The Influence of Organic-Inorganic Composite Solid Electrolytes on Electrochemical Performance in Solid-State Lithium Batteries

Abstract

Lithium batteries, as the most closely watched secondary batteries, exhibit outstanding performance. Nonetheless, the formation of lithium dendrites significantly compromises their safety and hampers further development. To mitigate the impact of lithium dendrites on batteries, solid-state lithium batteries have emerged, with solid electrolytes being of paramount importance. Traditional solid electrolytes are categorized into polymers, oxides, and sulfides. However, the inherent limitations of these materials impede their effectiveness. This study proposes a novel solid electrolyte consisting of organic and inorganic materials, aiming to harness the collective benefits of the two electrolyte types to improve the electrochemical performance of solid electrolytes. Empirical data from experiments on composite solid electrolytes, incorporating polyethylene oxide (PEO) with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) and Li10GeP2S12 (LGPS), reveal that these organic-inorganic composite solid electrolytes exhibit high ionic conductivity, reduced interface impedance, and an extensive electrochemical window. It demonstrates that organic-inorganic composite solid electrolytes combining polymers with oxides or sulfides can integrate the advantages of both, achieving electrolyte materials with superior electrochemical performance. Finally, the existing problems are discussed, and future research trends are anticipated.