A kind of lithium thionyl chloride battery electrolyte preparation method

A technology for preparing lithium thionyl chloride batteries and electrolytes, which can be applied to electrolytes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of waste, high cost, and many operation steps, and can reduce consumption or blackening degree and reaction time. Short, easy-to-use effects

Active Publication Date: 2017-03-29
武汉孚安特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has too many steps to easily cause the electrolyte to absorb moisture; the amount of lithium sheets used makes the cost high and the preparation process is very unsafe; it takes a long time to feed sulfur dioxide, which is inefficient and easy to cause waste

Method used

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  • A kind of lithium thionyl chloride battery electrolyte preparation method

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Effect test

Embodiment 1

[0018] Take 580g of lithium salt LiAlCl at a dew point of -36°C 4 (lithium salt LiAlCl 4 From LiCl and AlCl 3 Made by melting, the molar ratio of LiCl to AlCl 3 Molar excess of 2%) was added into a 3L round bottom flask, and then 280g of sulfur dioxide was passed into the flask, the purity of sulfur dioxide gas was ≥99.99%, the product was left to stand for 10h, and then the distillate of 4250g of thionyl chloride was slowly added in three times In the round-bottomed flask, the mass ratio of the distillate of thionyl chloride to the lithium salt after the reaction is 5:1, shake well and dissolve, then add 2 lithium slices with a thickness of 0.25mm and a length of 15cm, with a quality of 1.4g (the amount added is lithium Salt LiAlCl 4 0.24% of the mass), and leave it to get the electrolyte.

Embodiment 2

[0020] Take 580g of lithium salt LiAlCl at a dew point of -38°C 4 (lithium salt LiAlCl 4 From LiCl and AlCl 3 Made by melting, the molar ratio of LiCl to AlCl 3 Molar excess of 5%) was added into a 3L round bottom flask, and then 232g of sulfur dioxide was passed into the flask, the purity of sulfur dioxide gas was ≥99.99%, the product was left to stand for 5h, and then the distillate of 2840g of thionyl chloride was slowly added in three times In the round bottom flask, the mass ratio of the distillate of thionyl chloride to the lithium salt after reaction is 3.5:1, shake well and dissolve, then add 2 pieces of 0.25mm thick lithium slices, the quality is 1.45g (the amount added is lithium salt LiAlCl 4 0.25% of the mass), and leave it to get the electrolyte.

Embodiment 3

[0022] Take 580g of lithium salt LiAlCl at a dew point of -36°C 4 (lithium salt LiAlCl 4 From LiCl and AlCl 3 Made by melting, the molar ratio of LiCl to AlCl 3 Molar excess of 3%) was added into a 3L round bottom flask, and then 290g of sulfur dioxide was introduced into the flask, the purity of sulfur dioxide gas was ≥99.99%. In the round bottom flask, the mass ratio of the distillate of thionyl chloride to the lithium salt after reaction is 5:1, shake well and dissolve, then add 2 pieces of 0.25mm thick lithium slices, the quality is 0.87g (the amount added is lithium salt LiAlCl 4 0.15% of the mass), and leave it to get the electrolyte.

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Abstract

A preparing method of an electrolyte of a lithium-thionyl chloride cell is disclosed. The method is characterized by including following steps of: a) weighing a lithium salt LiAlCl4 in a dry environment the dew-point temperature of which is lower than -35 DEG C into a dry container; b) feeding SO2 gas into the lithium salt LiAlCl4, and allowing the mixture to stand for 5-10 h after feeding of the SO2 gas is finished; and c) adding SOCl2 purified by rectification into the lithium salt product obtained after feeding of the SO2 gas is finished, and adding lithium sheets to prepare the electrolyte. The method is short in steps, short in SO2 reaction time, simple in operation, low in lithium sheet consumption amount, low in cost and safe.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing an electrolyte for a lithium thionyl chloride battery. Background technique [0002] Lithium thionyl chloride battery is an electrochemical system power source with lithium metal as the negative electrode, liquid thionyl chloride as the positive electrode active material, and porous carbon as the positive electrode current collector. Among them, SOCl 2 It is both a reaction substance and a non-aqueous inorganic solvent, dissolving LiAlCl 4 The solution after adding additives is an inorganic electrolyte, and the battery of this system is a new type of high-energy chemical power source developed in recent years. The overall reaction mechanism is: 4Li+2SOCl 2 →4LiCl+S+SO 2 , sulfur and sulfur dioxide are dissolved in an excess of thionyl chloride electrolyte, and during discharge, a certain degree of pressure is generated due to the generation of sulfur ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/14
CPCH01M6/14H01M2300/002
Inventor 代江华杨辉
Owner 武汉孚安特科技有限公司
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