ПЕРСПЕКТИВНЫЕ НЕОРГАНИЧЕСКИЕ ТВЕРДЫЕ ЭЛЕКТРОЛИТЫ С ЛИТИЙ-ИОННОЙ ПРОВОДИМОСТЬЮ

Abstract

New effective methods for the synthesis of inorganic solid electrolytes with high lithium-ion conductivity at room temperature have been developed at ICTREMRM KSC RAS. These are solid electrolytes of the composition Li1+xAlxTi2-x(PO4)3 (LATP) and Li1+xAlxGe2-x(PO4)3 (LAGP) with a NASICON structure and with a garnet structure of the composition Li7-3хAlxLa3Zr2O12 (LLZ) with a wide window of electrochemical stability. Synthesis methods are easily scaled, do not require complex technological equipment and are protected by patents of the RF. The report presents the results of physico-chemical, thermal and electrochemical studies of synthesized materials by modern methods. Morphology and microstructure were studied by scanning electron microscopy. The values of the specific ionic conductivity for LATP, LAGP and LLZ at room temperature, measured by impedance spectroscopy, were in the range of 10-3–10-4 S/cm, which corresponds to the maximum values for solid electrolytes of the specified composition. The temperature dependence of the ionic conductivity in the range of 25-200°C was studied and the activation energy of the conductivity (0.28–0.42 eV). Based on electrochemical characteristics, synthesized solid electrolytes are promising materials for all solid-state lithium-ion batteries.