| CPC H01M 8/188 (2013.01) [H01M 4/38 (2013.01); H01M 4/60 (2013.01); H01M 2300/0005 (2013.01)] | 21 Claims |
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1. An aqueous electrolyte solution comprising a redox-active compound with at least one redox-active residue of formula (I)
(X—C5H4)Fe(Y—C5H3—Z) (I),
wherein X is a residue of formula —(CnH2n)-FG or of formula —(CnH2n)-Sp-(CnH2n)-FG or of formula —(CnH2n)-Brgp-,
Y is hydrogen or a residue of formula —(CnH2n)-FG or of formula —(CnH2n)-Sp-(CnH2n)-FG,
Z is hydrogen or a covalent bond, which links the residue of formula (I) with a remainder of the compound,
FG is a functional group selected from —OH, —SH, —NO3, —NO2, —CN, —OR1, —SR1, —(O—CH2—CH2)o—OR2, —(O—CH2—CH2)o—NR3R4R5+ (Anm−)1/m, —COR2, —COO− (Katm+)1/m, —COOR2, —SO3− (Katm+)1/m, —SO3R2, —SO4− (Katm+)1/m, —SO4R2, —PO42− (Katm+)2/m, —PO4(R2)2, —PO32− (Katm+)2/m, —PO3(R2)2, —NR3R4R5+ (Anm−)1/m-N+R3R4—CtH2t—SO3− or —NR2—SO2—R3,
Brgp is a divalent bridging group which links the residue of formula (I) with the remainder of the compound,
Sp is —O—, —S—, —SO— or —SO2—,
R1 is C1-C4 alkyl,
R2 is hydrogen or C1-C4 alkyl,
R3, R4 and R5 independently of one another represent hydrogen or alkyl,
Kat is an m-valent inorganic or an organic cation,
An is an m-valent inorganic or an organic anion,
m is an integer between 1 and 4,
n represents an integer between 2 and 4,
t is an integer between 2 and 5, and
is an integer from 1 to 50,
and wherein the aqueous electrolyte solution has a temperature from 30° C. to 90° C.
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