This technology synthesizes an inverse-fluorite structured lithium transition metal oxide cathode material by mixing lithium, iron, and manganese sources in a 5+x:x:1-x molar ratio, pelletizing the mixture, and calcining it in a nitrogen-hydrogen (95:5) atmosphere while heating at a rate of 9–11°C/min.
Conventional lithium-manganese oxides suffer from low electrochemical reactivity and unstable crystal structures. Furthermore, the synthesis process often leads to the formation of byproducts like Li2MnO3, which reduces the yield of the target phase.
This technology enhances electrochemical performance by doping iron into the manganese site. By heat-treating the material in pellet form while injecting a 95:5 nitrogen-hydrogen gas mixture at 3–5 cc/min, it suppresses byproduct formation and allows for the control of orthorhombic or tetragonal structures based on the x-value. It can be applied as a cathode additive to compensate for initial irreversible capacity or used in high-capacity lithium secondary battery cathodes, making it an attractive option for cell manufacturers looking to secure additional lithium sources through cost-effective iron-manganese combinations.
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