Lithium ion battery has high energy density. LMPO₄ is a cathode active material with good performance and almost commercial battery in the world.  The substitution of Fe and Ni was used in synthesis of LiMnPO₄ with composition of LiMn0.7Fe_0.2Ni0.1PO4 . In this experiment LiMn0.7 Fe_0.2 Ni0.1PO4  was carried out with stoichiometric composition of technical raw materials, MnO2 and Fe2O3 from China, Ni from Merck, H3PO4 and LiOH.H2O from Germany. After calcinations process at 700⁰C in 2 hours and sintering 800⁰C in 4 hours by powder metallurgy method, the powder was milled and mixed in shaker mill with tapioca or cassava powder under comparison between tapioca and active material 1:7, 1:8, 1:9 in 1 hour. The mixed powder was heated at 800⁰C in 2 hours under nitrogen gasses. The heated powders was mixed with citric acid and was heated again at 800⁰C in 2 hours under nitrogen gasses. The produced powder was analyzed the characteristic of crystal structure, SEM, conductivity, cyclic voltammeter and charge – discharge. The produced powder has black color under coated carbon. The crystal structure of LiMn0.7Fe_0.2Ni0.1PO4 \C has a base olivine structure of lithiophilite.

Keywords: cathode, LiMnPO4, lithium battery, powder metallurgy, tapioca