A method for measuring vinylene carbonate and its application
A vinylene carbonate, to-be-detected technology, applied in the field of non-aqueous electrolyte component detection of lithium-ion batteries, can solve the problems of harsh experimental conditions and long detection time, and achieve simple test conditions, short test time, and accurate test data and stable effect
Active Publication Date: 2020-12-01
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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Problems solved by technology
[0007] Aiming at the problems of long detection time and harsh experimental conditions in the existing detection technology of vinylene carbonate content, the present invention provides a method for measuring vinylene carbonate and its application
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Embodiment
[0052] This embodiment is used to illustrate a kind of method for measuring vinylene carbonate disclosed by the present invention and its application, comprising the following steps:
[0053] 1) In a vacuum glove box with an argon protective atmosphere, pipette 3ml of the lithium-ion battery electrolyte sample to be tested and inject it into the three-electrode electrolytic cell, shake well to obtain a vinylene carbonate solution to be tested.
[0054] 2) In the vacuum glove box of the argon protective atmosphere, the lithium battery electrolyte solution with a mass content of 0wt%, 1wt%, 2wt%, and 3wt% additive vinylene carbonate, (LiPF 6 (The concentration of solute is 1mol / L, the mass ratio of ethylene carbonate EC (solvent) and dimethyl carbonate DMC (solvent) is 1:1), as the standard solution.
[0055] 3) Pipette 3ml of the lithium battery electrolyte solutions prepared in step 2) with different vinylene carbonate contents and inject them into the three-electrode electrol...
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In order to overcome the problems of long detection time and harsh experimental conditions in the existing vinylene carbonate content detection technology, the invention provides a method for determining vinylene carbonate, which comprises the following operation steps: pretreatment: applying direct-current voltage to a vinylene carbonate solution; obtaining a fitting formula: obtaining standard-concentration vinylene carbonate solutions with different vinylene carbonate concentrations, respectively carrying out cyclic voltammetry test on each preprocessed standard-concentration vinylene carbonate solution, and carrying out fitting to obtain the fitting formula; and carrying out cyclic voltammetry test on the pretreated vinylene carbonate solution to be detected, and substituting the oxidation peak value of the vinylene carbonate solution to be detected into the fitting formula to obtain the concentration of vinylene carbonate in the vinylene carbonate solution to be detected. The invention also discloses an application of the vinylene carbonate preparation method. The method for determining vinylene carbonate provided by the invention has the advantages of simple test conditions,accurate and stable test data and short test time.
Description
technical field [0001] The invention belongs to the technical field of detection of non-aqueous electrolyte components of lithium-ion batteries, and relates to a method for measuring vinylene carbonate and an application thereof. Background technique [0002] Lithium-ion batteries have become one of the hot spots in international electrochemistry and energy research in the past 20 years due to their excellent characteristics such as low self-discharge rate, good cycle performance, no memory effect, and no pollution. Commercial lithium-ion batteries generally include four key materials: positive electrode, negative electrode, separator, and electrolyte. [0003] Among them, the electrolyte is used as the lithium ion transmission medium, which is very important for the specific capacity, operating temperature, cycle performance, and safety performance of the lithium ion battery. With the continuous improvement of people's performance requirements for lithium batteries, the el...
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IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 常毅郑方明梅骜黄志彬
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD