Electrochemical reactions and cathode properties of Fe-doped Li2O for the hermetically sealed lithium peroxide battery

Material Design Concept of Lithium‐Excess Electrode Materials with Rocksalt‐Related Structures for Rechargeable Non‐Aqueous Batteries

“…Moreover, the concept of the anion redox reaction, not only for the oxide system is extended to the sulfide system . In addition, these concepts would be extended non‐rocksalt system, e. g ., Li 4 Mn 2 O 5 and Li 2 O system . Experimental and theoretical understandings of cationic/anionic redox are also further accelerated from the research progress on oxygen electrocatalysts as another important anionic redox system, and a possible synergy between battery materials and electrocatalysts is anticipated .…”

Universal solid-state oxygen redox in antifluorite lithium oxidesviatransition metal doping

“…The atomic ratio of TM/(Li + TM) was set to 10, 9, and 9% for Fe-, Co-, and Cu-doped Li 2 O, respectively, with reference to the previous reports. 46,49,53 Characterization Powder X-ray diffraction (XRD) patterns were recorded on a RIGAKU SmartLab system using monochromatized Cu-Ka 1 radiation. The sample was mounted on a gas-tight holder with a Be window under Ar.…”

“…This initial capacity loss in FeDL is probably caused by the difficulty with À O annihilation (i.e., reduction of Fe 4+ to Fe 3+ ). 46 In the case of CuDL, the discharge capacity gradually decreased during the charge/discharge cycles because of the decomposition of CuDL. This decomposition is mainly caused by Jahn-Teller distortion of Cu 2+ ; tetrahedrally coordinated Cu in the Li 2 O structure can transform into Li 2 CuO 2 with a square planar coordination via charge/discharge repetition.…”

“…The scanning electron microscopy (SEM) images show that aggregation of particles occurs and the particle size is ranged from 1 to 10 mm (see Fig. S3 46,49,53 This can, probably occur because Ni prefers octahedral coordination over tetrahedral coordination. 54 The undoped LiNiO 2 remains as the LiNiO 2based phase; in the phase, the main peak of the pristine LiNiO 2 at around 181 almost disappears, while broad peaks at 381, 451, and 641 are observed (see Fig.…”

“…Contrarily, metal doping of Li 2 O effectively utilizes oxygen redox. Previous studies have reported that 5-10 mol% TM consisting of Fe, 46 Co, [47][48][49][50][51][52] Cu, 53 Rh, 47 and Ir 47 are substitutionally introduced to the cationic site of Li 2 O. The transition metal-doped Li 2 O (TMDL) cathodes exhibit a reversible solid-state oxygen redox reaction, along with a TM dopant redox reaction.…”