Pressure dependence of the thermal stability in LiMn₂O₄

Abstract

Structural stability in terms of the decomposition temperature in LiMn2O4 was systematically investigated by a series of high-temperature and high-pressure experiments. LiMn2O4 was found to have structural stability up to 5 GPa at room temperature. Under ambient pressure, the compound decomposed at 1300 °C. The decomposition temperature decreased with increasing pressure, yielding more complex decomposed products, Below the decomposition temperature, the crystal structure of LiMn2O4 varied with pressure. The presented results in this study offer new insights into the thermal and pressure stability of LiMn2O4 materials as a cathode for lithium-ion batteries that can operate under extreme conditions. Therefore, these findings may serve as a useful guide for future work for improving lithium-ion batteries.

Thermal‐Induced Structure Evolution at the Interface between Cathode and Solid‐State Electrolyte

“…On the other hand, the forming temperatures for oxide cathodes are normally 750-900 °C. [22][23][24] The fabrication of the intimate interface between SSE and cathode usually requires a solid-state sintering process, with indispensable ionic diffusion to form the compact interface and increase Li-ion conductivity. [25,26] Unfortunately, the interphases with low ion conductivity would also form under high temperature, leading to restricted Li ion transportation.…”