Electrochemical behavior and structural change of spinel-type Li[LixMn2−x]O4 (x=0 and 0.2) in sodium cells

摘要: Abstract Electrochemical behavior of spinel-type Li[Li x Mn 2− ]O 4 samples is examined in sodium containing non-aqueous electrolyte solution. Li ions stoichiometric LiMn 2 O sample are electrochemically extracted solution, forming (  = 0.1) by first oxidation process. Sodium inserted into the lithium spinel phase, which results phase transition. From structural analysis X-ray diffraction and transition cells, it found that an original part converts a layered Na y MnO . Thus prepared can deliver approximately 190–200 mAh g −1 reversible capacity with relatively good retention as positive electrode materials for rechargeable batteries. Nonstoichiometric Li-rich manganese spinel, 0.2 1.8 , also accommodates ions, similarly to phase. However, not observed. Instead, insertion induces strain crystal lattice.