Preparing method of electrolyte for lithium thionyl chloride cell

A lithium thionyl chloride battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of ineffective removal of heavy metal impurities, ineffective release of battery power, and aggravated battery hysteresis, so as to facilitate large-scale production and easy technology Effects of mastering and slowing down the spawn rate

Inactive Publication Date: 2005-06-01
武汉孚特电子科技有限公司
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Problems solved by technology

[0003] The preparation method of existing lithium sub-battery electrolyte solution mostly is to use LiAlCl 4 (Lithium chloride aluminum salt) dissolved in SOCl according to the specified concentration 2 (thionyl chloride) to prepare the solution, and then adopt the heating and reflux mode to remove water, because this method does not have the electrode raw material LiAlCl 4 After processing, the heavy metal content in the final electrolyte is high, which leads to an increase in side reactions of the battery, so that the battery power cannot be effectively released, and the generation of battery hysteresis is aggravated
Chinese patent applicati

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[0016] The present invention will be further described in detail below in conjunction with specific embodiments.

[0017] The specific implementation of the present invention is as follows: firstly, distill and purify thionyl chloride on a rectifying column with a height of 1 meter, and take 2000 grams of thionyl chloride distillate in a dry environment with a humidity dew point of ≤-25°C Divide into a three-necked flask and add LiAlCl 4 (From equimolar anhydrous AlCl 3 It is melted with LiCl), high-capacity battery electrolyte is added 420 grams (ie 1.2M electro-hydraulic), high-power battery electrolyte is added 520 grams (ie 1.5M electro-hydraulic), and finally 3mm×40mm× 20-25 grams of 0.3mm lithium strip, without stirring, the prepared solution is heated and refluxed for 12 hours. Pass 240 grams of SO into the refluxed and purified solution 2 , And then filter and subpackage in an environment with humidity dew point ≤ -35℃ to obtain qualified electrolyte.

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Abstract

The present invention is improved preparation process of electrolyte for lithium thionyl chloride. The SOCl2 solution is first rectified, then added with LiAlCl4 and metal lithium and heated and reflux purified for at least 12 hr, SO2 gas is injected into the solution, and in dry environment, the solution is filtered to prepare the electrolyte. The electrolyte has raised purity and can improve the voltage lag state of the lithium cell effectively.

Description

technical field [0001] The present invention relates to the field of electrochemistry, more specifically, it relates to the improvement of the electrolyte preparation method of lithium thionyl chloride battery (referred to as lithium sub-battery). Background technique [0002] Lithium sub-battery is a kind of battery with the highest specific energy in the actual application battery in the world at present, and it adopts liquid negative electrode, namely electrolyte solution described in the present invention. A characteristic of lithium sub-batteries is that the reaction product lithium chloride will adhere to the cathode to form a dense passivation film, thereby preventing the battery reaction from continuing. Under normal discharge current, this film can be easily broken down by the current, but when the battery is under low-current discharge or storage, the film will continue to thicken, and when a large current is required to work, the battery will not work normally. T...

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Application Information

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IPC IPC(8): H01M6/16H01M10/0563H01M10/058
CPCY02E60/10Y02P70/50
Inventor 段金荣王党辉
Owner 武汉孚特电子科技有限公司
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