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Measuring method of TMSP in lithium battery electrolyte

A measurement method and electrolyte technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to accurately quantify TMSP, and achieve the effect of convenient analysis and measurement work and good accuracy

Active Publication Date: 2019-01-04
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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Problems solved by technology

Therefore, TMSP cannot be accurately quantified by GC method (gas chromatography)

Method used

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  • Measuring method of TMSP in lithium battery electrolyte
  • Measuring method of TMSP in lithium battery electrolyte
  • Measuring method of TMSP in lithium battery electrolyte

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Embodiment Construction

[0017] The present invention will be described in further detail below.

[0018] The assay method of TMSP in lithium battery electrolyte comprises the following steps. The Chinese name of TMSP is tris(trimethylsilane) phosphate.

[0019] 1. Preparation of regeneration solution. The regeneration liquid is a sulfuric acid solution, and the concentration of the sulfuric acid solution is 0.07mol / L-0.09mol / L (both ends are included). Taking the preparation of a sulfuric acid solution with a molar concentration of 0.08mol / L as an example, the specific preparation steps include: Weigh 16.5g±1g of concentrated sulfuric acid, slowly pour it into 2L of deionized water, mix well, and filter it with a 0.1μm~0.45μm filter membrane , ultrasonic degassing to obtain a sulfuric acid solution with a molar concentration of 0.08 mol / L.

[0020] Second, the preparation of eluent. The eluent is Na 2 CO 3 and NaHCO 3 Aqueous solution of acetonitrile, Na 2 CO 3 and NaHCO 3 The molar concent...

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Abstract

The invention discloses a measuring method of TMSP in a lithium battery electrolyte. The method includes the following steps of firstly, preparing regenerated liquid, wherein the regenerated liquid isa sulfuric acid solution; secondly, preparing leacheate, wherein the leacheate is an acetonitrile water solution of Na2CO3 and NaHCO3; thirdly, preparing a standard solution, wherein the standard solution is a TMSP water solution, and the concentration of the TMSP in the standard solution is 50-75 ppm (with end values of the two ends); fourthly, diluting a sample applicator solution with distilled water to obtain a to-be-measured sample solution, wherein the time from sampling to dilution completing of the sample solution is shorter than or equal to 20 min, and the theoretical concentration of the TMSP in the to-be-measured sample solution is the same as the concentration of the TMSP in the standard solution; fifthly, conducting anion chromatography on the standard solution and the to-be-measured sample solution through an anion chromatographic instrument; sixthly, calculating the content of the TMSP in the sample solution. The method has the advantages of being feasible, effective, convenient to implement, rapid and high in accuracy.

Description

technical field [0001] The invention relates to a method for measuring TMSP in lithium battery electrolyte. Background technique [0002] TMSP, Chinese name: Tris(trimethylsilane) phosphate. As a new type of additive, TMSP has been more and more widely used in lithium battery electrolyte formulations in recent years. [0003] Due to the active chemical properties of TMSP, it is easy to decompose in the air, so it is difficult to quantify it. When the GC method (gas chromatography) is used for measurement, the characteristic peak of TMSP in the lithium battery electrolyte in the gas chromatogram becomes smaller and smaller with time, and even no peak appears, and its mechanism has not yet been explored clearly. Therefore, TMSP cannot be accurately quantified by the GC method (gas chromatography). [0004] When the lithium battery electrolyte is produced, each component in the lithium battery electrolyte formula has a certain concentration requirement. The concentration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96G01N30/06
CPCG01N30/06G01N30/96
Inventor 李娟刘敏刘云生丁嘉蕾宋娟许芬
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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