A cathode nanomaterial LiFe0.8Mg0.2PO4 with olivine structure was synthesized by the sol-gel method and studied using X-ray diffraction analysis, scanning electron microscopy, Mössbauer spectroscopy and electrochemical testing under the operating conditions of a lithium-ion battery. It is demonstrated that the iron substitution with magnesium occurs in the studied material. Discharge capacity of LiFe0.8Mg0.2PO4/С is 127 mAh g−1 at a current of 20 mA g−1 and is close to the theoretical value for the considered composition. It is determined utilizing Mössbauer spectroscopy that at the early stage of the LiFe0.8Mg0.2PO4 charging process nanoscale regions are formed, having a FePO4 structure and an enhanced solubility of divalent iron ions.
Solid State Ionics – Elsevier
Published: Apr 1, 2018
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