Quantitative method for detecting small amount of organic additives in electrolyte by GC-MS

Abstract

The invention discloses a quantitative method for detecting small amount of organic additives in electrolyte by GC-MS (Gas Chromatography-Mass Spectrometer). The quantitative method comprises the following steps: preparing a standard solution, measuring the standard solution in an SCAN mode, determining characteristic quantitative and qualitative ion peaks of each additive in the standard solution, and establishing a mass spectrum library of each additive; determining a standard solution in an SIM mode according to the characteristic quantitative and qualitative ion peaks of each additive, anddrawing a standard curve according to the content and peak area of the standard solution; taking dichloromethane as a diluent to dilute a to-be-detected electrolyte sample; testing a to-be-tested electrolyte sample by adopting an SCAN mode, and carrying out qualitative treatment on the additives; and testing the to-be-tested electrolyte sample by adopting an SIM mode, and quantifying the additives. According to the method, the organic additive in the lithium ion battery electrolyte is analyzed by adopting the newly built mass spectrum library of the common electrolyte additive, and the qualitative result is high in accuracy. Under the qualitative condition, the quantitative result with higher accuracy is obtained by utilizing the SIM mode, and the specific performance of the lithium ion battery is favorably improved.

Description

technical field [0001] The invention relates to the technical field of determination of organic components in electrolytes of lithium-ion batteries, in particular to a quantitative method for detecting a small amount of organic additives in electrolytes by GC-MS. Background technique [0002] In order to improve the performance of lithium-ion batteries, many methods have been used, and the cheapest and most effective way is to add modification. The specific performance of lithium-ion batteries can be significantly improved by adding a small amount of compounds with special functions. These compounds with special functions are called lithium-ion battery additives. At present, there are five main categories of lithium ion additives, which are additives to improve SEI film performance, additives to improve lithium ion conductivity, overcharge protection additives, additives to improve battery safety, and additives to control water and HF content in the electrolyte. [0003] G...

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Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the present invention provides a quantitative method for detecting a small amount of organic additives in the electrolyte by GC-MS, which solves the technical problem that unknown additives cannot be retrieved in the prior art

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