Method for determining content of additive in lithium ion battery electrolyte

A lithium-ion battery and measurement method technology, which is applied in the field of determination of additive content in lithium-ion battery electrolyte, can solve the problems of large test error and poor reproducibility, and achieve the effect of reliable measurement

Active Publication Date: 2019-11-05
TIANJIN LISHEN BATTERY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These existing methods can meet the requirements of analysis for the lithium-ion battery electrolyte of most formulas, but, for some high boiling points, thermal decomposition and water-sensitive electrolyte additive components, when applying these conventional methods, Often due to poor reproducibility, resulting in large test errors

Method used

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  • Method for determining content of additive in lithium ion battery electrolyte
  • Method for determining content of additive in lithium ion battery electrolyte
  • Method for determining content of additive in lithium ion battery electrolyte

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Embodiment 1

[0052] Taking an electrolyte solution containing additive LiODFB as an example, the present invention will be described in detail in conjunction with the accompanying drawings, so as to further illustrate the substantive features of the present invention. In this embodiment, the method of the present invention is used to detect the content of the additive LiODFB in the electrolyte.

[0053] The first step is to prepare four basic electrolytes (DMC:EMC:EC=3:3:4, 1.2mol / L LiPF6) using conventional lithium-ion battery electrolytes and solvents, and add different contents of the additive LiODFB to be tested to obtain four Prepare four 18650-type standard sequence batteries with this sequence electrolyte, record the amount of electrolyte added, and record the data as shown in Table 1.

[0054] Table 1: Data table of liquid injection volume and additive content of standard serial batteries.

[0055]

[0056] The second step is to charge the four standard series batteries obtaine...

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Abstract

The invention discloses a method for determining the content of an additive in lithium ion battery electrolyte, and the method comprises the following steps of firstly, manufacturing and obtaining a plurality of standard sequence batteries; secondly, charging each standard sequence battery at constant current, and measuring voltage and capacity; thirdly, drawing a capacity differential curve of each standard sequence battery to obtain a reaction peak position and integrating to obtain reaction peak height and peak area data; fourthly, drawing a scatter diagram of the standard sequence battery,and fitting to obtain a quantitative relation between the quality of the additive and the reaction peak area or peak height data; fifthly, as for the electrolyte to be measured having the additive tobe measured, manufacturing electrolyte battery to be measured; and sixthly, drawing a capacity differential curve of the electrolyte battery to be measured to obtain the reaction peak position, integrating to obtain reaction the peak height and peak area data, and calculating the quality of the additive with the content to be measured. The method for determining the content of the additive in lithium ion battery electrolyte can accurately and reliably measure the content of the additive in the lithium ion battery electrolyte.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for determining the content of additives in electrolyte solutions of lithium-ion batteries. Background technique [0002] At present, lithium-ion batteries have been widely used in digital products, electric vehicles and energy storage fields due to their advantages such as high energy density, good cycle performance, green and pollution-free. Electrolyte is an important part of lithium-ion batteries, and a small amount of additives in it plays a vital role in improving battery performance. [0003] In the prior art, conventional methods for component analysis of lithium-ion battery electrolytes include: gas chromatography, gas chromatography-mass spectrometry, ion chromatography, and the like. Among them, gas chromatography and gas chromatography-mass spectrometry are suitable for the detection of organic components in electrolytes, while ion chromatograp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416G01R31/385
CPCG01N27/4166G01R31/385
Inventor 李飞赵培韩江浩李慧芳王睿伍绍中周江
Owner TIANJIN LISHEN BATTERY
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