Low-Level UV-Vis Haze Detection for Lithium-Ion Battery Electrolytes

This application note presents a technical report on the use of UV-Vis spectroscopy for quality control in lithium-ion battery (LIB) electrolytes. It specifically focuses on haze measurements as a method to detect particulate contaminants that can affect battery performance, safety, and lifespan. The report details the challenges posed by water-sensitive components in electrolyte solutions and how even trace amounts of particulate contamination can compromise their quality. The Agilent Cary 60 UV-Vis spectrophotometer, equipped with a diffuse reflectance accessory (DRA), is highlighted as an effective tool for assessing electrolyte integrity. The methodology involves measuring haze levels in battery-grade electrolytes under various storage conditions, demonstrating the instrument's sensitivity to changes that may not be visible to the naked eye. The findings indicate that haze levels increase significantly with time and exposure to moisture, underscoring the importance of this technique in maintaining high-quality battery components.