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Olivine lithium manganese phosphate was synthesized by a mechanochemical method. Inorganic cathode materials can be divided into three kinds of lithium metal oxide layered, spinel oxide and olivine metal phosphate. One important of the cathode materials used in Li-ion cells is LiMnPO₄. In this paper two different precursors, manganese violet and ammonium manganese phosphate proposed as reactant in the synthesis of LiMnPO₄ nanostructures. Reaction between NH₄MnP₂O₇ and Li₂CO₃ takes placed in solid state at room temperature. In this mechanochemical process, a solid acid and base reaction occurred between ammonium and carbonate ions. In addition, Mn^III is unstable oxidation state and convert to crystalline β-MnO₂, Li₂MnP₂O₇ and NH₄H₂PO₄ in the disproportionation reaction. Results showed that mechanochemical reaction between NH₄MnP₂O₇ with Li₂CO₃ as precursors lead to …