Metal-sulfur battery electrolyte and metal-sulfur battery containing same

A metal sulfur and electrolyte technology, which is applied in the field of metal sulfur battery electrolyte and metal sulfur battery, can solve the problems affecting the stability of battery cycle performance, the dissolution of positive electrode sulfur, etc., to reduce the shuttle effect, inhibit corrosion, and improve cycle stability. Effect

Pending Publication Date: 2020-09-25
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the lithium-sulfur battery and other metal-sulfur batteries have a positive electrode sulfur dissolution phenomenon that affects the stability of the battery cycle performance, the present invention provides a new metal-sulfur battery electrolyte and a metal-sulfur battery containing the electrolyte.

Method used

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  • Metal-sulfur battery electrolyte and metal-sulfur battery containing same
  • Metal-sulfur battery electrolyte and metal-sulfur battery containing same
  • Metal-sulfur battery electrolyte and metal-sulfur battery containing same

Examples

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Embodiment 1

[0048] This example is used to illustrate the representative metal-sulfur battery electrolyte and metal-sulfur battery of the present invention.

[0049] 1. Preparation of Electrolyte for Metal Sulfur Battery

[0050] 1,3-dioxolane (DOL) and dimethyl carbonate (DMC) were mixed at a volume ratio of 1:1 to form a mixed solvent. Add lithium bisfluorosulfonimide (LiTFSI) to the mixed solvent to a concentration of 1M, and add the above-mentioned structural formula I 1 The indicated compounds to a concentration of 1 wt% and the addition of LiNO 3 To the concentration of 1wt%, stir evenly, obtain and comprise 1:1DOL:DME+1MLiTFSI+1wt% structural formula I 1 Compounds shown + 1wt% LiNO 3 The metal-sulfur battery electrolyte is shown in Table 1.

[0051] 2. Fabrication of metal-sulfur batteries

[0052] (1) Preparation of positive electrode

[0053] Mix elemental sulfur and Ketjen black at a mass ratio of 1:3, and heat at 155°C for 12 hours. During the heating process, due to the ...

Embodiment 2-24

[0057] Examples 2-24 are used to illustrate other metal-sulfur battery electrolytes and metal-sulfur batteries of the present invention, and their preparation is similar to the preparation method of the metal-sulfur battery electrolyte and metal-sulfur batteries in Example 1. The components and contents shown in 1 were used to prepare metal-sulfur battery electrolyte, and the metal-sulfur battery was prepared using the prepared metal-sulfur battery electrolyte, the positive electrode obtained in Example 1, the negative electrode shown in Table 1, and the celgard2325 type diaphragm ( lithium-sulfur battery, potassium-sulfur battery or sodium-sulfur battery).

Embodiment 2

[0071] Embodiment 2 (sodium-sulfur battery, containing 1M NaTFSI sodium salt) and embodiment 3 (potassium-sulfur battery, containing 1M KTFSI potassium salt) add 1wt% of the compound shown in structural formula I to the electrolyte solution containing 1:1DOL / DME solvent , while Comparative Example 2 (sodium-sulfur battery, containing 1M NaTFSI sodium salt) and Comparative Example 3 (potassium-sulfur battery, containing 1M KTFSI potassium salt) did not add 1wt% of the compound shown in structural formula I in the corresponding electrolyte. Comparing the test results of Example 2-3 and Comparative Example 2-3, it can be seen that after the sodium-sulfur battery of Example 2 and the potassium-sulfur battery of Example 3 cycled 200 and 450 times at 0.5C and 230 times at 2C, The battery capacity is better than the sodium-sulfur battery of Comparative Example 2 and the potassium-sulfur battery of Comparative Example 3, indicating that the compound shown in structural formula I can im...

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Abstract

The present invention provides a metal sulfur battery electrolyte, which comprises a non-aqueous organic solvent, a metal salt, a first additive and a second additive. The first additive is LiNO3, andthe second additive comprises one or a plurality of compounds represented by structural formulas I-IV. The invention also provides a metal-sulfur battery, especially a lithium-sulfur battery, containing the metal-sulfur battery electrolyte. The first additive is used for protecting the metal cathode; the coulombic efficiency of the battery is improved. The second additive compound is reduced anddecomposed on the surface of the positive electrode of the battery to form a layer of positive electrode-electrolyte interface (CEI) film in the use process of the battery. The CEI membrane can effectively isolate contact between lithium polysulfide (Li2Sn, 3 < = n < = 8) generated by a battery positive electrode and an electrolyte, limit dissolution of lithium polysulfide in the electrolyte, reduce the shuttle effect of lithium polysulfide on a diaphragm and inhibit corrosion of shuttle lithium polysulfide to a lithium negative electrode, thereby improving the cycle stability of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a metal-sulfur battery electrolyte and a metal-sulfur battery containing the electrolyte. Background technique [0002] At present, human beings are facing the problems of increasingly severe energy shortage and continuous deterioration of environmental pollution. In order to achieve sustainable development, the utilization and development of new energy and renewable energy has become a research hotspot around the world, and water energy, wind energy, hydrogen energy, nuclear energy, tidal energy, and solar energy have all been vigorously developed and utilized. The improvement of the performance of energy storage devices has effectively promoted the popularization of new energy applications. Among various energy storage methods, electrochemical energy storage has become one of the important research directions around the world due to its high energy density, good energy conve...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052H01M10/054
CPCH01M10/0567H01M10/052H01M10/054H01M2300/0025Y02E60/10
Inventor 邓永红肖映林李阳阳翟浩宇
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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