive electrode with the current collector, and assemble the button battery to form the new lithium-sulfur battery.

[0041] The invention solves the problem of low interface stability and large interface impedance of the electrode / solid electrolyte interface of the solid-state lithium-sulfur battery by using the liquid positive electrode and the negative electrode, and improves the capacity and cycle life of the solid-state lithium-s...

Embodiment 1

[0059] (1) Take 70 mg The powder was pressed with a mold with a diameter of 15 mm at a pressure of 80 MPa and held for 2 minutes to obtain a solid electrolyte sheet.

[0060] (2) Take 13 mg of lithium metal, remove the oxide film, cut it into pieces, add 1.487 g of metallic mercury, and let it stand for 48 hours to obtain 1.5 g of liquid lithium amalgam. Put the base material into a mold with a diameter of 15 mm and add liquid lithium amalgam, press it into a tablet at a pressure of 200 MPa, hold the pressure for 3 minutes, and obtain a liquid negative electrode.

[0061] (3) Take 114.8 mg lithium sulfide, 560 mg elemental sulfur, add 10 ml 1 M LiTFSI (DME:DOL=1:1, with 1 wt% LiNO 3 ), ultrasonically dispersed for 30 minutes, and then magnetically stirred for 48 hours to obtain a liquid positive electrode.

[0062] (4) Take 90 mg of conductive graphene and 10 mg of PVDF, add 2 ml of NMP, and stir magnetically for 24 hours. The resulting slurry is coated on aluminum foil, dr...

Embodiment 2

[0065] (1) Take 100 mg The powder was pressed with a mold with a diameter of 15 mm, the pressure was 100 MPa, and the pressure was maintained for 3 minutes to obtain a solid electrolyte sheet.

[0066] (2) Take 26 mg of lithium metal, remove the oxide film, cut it into pieces, add 2.974 g of metallic mercury, and let it stand for 48 hours to obtain 3 g of liquid lithium amalgam. Put the base material into a mold with a diameter of 15 mm and add liquid lithium amalgam, press it into a tablet at a pressure of 300 MPa, and hold the pressure for 5 minutes to obtain a liquid negative electrode.

[0067] (3) Take 229.6 mg lithium sulfide, 1.12 g elemental sulfur, add 20 ml 1 M LiTFSI (DME:DOL=1:1, with 1 wt% LiNO 3 ), ultrasonically dispersed for 30 minutes, and then magnetically stirred for 48 hours to obtain a liquid positive electrode.

[0068] (4) Take 180 mg of conductive graphene and 20 mg of PVDF, add 4 ml of NMP, and stir magnetically for 24 hours. The resulting slurry is...

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Abstract

The invention provides a novel lithium-sulfur battery and a preparation method thereof. The novel lithium-sulfur battery comprises a solid electrolyte, a liquid negative electrode, a liquid positive electrode and a current collector. The solid electrolyte is Li10GeP2S12. The liquid negative electrode is lithium amalgam generated by reaction of metal lithium and metal mercury in proportion; the liquid positive electrode is polysulfide synthesized by lithium sulfide and elemental sulfur; the current collector is an aluminum foil coated with a conductive material. The liquid electrode is used, good interface contact is provided for an electrode / solid electrolyte interface, the interface problem of the solid-state lithium-sulfur battery is solved, the volume expansion of the electrode in the circulation process is effectively relieved, and the coulombic efficiency of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur battery materials, in particular to a novel lithium-sulfur battery and a preparation method thereof. Background technique [0002] With the dramatic increase in the demand for electrochemical energy storage systems in portable electronic devices and electric vehicles, battery technology is playing an important role. Lithium-sulfur (Li-S) batteries are widely used due to their high energy density (2600 Wh kg -1 ), good low-temperature performance, environmental friendliness, and low cost are widely considered as potential substitutes for traditional lithium-ion batteries. However, in conventional liquid electrolyte lithium-sulfur batteries, due to the formation of soluble polysulfide intermediates and their diffusion and shuttling between the cathode and anode, as well as the generation of anode lithium dendrites during cycling and the large volume of the electrodes Changes, limited by low...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M4/40H01M4/38H01M4/62H01M10/058
CPCH01M10/052H01M4/405H01M4/38H01M4/628H01M10/058Y02E60/10Y02P70/50
Inventor 陶涛高雨璇邓超杨盛鸿刘树浩郭锦涛鲁圣国
Owner GUANGDONG UNIV OF TECH
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