A kind of manufacturing process of lithium polysulfide required for lithium-sulfur battery

Abstract

The invention discloses a process for manufacturing lithium polysulfide needed by a lithium sulfur battery. The process comprises the following steps: replacing with inert gases in a reaction kettle, and synthesizing through N-methyl pyrrolidone, sodium bisulfide, sodium hydroxide, oxygen-free deionized water, lithium chloride and sublimed sulfur according to a molar ratio of (4.4-5.4) to 1.0 to 1.03 to 0.3 to 1.001 to (4.0-6.0) according to a formula of raw materials; heating, filtering to remove generated sodium chloride, returning the filtrate to a reaction system, adding sublimed sulfur, heating the reaction system, and reducing the preserved temperature to room temperature, thereby separating out light yellow white solid powder in the reaction system; filtering the light yellow white solid precipitates, washing and filtering by anhydrous alcohol, and drying in a drying oven, thereby obtaining a lithium polysulfide raw material needed by the lithium sulfur battery.

Description

technical field [0001] The invention belongs to the field of new chemical materials, in particular to the preparation of raw material lithium sulfide used in the production of lithium-sulfur batteries. technical background [0002] Compared with the mainstream lithium iron phosphate battery in the market, lithium-sulfur battery has many obvious advantages. In theory, the energy density of lithium-sulfur batteries far exceeds that of most types of power batteries. What is certain is that its maximum energy density will not be lower than 1000 Wh / kg in theory, while the energy density of lithium iron phosphate batteries is mostly below 100 Wh / kg, and there is not much room for improvement. Obviously, from the perspective of energy storage efficiency alone, lithium-sulfur batteries are more suitable as automotive power batteries and / or other power batteries. [0003] In addition to very high energy density, lithium-sulfur batteries also have some other advantages. On the one h...

AI Technical Summary

Problems solved by technology

Because vulcanized polymers have relatively poor stability, the current cycle times of lithium-sulfur batteries are much lower than that of ordinary lithium iron phosphate batteries, which greatly increases the cost of lithium-sulfur batteries.

It can be said that as long as this performance disadvantage of lithium-sulfur batteries is not changed, it will be difficult to promote their use on a large scale.

[0005] Although the performance of lithium-sulfur batteries will be very advanced in theory, it is very difficult to turn the theory into a real product

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