リチウム／二酸化マンガン一次電池の保存特性に及ぼす正極からの溶出Mn成分の影響について

doi:10.5796/electrochemistry.62.1074

Cited by 4 publications

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“…Generally, Na-based batteries contain liquid electrolytes using NaPF 6 or NaClO 4 as salts and propylene carbonate or ether-based solvents. 4,5 These electrolyte solvents undergo reductional decomposition at potentials close to that of Na and form a passive film on the electrode during discharge, which can reduce the available capacity because of its oxidation during the charging process. 6 Unfortunately, although ionic liquid-based electrolyte solutions have high electrochemical stability, they react with Na metal, contributing to decomposition of the electrolyte.…”

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Analysis of Ionic Transport and Electrode Interfacial Reaction, and NMR One-Dimensional Imaging of Ether-Based Polymer Electrolytes

Hiraoka

Inoue

Takahashi

et al. 2021

J. Electrochem. Soc.

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Polyether-based polymer electrolytes containing an M x [N(SO2CF3)2] salt (x = 1 for Li and Na, 0.5 for Mg and Ca) were investigated for their thermal stabilities and ionic conductivities, owing to their high electrochemical stability and interfacial compatibility at electrodes as the electrolyte layer of all-solid-state batteries. The properties of an electrolyte / Na metal electrode interface were also explored. The thermal stability and ionic conductivity exhibited a strong correlation with the Coulombic interaction energy originating from cationic-radii and charge density derived from the cation’s valance number. The ionic conductivity of random copolymers of poly(ethyleneoxide) and poly(propyleneoxide) (P(EO/PO)) electrolytes increased slightly with decreasing cationic radii and decreased appreciably with valence number. In the [metallic electrode ∣ polymer electrolyte ∣ metallic electrode] cells, the interfacial resistances and their apparent activation energies at the polymer electrolyte / metallic electrode interfaces tended to be higher for the Na systems than for the Li systems. The calculated Na+ transport number exhibited a local maximum value when [Na]/[O] ∼0.04. To further evaluate the diffusive properties of active ions, nuclear magnetic resonance one-dimensional imaging was performed. The self-diffusion coefficient of TFSA was confirmed to correspond to the valence number of cation in the P(EO/PO)-M x [N(SO2CF3)2] electrolytes.

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