Synthesis, structural and electrochemical characterizations of the sol–gel birnessite MnO1.84·0.6H2O

A sodium layered manganese oxides as 3V cathode materials for secondary lithium batteries

“…Same values of the Warburg prefactor A have been found for the pristine material and its ABMO form, allowing to cal- culate a value of ≈5 × 10 −10 cm 2 s −1 for the apparent chemical diffusion coefficient of lithium ions. Such a value is consistent with the kinetics of Li transport reported in various MnO 2 structures [28][29][30]. The same limiting frequency f l ≈ 5 × 10 −3 Hz (≈D Li /L 2 ) is found in both cases showing the kinetics for Li transport into ␣-Na 0.66 MnO 2.13 and AB-␣-Na 0.66 MnO 2.13 is the same.…”

Charge insertion into hybrid nanoarchitectures: mesoporous manganese oxide coated with ultrathin poly(phenylene oxide)

“…Because the polymer functions as a semipermeable membrane [19], the polymer component can limit access of molecules, solvent, or reactants to the oxide surface. For rechargeable Li-ion battery applications, the polymer coating may limit the formation of a solid electrolyte interface layer [5] by controlling solvent access to the electrode surface and may also protect against Mn dissolution, as has been observed during cycling of spinel LiMn 2 O 4 [34]. By using a polymer that is ionically conducting as well as electronically insulating, the electrodeposited film can function as a solid electrolyte [30].…”

“…Sol-gel-derived lamellar birnessite-type MnO 2 nanoarchitectures exhibit high capacities at fast charge/discharge rates as Li + -insertion electrodes [4][5][6]. The functionality of these architectures can be expanded by coating an ultrathin polymer directly on the electrode surface while maintaining the mesoporosity necessary for rapid transport of solvent and ions into the architecture through the interconnected pores [7].…”

A novel chemical synthesis of Mn3O4 thin film and its stepwise conversion into birnessite MnO2 during super capacitive studies

“…Various methods have been developed to synthesize birnessitetype MnO 2 including sol-gel reactions [8], calcinations [9], and hydrothermal decomposition of a LiMnO 4 , NaMnO 4 or KMnO 4 precursor [10]. Layered birnessite MnO 2 can also be synthesized by electrochemical method [11].…”