Cathode Active Material and Manufacturing Method Thereof

High-Rate LiMn0.5Fe0.5PO4 Cathode Material via Precursor Volume Ratio Control and Carbon Coating

This technology synthesizes LiMn0.5Fe0.5PO4 cathode material by controlling the mixing volume ratio of lithium, phosphoric acid, iron, and manganese precursor solutions, followed by heating and stirring from room temperature to a target temperature. A carbon layer is then applied to the particle surface to prevent memory effects and improve rate capability.

Conventional iron-based cathode materials (LFP) suffer from memory effects during charge-discharge cycles, leading to reduced discharge voltage and capacity. Furthermore, they face significant limitations in rate capability under high-power demand conditions.

This technology optimizes the relationship between charge transfer resistance and lithium diffusion resistance by maintaining the volume ratio of the iron-manganese precursor solution to the phosphoric acid precursor solution between 3.41:1 and 4.54:1, gradually heating and stirring from room temperature to 180°C, and applying a surface carbon layer using ascorbic acid and glucose to prevent iron oxidation. Applicable to LMFP batteries for EVs, high-power power tools, and phosphate-based ESS cells, it maintains rapid discharge performance without voltage drop even after repeated partial charging.

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Key Features:

• Step of preparing a third precursor solution by providing and mixing iron and manganese precursor solutions in a solvent
• Step of preparing a mixed precursor solution by controlling the volume ratio of the third precursor solution to the second precursor solution to be between 3.41:1 and 4.54:1
• Step of preparing a cathode active material source solution by adding and mixing a lithium precursor-based first precursor solution into the mixed precursor solution
• Step of preparing the cathode active material by heating the source solution from room temperature to a first temperature while stirring, followed by washing and drying

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This invention was developed with support from the Ministry of Science and ICT for the discovery and investigation of new photoelectrochemical phenomena: controlling photoelectrochemical behavior through interface engineering.

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