Manufacturing method for lithium thionyl chloride battery electrolyte

A lithium thionyl chloride battery and a production method technology, which are applied to secondary batteries, circuits, electrical components, etc., can solve problems such as voltage hysteresis, and achieve the effects of improving voltage hysteresis and increasing content

Active Publication Date: 2016-11-16
湖北艾超特新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This passivation film is beneficial to prolong the storage life of the battery, but it will cause a voltage hysteresis at the beginning of the discharge. After the battery has been stored for a long time at high temperature, the voltage hysteresis phenomenon is particularly obvious when it is discharged in a low temperature environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of lithium thionyl chloride battery electrolyte, comprising the following specific steps:

[0019] a. Get the lithium salt LiAlCl4 and place it in a dry container, and SOCl2 is rectified and purified;

[0020] b. Pass SO2 gas into the lithium salt LiAlCl4, and let it stand for 15 hours after passing SO2;

[0021] c. Pass an appropriate amount of water vapor into BrCl, and get HCl and HBrO after full reaction;

[0022] d. Add the SOCl2, HCl and HBrO purified by rectification to the lithium salt product after passing through SO2, and then add lithium flakes to keep the humidity dew point of the container below -35°C to prepare an electrolyte.

[0023] The purity of the SO2 gas is more than or equal to 99.9999%, and the weight of SO2 is 2% of the solution.

[0024] The mass of the SO2 gas introduced is 20% of the mass of the lithium salt LiAlCl4.

[0025] The lithium salt LiAlCl4 is obtained by melting anhydrous LiCl and AlCl3, wherein the molar amo...

Embodiment 2

[0029] A preparation method of lithium thionyl chloride battery electrolyte, comprising the following specific steps:

[0030] a. Get the lithium salt LiAlCl4 and place it in a dry container, and SOCl2 is rectified and purified;

[0031] b. Pass SO2 gas into the lithium salt LiAlCl4, and let it stand for 18 hours after passing SO2;

[0032] c. Pass an appropriate amount of water vapor into BrCl, and get HCl and HBrO after full reaction;

[0033] d. Add the SOCl2, HCl and HBrO purified by rectification to the lithium salt product after passing through SO2, and then add lithium flakes to keep the humidity dew point of the container below -35°C to prepare an electrolyte.

[0034] The purity of the SO2 gas is more than or equal to 99.9999%, and the weight of SO2 is 3% of the solution.

[0035] The mass of the SO2 gas introduced is 25% of the mass of the lithium salt LiAlCl4.

[0036] The lithium salt LiAlCl4 is obtained by melting anhydrous LiCl and AlCl3, wherein the molar amo...

Embodiment 3

[0040] A preparation method of lithium thionyl chloride battery electrolyte, comprising the following specific steps:

[0041] a. Get the lithium salt LiAlCl4 and place it in a dry container, and SOCl2 is rectified and purified;

[0042] b. Pass SO2 gas into the lithium salt LiAlCl4, and let it stand for 20 hours after passing SO2;

[0043] c. Pass an appropriate amount of water vapor into BrCl, and get HCl and HBrO after full reaction;

[0044] d. Add the SOCl2, HCl and HBrO purified by rectification to the lithium salt product after passing through SO2, and then add lithium flakes to keep the humidity dew point of the container below -35°C to prepare an electrolyte.

[0045] The purity of the SO2 gas is more than or equal to 99.9999%, and the weight of SO2 is 4% of the solution.

[0046] The mass of the SO2 gas introduced is 30% of the mass of the lithium salt LiAlCl4.

[0047] The lithium salt LiAlCl4 is obtained by melting anhydrous LiCl and AlCl3, wherein the molar amo...

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PUM

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Abstract

The invention discloses a manufacturing method for a lithium thionyl chloride battery electrolyte. The manufacturing method specifically comprises the following steps of putting LiAlCl<4> into a dry container, and rectifying and purifying SOCl<2>; pumping SO<2> gas into the LiAlCl<4>, and then standing for 15-20h after the SO<2> is completely pumped; pumping a proper amount of water vapor to BrCL, and performing a complete reaction to obtain HCl and HBrO; adding the rectified and purified SOCl<2>, HCl and HBrO into a lithium salt product after the SO<2> is completely pumped; and then adding a lithium sheet, and maintaining a humidity dew-point temperature value of the container to be lower than minus 35 DEG C to obtain the electrolyte. According to the manufacturing method for the lithium thionyl chloride battery electrolyte, a proper amount of halogen or halogen compounds is added to the electrolyte; based on a principle that BrCl plus H<2>O is equal to HCl plus HBrO, the content of the halogen or halogen compounds in the electrolyte is increased; and the voltage delay condition of the battery is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a method for preparing an electrolyte solution 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, SOCl2 is both a reaction substance and a non-aqueous inorganic solvent, and the solution after dissolving additives such as LiAlCl4 is an inorganic electrolyte. This system battery is a new type of high-energy chemical power source developed in recent years. The overall reaction mechanism is: 4Li+2SOCl2→4LiCl+S+SO2, sulfur and sulfur dioxide are dissolved in excess thionyl chloride electrolyte, and during discharge, due to the generation of sulfur dioxide, there will be a certain degre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0563
CPCH01M10/0563Y02E60/10
Inventor 祝德洪
Owner 湖北艾超特新能源有限公司
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