Mg-Zn-Mn oxide systems for a rechargeable Mg-battery cathode

Ye, X.*; 下川 航平*; 毛塚 有飛*; 畠山 拓也*; Li, H.*; 市坪 哲

Ye, X.*; Shimokawa, Kohei*; Kezuka, Yuto*; Hatakeyama, Takuya*; Li, H.*; Ichitsubo, Tetsu

In this study, wide-range compositions in Mg-Zn-Mn oxide systems were investigated to understand its phase stability for the development of high-energy-density rechargeable Mg batteries. The obtained results showed that the stability of the spinel structure can be significantly improved by compositionally incorporating stable XO (X = Zn, Mg) with -MnO. In particular, (i) the equimolar mixing of XO and MnO is essential to obtain a single-phase cubic spinel structure and (ii) a higher Zn/Mg ratio is effective for preventing the formation of an irreversible rock salt phase to decrease the overpotential during discharge/charge cycling.