Synthesis of high-density olivine LiFePO₄ from paleozoic siderite FeCO₃ and its electrochemical performance in lithium batteries

The lithium-ion cathode material olivine LiFePO 4 (LFP) has been synthesized for the first time from natural paleozoic iron carbonate (FeCO 3 ). ferrous starting consists of mineral siderite at about 92 wt. % purity. Because FeCO divalent iron, reaction with lithium dihydrogen phosphate (LiH 2 PO ) provides a unique method to develop iron-(II) containing LFP in an inert atmosphere. Since is common that can be directly mined, it may, therefore, provide inexpensive route production LFP. After carbon-coating, yields capacity range 80–110 mAh g ?1 (in one chosen specimen sample), which lower than commercially available (150–160 However, tap density derived noticeably high 1.65 cm ?3 . likely improved powder purification, nanosized processing, and more complete carbon-coating coverage increased optimization.