Abstract
Thermal runaway of lithium-ion batteries has been of great concern in light of their anticipated widespread use in future information devices and in support of an environmentally friendly society. Although the utilization of a fire retardant liquid electrolyte or a solid-state electrolyte has been proposed as a possible solution thus far, the possibility of thermal runaway at elevated temperatures above ∼200 °C continues to exist. In this study, we focused on materials for the positive electrode, spinel-structured LiCoxMn2–xO4 (LCMO) with 0 ≤ x ≤ 1, because of their thermal stability and “zero-strain” characteristics particularly for the x = 1 composition. Here, the term zero-strain refers to lattice parameters that undergo changes that are negligibly small during the charge and discharge reactions. Differential scanning calorimetry clarified that the x = 1 sample exhibited the most optimal thermal stability among the LCMO samples investigated, and that the total heat generation of the LCMO(x = 1)|Li7La3Z...
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