Ion-exchange chromatography system for analyzing electrolyte solution, method of quantitative analysis of lithium salts in electrolyte solution, and preparation method for electrolyte solution using same
An ion-exchange chromatography and quantitative analysis technology, which is applied in the field of ion-exchange chromatography system for electrolyte analysis, quantitative analysis of lithium salt in electrolyte and preparation of electrolyte using it, can solve the difficult quantitative analysis and analysis methods of nuclear magnetic resonance Analysis of multiple metal salts and other issues to achieve the effect of improving production volume management, shortening adjustment lead time, and improving productivity
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[0046] The preparation method of the electrolyte solution of the present invention comprises the ion exchange chromatography system. At this time, it is possible to quantify a variety of lithium salts in the finished electrolyte without interference from additives, thereby greatly shortening the adjustment lead time, and being able to skip (skip) intermediate inspection steps, thereby greatly improving productivity and greatly Improve throughput management, analytical reliability and customer satisfaction.
[0047] As an example, the preparation method of the electrolyte may include a quantitative analysis method for lithium salts in the electrolyte.
[0048] Sampling devices, column conditions, suppressors, IC consumables, IC accessories, and other quantitative analysis methods that are not described in this application can be used as long as they are available in the technical field of the present invention, and can be used according to functions and needs. Make the appropr...
Embodiment
[0051]
[0052] Put into the cleaned tank an organic solvent mixed with ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) in a volume ratio of 3:5:2, the total amount being 0.1 ~10% by weight of silyl borate compounds and organic halophosphino compounds as additives and 0.6 ~ 2M LiPF as lithium salt in total 6 and LiBF 4 and mixed to prepare the first step metal salt solution.
[0053] Add 0.01 to 5% by weight of LiPO to the first step metal salt solution 2 f 2 and 0.1-5% by weight of fluoroethylene carbonate (FEC) and mixed to prepare the second-step metal salt solution.
[0054] 0.1-3% by weight of LiBOB is added to the metal salt solution in the second step to prepare a finished electrolyte solution.
Embodiment 1～5
[0062] Utilize the anion-exchange chromatographic analysis device that is combined with electric conductivity detector (940Profic IC, Metrohm company manufactures), the condition described in following table 2, the electrolytic solution product prepared has been quantitatively analyzed, and its result is recorded in Table 2 below and Figure 1~2 middle.
[0063] In the following results, whether to separate means whether the peaks between the various ions to be measured overlap, and whether to interfere means whether the ion peaks to be measured are interfered by additives other than lithium salt ions. When PO 2 f 2 - 、BOB - , BF 4 - and PF 6 - When 2 to 3 ions in the plasma are not overlapped and separated, it is rated as △, when PO 2 f 2 - 、BOB - , BF 4 - and PF 6 - When the plasma is completely separated, it is rated as O. In addition, when PO 2 f 2 - 、BOB - , BF 4 - and PF 6 - When 2 to 3 ions in the plasma are not interfered by additives, etc., it i...
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