Aqueous secondary battery
AssigneeSeoul National University R&Db Foundation
InventorsKisuk Kang, Myeong Hwan Lee, Sung Joo Kim
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Abstract
An aqueous secondary battery including: a positive electrode; a negative electrode; a separator; and an aqueous electrolytic solution including water and a metal salt represented by Chemical Formula 1 AxDy and having molality of about 5 M to about 40 M wherein in Chemical Formula 1, A is at least one metal ion selected from a sodium ion, a potassium ion, a magnesium ion, a calcium ion, a strontium ion, a zinc ion, or a barium ion, D is at least one type of atomic group ion selected from Cl−, SO42−, NO3−, ClO4−, SCN−, CF3SO3−, C4F3SO3−, (CF3SO2)2N−, AlO2−, AlCl4−, AsF6−, SbF6−, BR4−, and PO2F2−, and 0<x≤2, and 0<y≤2.
Claims7
An aqueous secondary battery as a sodium secondary battery comprising
- a positive electrode comprising at least one positive active material selected from the group consisting of Na4Fe3(PO4)2(P2O7), Na4MnFe2(PO4)2(P2O7), Na4Mn2Fe(PO4)2(P2O7) and Na4Mn3(PO4)2(P2O7);
- a negative electrode comprising at least one negative active material selected from the group consisting of a sodium metal, a sodium metal based alloy, and a sodium insertion compound;
- a separator;
- and
- an aqueous electrolyte solution comprising water and NaClO4 and having molality greater than 10 m to 40 m,
- wherein the aqueous electrolyte solution comprises a crystalline hydrate, and the crystalline hydrate comprises a portion of a sodium ion and a perchlorate ion from NaClO4 that constitutes a coordination with water molecules, and
- wherein the sodium ion and the perchlorate ion forming the crystalline hydrate is in form of solvent-separated ion pairs, contact ion pairs and aggregated cation-anion pairs, and a mole fraction of the contact ion pairs relative to the aggregated cation-anion pairs is greater than or equal to about 50% based on a total amount of the sodium ion and the perchlorate ion that are ionized in the aqueous electrolyte solution.
Dependencies are inferred from the claim text.