Process for manufacturing lithium polysulfide needed by 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] Lithium-sulfur batteries are more mainstream than iron phosphate in the current market lithium battery Compared with it, it 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, while the Lithium iron phosphate battery The energy density of most of them is 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 ot...

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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