Quantitative measuring method of lithium ion battery electrolyte solvent

A lithium-ion battery, quantitative measurement technology, applied in measurement devices, material separation, instruments, etc., can solve the problems of easy detection by impurities, low quantitative detection accuracy, and high detection equipment requirements, and achieve low detection equipment requirements. Fast, less time-consuming effects

Active Publication Date: 2015-07-22
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of high requirements for detection equipment, high price, cumbersome detection process, low accuracy of quantitative detection and detection easily interfered by impurities in the existing lithium-ion battery electrolyte solvent and additive quantitative analysis method, and provide A Quantitative Measurement Method for Lithium-ion Battery Electrolyte Solvent

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  • Quantitative measuring method of lithium ion battery electrolyte solvent
  • Quantitative measuring method of lithium ion battery electrolyte solvent
  • Quantitative measuring method of lithium ion battery electrolyte solvent

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specific Embodiment approach 1

[0022] Specific embodiment one: the quantitative measurement of lithium-ion battery electrolyte solvent and functional additive in this embodiment is carried out according to the following steps:

[0023] 1. Prepare standard solutions of different concentrations with pure substances, and then add internal standard substances of the same quality to make internal standard standard solutions with the same concentration of internal standard substances;

[0024] Two, under the same chromatographic conditions, measure the internal standard standard solution respectively, take the ratio of the chromatographic peak area of ​​the pure substance and the internal standard substance as the ordinate Y, and take the standard solution concentration as the abscissa, draw the internal standard standard working curve of the pure substance ;

[0025] 3. Take a certain quality of the lithium-ion battery electrolyte solvent to be tested, put it into the same solvent as the internal standard soluti...

specific Embodiment approach 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the solvent used to prepare the internal standard solution in step 1 is acetone, acetonitrile, isopropanol, ethanol or dichloromethane. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, the internal standard substance is a component that does not exist in the lithium-ion battery electrolyte solvent to be detected, and the chromatographic peak of the internal standard substance is easily compared with the component to be detected. There is no overlap between the detected substances, and there is no chemical reaction with the detected components, and it can be completely dissolved in the internal standard solution solvent. Other steps and parameters are the same as those in Embodiment 1 or 2.

[0030] The internal standard must meet the following requirements: a. The lithium-ion battery electrolyte solvent sample to be tested does not contain components, can be completely dissolved in the sample, and does not chemically interact with the components to be tested; b. The peak position should be as close as possible to The peak position of t...

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Abstract

The invention relates to a quantitative measuring method of a lithium ion battery electrolyte solvent, which relates to a quantitative measuring method of a battery electrolyte solvent, and solves the problems of the existing lithium ion battery electrolyte solvent and the additive quantitative analysis method that the requirement on detection equipment is high, the price is high, the detection process is complicated, the quantitative detection accuracy is low and the detection is easily subjected to the interference of impurities. The measuring method comprises the following steps: I, preparing an inner standard solution identical in internal standard substance concentration; II, drawing an internal standard working curve; III, preparing a detection solution; and IV, calculating the concentration of a component in the detection solution according to a specific value Y of the chromatographic peak area to the internal standard substance chromatographic peak area. The method is suitable for detecting a great number of analysis samples and has advantages of high detection speed, little time, high efficiency and the like.

Description

technical field [0001] The invention relates to a quantitative measurement method for battery electrolyte solvent. Background technique [0002] The lithium-ion battery industry is an important pillar for the development of the country's new energy industry. The positive electrode material, negative electrode material and electrolyte are the three major elements that make up a lithium-ion battery. As the core of lithium-ion batteries, positive and negative electrode materials have received considerable attention. However, the research and development of the electrolyte, which is also a core element, has received far less attention than the positive and negative electrode materials. The electrolyte of lithium-ion batteries is composed of organic solvents, electrolyte lithium salts and functional additives. The electrolyte plays the role of transferring charge between the positive and negative electrodes in the battery, and plays a vital role in the specific capacity, opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 戴长松刘元龙穆德颖马全新郑茹娟闵秀娟贾铮赵力
Owner HARBIN INST OF TECH
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