Lithium-sulfur battery and preparation method thereof

Abstract

The invention discloses a novel lithium-sulfur battery and a preparation method thereof. The novel lithium-sulfur battery comprises an anode, an electrolytic solution and a lithium-containing cathode, wherein the electrolytic solution comprises a solvent and an electrolyte, the anode preferably adopts a sulfur-free porous electrode, the electrolytic solution also contains sulfur and / or sulfide, and the electrolyte comprises a lithium salt. The preparation method comprises the steps of: respectively preparing the anode, the electrolytic solution and the lithium-containing cathode and assembling the anode, the electrolytic solution and the lithium-containing cathode into a novel lithium-sulfur battery. According to the simple novel lithium-sulfur battery provided by the invention, the complex preparation process of the sulfur anode is avoided, the process cost is reduced, and the problems of difficulty in exerting the capacity due to non-uniform distribution of an active substance sulfur in the conventional sulfur anode material, low sulfur utilization rate, instable performance of the battery, and the like can also be avoided.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a lithium-sulfur battery and a preparation method thereof. technical background [0002] Lithium-sulfur batteries have attracted the attention of researchers due to their incomparably high specific capacity and energy density, low price of materials, and large storage capacity. Especially in recent years, the research on lithium-sulfur batteries at home and abroad has been quite active. , the technological breakthrough has reached the stage of practical application. In traditional Li / S batteries, the active material sulfur or sulfide is fixed on the positive electrode, assuming that the sulfur in the positive electrode reacts completely to form Li 2 S, the theoretical specific capacity that can be released is 1672mAh / g, and the theoretical specific energy is 2600Wh / Kg, which is an order of magnitude higher than the current commercial metal oxide and other positive electrode materials. It can...

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Problems solved by technology

However, the above-mentioned technologies are all centered on the synthesis of sulfur-containing composite cathodes, through complex synthesis methods, expensive raw materials and high-end technologies in order to obtain better performance, but because the loss of active materials cannot be completely avoided, the cycle performance still exists. insufficient