ELECTRON PROBABILITY (P0) AT LiFePO4 /C AND LiFe0,99GD0.01PO4/C CATHODES WITH DIFFERENT COATING MATERIALS A. Suprabawati, Istiqomah, H. Nofiati, N.F. Maulida, S.N.Azizah
UNJANI
Abstract
ABSTRACT
In this study, a mathematical calculation of the probability of the electron path (P0) in the cathode battery component to the anode was carried out. In this study, a mathematical calculation of the probability of the electron path (P0) on the cathode to the anode battery component was carried out. The electron path is formed through various interfaces between the cathode and the CEI electrolyte (Carbon electrolyte interphase). LFP lithium ion cathode material without LiFePO4 doped and LiFe0.99Gd0.01PO4 doped was synthesized by solid state method with carbon coating. Various coating materials, namely carbon (C), graphite (C6) and activated carbon (C+). The electron path probability (P0) describes the number of electrons from the anode that reaches the carbon (C) surface first as a coating which is proportional to the value of the tunneling current (Itl). In batteries the electron (e-) path is important to study because it balances lithium ions (Li+) which both move in opposite directions in the electrochemical reaction of the battery. The movement of electrons which is a wave function occurs in various contact areas of the electrolytic cathode and anode electrodes. This contact area consists of region I of the surface of the LiFePO4/C electrode with the outermost being carbon (C), region II of the interface (interphase) on the inner CEI (Carbon electrolyte interphase) layer, region III of the liquid solvent LiPF6. From the results of the study, the P0 value at the LiFePO4 /C cathode of palm shell activated carbon was P0 = 2.6238, graphite activated carbon (C6) P0 = 3.2169 P0 value at the LiFe0.99Gd0.01PO4/C cathode on carbon black ( C) is equal to P0=3,2037 . The electron path probability value (P0) which indicates good electron movement is in the range > 1.
Keywords: electron path probability (P0), LiFePO4 cathode, LiFe0.99Gd0.01PO4/C cathode, CEI cathode (Carbon electroltye interphase) and coating material
