Hollow Ni1-Xcoxseo3/Ni1-Xcoxse2 as a Promising Cathode Material for Mg2+/Li+ Dual-Ion Batteries

Abstract

Mg-lithium hybrid-ion batteries (MLHBs), which combine the high safety of magnesium anodes with the fast ion dynamics of lithium ions, are promising emerging energy storage systems. First, the cubic precursor nickel-cobalt carbonate was synthesized by the solvothermal method, and the hollow Ni1-xCoxSeO3/Ni1-xCoxSe2 was synthesized using the precursor as a template at high temperature. Ni1-xCoxSeO3/Ni1-xCoxSe2 as a cathode for MLHBs has high reversible capacity, good cycle stability, and excellent rate performance. Ni1-xCoxSeO3/Ni1-xCoxSe2 electrode shows a high storage capacity of 426.9 mAh g-¹ and a high energy density of 296.6 Wh kg-¹ at 0.5 A g-¹, as well as an excellent rate performance of 280.0 mAh g-¹ at 2 A g-¹. After 1000 cycles at 1 A g-¹, the capacity is maintained above 205.1 mAh g-¹.

Keywords: Mg-lithium hybrid-ion batteries, hollow, nickel-cobalt carbonate, Ni1-xCoxSeO3/Ni1-xCoxSe2, excellent rate performance