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The development of an in situ high-temperature X-ray diffraction technique for lithium-ion battery materials is crucial for understanding the detailed mechanism of thermal runaway. We realized such a technique and employed it on a C6Lix electrode with an LiPF6-based electrolyte, thereby revealing multiple transformations through several intermediate stages, i.e., C6Li → C12Li → C18Li/C24Li → C36Li → C6, which could be helpful to improve the thermal stability. [ABSTRACT FROM AUTHOR]

Li-rich compounds have received significant attention as electrode materials for lithium-ion batteries (LIBs) because of their large rechargeable capacities (qrecha). We have demonstrated a novel reaction scheme of one of the Li-rich compounds, Li[Li0.15Mn1.85]O4, where Mn4+ ions are reduced to lower valence states such as Mn3+ and Mn2+ ions during charging at voltages above 5.0 V. [ABSTRACT FROM AUTHOR]