Synthesis LiMn0.7Fe0.2Ni0.1PO4 and Carbon Coating with Cassava Powder and Citric Acid as Carbon Source

Abstract

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 LiMn0.7Fe0.2Ni0.1PO4 . In this experiment LiMn0.7 Fe0.2 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 LiMn0.7Fe0.2Ni0.1PO4 \\C has a base olivine structure of lithiophilite. Keywords: cathode, LiMnPO4, lithium battery, powder metallurgy, tapioca