“…Owing to the demand for large-scale storage systems and the substitution of flammable, toxic, and expensive organic electrolytes, the research for stable electrode materials in an aqueous environment has received much attention [3,6,20,[23][24][25][26][27][28]. In this sense, spinel LiMn 2 O 4 has been extensively used as cathode material for Li-ion batteries, either using organic or aqueous electrolytes [29][30][31][32][33][34][35][36][37][38]. The major advantage of LiMn 2 O 4 is its abundance and subsequent low cost.…”