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Lithium-sulfur battery electrolyte, lithium-sulfur battery and activation method of lithium-sulfur battery

A technology of lithium-sulfur battery and activation method, which is applied in the field of lithium-sulfur battery electrolyte, lithium-sulfur battery and its activation, and can solve problems such as short cycle life

Pending Publication Date: 2022-06-28
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the present application provides a lithium-sulfur battery electrolyte, a lithium-sulfur battery and an activation method thereof, to solve the technical problem of short cycle life of the existing lithium-sulfur battery

Method used

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  • Lithium-sulfur battery electrolyte, lithium-sulfur battery and activation method of lithium-sulfur battery
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  • Lithium-sulfur battery electrolyte, lithium-sulfur battery and activation method of lithium-sulfur battery

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preparation example Construction

[0048] In some embodiments, the preparation method of a lithium-sulfur battery electrolyte includes the following steps: under the protection of an inert gas, adding a lithium salt to a solvent, then adding a nitrate additive, and fully stirring to obtain a lithium-sulfur battery electrolyte. Optionally, the inert gas is at least one of nitrogen, helium and argon; the water content in the inert gas is less than 0.1 ppm, and the oxygen content is less than 0.1 ppm.

[0049] An embodiment of the second aspect of the present application provides a lithium-sulfur battery, the lithium-sulfur battery includes the lithium-sulfur battery electrolyte, a positive electrode, and a negative electrode in any of the foregoing embodiments.

[0050] According to the embodiment of the present invention, the lithium-sulfur battery includes the above-mentioned newly prepared lithium-sulfur battery electrolyte, and the nitrate additive in the electrolyte can generate a solid-state electrolyte inte...

Embodiment 1

[0086] The solid electrolyte interface film components on the lithium metal negative electrode after the lithium-sulfur battery cycle of Example 1 were analyzed by X-ray photoelectron spectroscopy, as shown in Image 6 As shown, the solid electrolyte interface film of Example 1 is rich in nitrogen oxides LiN x O y , which can effectively shield the side reactions of polysulfides and lithium metal anodes.

[0087] Figure 7 The electron microscope image of the lithium deposition morphology of Example 1 of the present application is shown; Figure 8 The electron microscope image of the lithium deposition morphology of Comparative Example 1 of the present application is shown.

[0088] like Figure 7 and Figure 8 As shown, the oxynitride in the solid electrolyte interface film is beneficial to the uniform transport of lithium ions, making the lithium deposition morphology of Example 1 more uniform, while that of Comparative Example 1 is not uniform.

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Abstract

The invention discloses a lithium-sulfur battery electrolyte, a lithium-sulfur battery and an activation method of the lithium-sulfur battery, the lithium-sulfur battery electrolyte comprises a solvent, a lithium salt and a nitrate ester additive, and the nitrate ester additive is ester of nitric acid and alcohol containing at least four carbon atoms; in the electrolyte, the mass concentration of the nitrate additive is 1.0%-8.0%, and the molar concentration of the lithium salt is 0.2 mol / L-2. 0mol / L. According to the lithium-sulfur battery electrolyte provided by the invention, the nitrate additive can generate a solid electrolyte interface rich in nitrogen oxide on the surface of a metal lithium negative electrode, so that parasitic reaction of polysulfide and the metal lithium negative electrode is inhibited, the lithium deposition and separation uniformity is improved, and the cycle life of a lithium-sulfur battery is further prolonged.

Description

technical field [0001] The present application belongs to the technical field of rechargeable and dischargeable high specific energy secondary batteries, and in particular relates to a lithium-sulfur battery electrolyte, a lithium-sulfur battery and an activation method thereof. Background technique [0002] In order to achieve the goal of carbon peaking and carbon neutrality, it is necessary to vigorously develop renewable energy. In the process of developing renewable energy, the use of energy storage devices can realize the storage and conversion of intermittent renewable energy. At this stage, energy storage devices are usually selected from lithium-ion batteries. Compared with traditional lithium-ion batteries, lithium-sulfur batteries have extremely high theoretical energy density (2600Wh / kg) and practical energy density (>500Wh / kg), and are very promising next-generation secondary battery systems. However, the short cycle life of lithium-sulfur batteries is a bot...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/056
CPCH01M10/0567H01M10/0525H01M10/056
Inventor 张强侯立鹏张学强谢瑾
Owner TSINGHUA UNIV
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