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Lithium-sulfur battery

A lithium-sulfur battery, sulfur-based technology, applied in the direction of lithium batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems that hinder the practical application of solid-state electrolytes, low ion conductivity, instability, etc., to overcome the many intermediate products Loss of lithium sulfide, high ionic conductivity, and improved utilization

Active Publication Date: 2013-03-27
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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Problems solved by technology

However, although the advantages of solid-state electrolytes are generally recognized, the low ionic conductivity and unstable chemical and electrochemical properties still hinder the practical application of solid-state electrolytes.

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  • Lithium-sulfur battery

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[0028] Please refer to FIG. 1 , the present invention provides a lithium-sulfur battery 1 with high energy density and long cycle life. A lithium-sulfur battery 1 includes a positive electrode 2 , a negative electrode 4 and an electrolyte 6 disposed between the positive electrode 2 and the negative electrode 4 .

[0029] The positive electrode 2 includes a positive electrode current collector 10 and a positive electrode active material 8 . The positive electrode active material 8 contains sulfur-based materials, and the sulfur-based material accounts for 70-90% of the total weight of the positive electrode active material 8 . In a preferred embodiment, the proportion by weight of the sulfur-based material in the positive electrode active material 8 is 80%.

[0030] Sulfur-based materials are selected from elemental sulfur, Li 2 S n , organosulfides and carbon-sulfur polymers (C 2 S v ) m At least one of, wherein, n≥1, 2.5≤v≤50, m≥2.

[0031] Preferably, the sulfur-based...

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Abstract

The present invention relates to a lithium-sulfur battery, which comprises a positive electrode, a negative electrode and an electrolyte, wherein the positive electrode comprises a positive electrode current collector and a positive electrode active material involved in an electrochemical reaction, the positive electrode active material comprises a thio material, the negative electrode comprises a negative electrode current collector and a negative electrode active material selected from metal lithium, a lithium alloy, lithium-carbon and a silicon base material, a pre-lithium embedding treatment is performed on the positive electrode and / or the negative electrode when the selected thio material and the silicon base material do not contain lithium, and the electrolyte is a solid state electrolyte containing a lithium super-ion conductor material. According to the solid state lithium-sulfur battery, loss of an intermediate product lithium polysulphide during a positive electrode charge and discharge process is avoided, the solid state electrolyte has high ionic conductance so as to improve energy density and cycle life of the lithium-sulfur battery, the packaging process of the lithium-sulfur battery adopting the solid state electrolyte is simpler than the packaging process of the lithium-sulfur battery adopting the liquid state electrolyte, and the lithium-sulfur battery is easy to industrialize.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a solid-state lithium-sulfur battery. Background technique [0002] Large-scale battery production is increasing worldwide as demand for batteries for energy storage and handheld devices increases. Lithium-ion secondary batteries are very attractive in terms of free maintenance of the battery system and high energy density. Rechargeable lithium-sulfur battery with a theoretical capacity of up to 1675mAhg -1 , almost higher than the current commercial cathode LiFePO 4 An order of magnitude of lithium-ion secondary batteries, and sulfur as the positive active material is not only low in cost, non-toxic, but also rich in content. However, there are some problems in lithium-sulfur batteries that hinder its development, such as: the conductivity of sulfur is low, and the lithium polysulfide intermediate product produced during charge and discharge is easily soluble in the organic electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0562
CPCY02E60/122Y02E60/10
Inventor 陈璞卡赞姆·杰迪
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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