Metal Composite Oxide, Manufacturing Method Thereof, and Method for Measuring Sulfate Concentration During the Manufacturing Process

Method for Manufacturing Metal Composite Oxides with Real-Time Prediction of Residual Sulfate via Raman Spectroscopy

This technology is a process for controlling the quality of metal composite hydroxide precursors during continuous co-precipitation by measuring and predicting the concentration of residual sulfate in the reactor in real-time using Raman spectroscopy.

In conventional co-precipitation methods using sulfate raw materials, unreacted sulfate remains as an impurity in the precursor, which degrades the performance of the cathode active material.

By measuring the Raman spectrum of the metal composite hydroxide solution (specifically the intensity of the main sulfate peak at 980 cm⁻¹) and comparing it with pre-established Raman spectra for standard sulfate concentrations, this technology enables the measurement and prediction of residual sulfate levels in the reactor, thereby improving both the performance and commercial viability of secondary batteries.

‍

‍

Key Features:

• Injecting a primary metal salt solution containing nickel and cobalt into a reactor filled with distilled water
• Simultaneously injecting a secondary metal salt solution containing elements selected from aluminum, manganese, and others
• Adding sodium hydroxide to the reactor to produce metal composite hydroxide precursors via continuous co-precipitation
• Managing quality by measuring and predicting residual sulfate concentration in the reactor in real-time using Raman spectroscopy

‍