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

A technology for lithium polysulfide and lithium sulfur batteries, which is applied in lithium batteries, alkali metal sulfides/polysulfides, sulfur compounds, etc., can solve the problems of increasing the use cost of lithium sulfur batteries, poor stability of vulcanized polymers, and high difficulty.

Active Publication Date: 2016-08-31
TAICANG LIBIAO INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0031] In the reaction kettle for synthesizing lithium polysulfide, after the replacement of inert gas, under the condition that the flow rate of continuously feeding nitrogen is 360ml / min, add 4.4mol of NMP solvent, 1.0mol of sodium hydrosulfide, and 1.03mol of sodium hydroxide and 0.3mol of deionized oxygen-free water, then heated the temperature of the reaction system from room temperature to 66°C, and kept it at this temperature for 33min, then added 1.001mol of lithium chloride, and continued to increase the temperature of the reaction system to 180°C, And under this temperature and condition, make the reaction system keep warm for 33min, when fine white crystals are precipitated in the reaction system, remove the water content in the reaction system by evaporation, stop heating, and filter while hot to remove the sodium chloride generated , the filtrate was returned to the reaction system, and the air in it was replaced with nitrogen, then 4.0mol of sublimed sulfur was ad...

Embodiment 2

[0034] In the reaction kettle for synthesizing lithium polysulfide, after the replacement of inert gas, under the condition that the flow rate of nitrogen gas is continuously fed into 480ml / min, 5.4mol of NMP solvent, 1.0mol of sodium hydrosulfide, and 1.03mol of sodium hydroxide are added and 0.3mol deionized oxygen-free water, then heat the temperature of the reaction system from room temperature to 68°C, and keep it at this temperature for 18 minutes, then add 1.001mol lithium chloride, and continue to increase the temperature of the reaction system to 180°C, And under this temperature and condition, make the reaction system keep warm for 18min, when fine white crystals are precipitated in the reaction system, remove the water content in the reaction system by evaporation, stop heating, and filter while hot to remove the sodium chloride generated , the filtrate was returned to the reaction system, and the air in it was replaced with nitrogen, then 6.0mol of sublimed sulfur w...

Embodiment 3

[0037] In the reaction kettle for synthesizing lithium polysulfide, after the replacement of inert gas, under the condition that the flow rate of nitrogen gas is continuously fed into 380ml / min, add 4.6mol of NMP solvent, 1.0mol of sodium hydrosulfide, and 1.03mol of sodium hydroxide and 0.3mol deionized oxygen-free water, then heat the temperature of the reaction system from room temperature to 67°C, and keep it at this temperature for 21 minutes, then add 1.001mol lithium chloride, and continue to increase the temperature of the reaction system to 163°C, And under this temperature and condition, make the reaction system keep warm for 19min, when fine white crystals are separated out in the reaction system, the water content in the reaction system is evaporated and removed at the same time, and stop heating, filter while hot to remove the sodium chloride that generates , the filtrate was returned to the reaction system, and the air in it was replaced with nitrogen, then 4.5mol...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B17/22
CPCC01B17/34H01M4/5815H01M10/052Y02E60/10
Inventor 宋大余徐晨李波
Owner TAICANG LIBIAO INTELLIGENT TECH CO LTD
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