Dodecaborate salt radical anion compositions and methods for making and using such compositions
AssigneeAir Products and Chemicals, Inc.
InventorsWilliam Jack Casteel, Jr., Sergei Vladimirovich Ivanov, Krishnakumar Jambunathan, Wade Hampton Bailey, III
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Abstract
The disclosure relates to new compositions comprising an, B12FxH12−x− anion that may be prepared chemically or electrochemically by oxidation of B12FxH12−x2− salts. This anion can be generated electrochemically in a voltammetry experiment, or by chemically by treatment of the (2−) anions with powerful oxidants such as XeF2 or NO2(+) salts. The new compositions can be used as 1 electron chemical oxidants and in electrochemical cells such as lithium ion batteries where their formation at elevated potential can serve to limit the upper limit of voltage during the overcharge of such a cell.
Claims18
A method for producing a composition comprising:
- exposing a salt of the formula:
- Ma+(B12FxZ12−x2−)a/2
- where x averages at least 4 but not more than 12 and Z represents H to a chemically oxidizing environment for a time and under conditions sufficient to form an oxidized salt of the formula:
- Ma+(B12FxZ12−x−)a
- wherein a is 1 to 4;
- 4≦x≦12;
- and M comprises at least one member selected from the group consisting of alkali metal, alkaline earth metal, tetraalkylammonium and imidazolium;
- and,
- combining the oxidized salt and a lithium salt of the formula:
- Li2B12FxZ12−x
- where x averages at least 4 but not more than 12 and Z represents H, Cl, Br, or OR, where R=H, or C1-8.
Dependencies are inferred from the claim text.