| 摘要 |
The present invention relates to a rechargeable electrochemical cell comprising
(a) at least one anode (a),
(b) at least one gas diffusion electrode (b) comprising at least one porous support,
(c) at least one non-porous metal-ion conducting separator assembly (c) placed between anode (a) and gas diffusion electrode (b), and
(d) at least one composition (d) being in contact with the gas diffusion electrode (b), wherein the composition (d) comprises
(d1) at least one aprotic organic solvent (d1),
(d2) at least one metal salt (d2), and
(d3) at least one redox active compound (d3), wherein the concentration of the redox active compound (d3) in the composition (d) is in the range from 100 to 5000 mmol/l,
wherein any contact of composition (d) with anode (a) is prevented by hermetically sealing these components from each other. The present invention further relates to a specific composition (d) comprising
(d1) at least one aprotic organic solvent (d1),
(d2) at least one metal salt (d2), and
(d3) at least one redox active compound of general formula (I),
wherein
R 1 ,
R 2 are independently from each other selected from H and an organic radical having from 1 to 40 carbon atoms,
X 1
is CR 5 R 5a or a nitroxyl radical group N-O·,
X2
is CR 6 R 6a or a nitroxyl radical group N-O·,
X3
is CR 7 R 7a or a nitroxyl radical group N-O·,
X 4
is CR 8 R 8a or a nitroxyl radical group N-O·,
X 5
is CR 9 R 9a or a nitroxyl radical group N-O·,
R 3 ,
R 4 , R 5 , R 5a , R 6 , R 6a R 7 , R 7a , R 8 , R 8a , R 9 , R 9a are independently from each other selected from H and an organic radical having from 1 to 40 carbon atoms,
or two adjacent radicals of the group of radicals consisting of R 1 , R 2 , R 3 , R 4 , R 5 , R 5a , R 6 , R 6a R 7 , R 7a , R 8 , R 8a , R 9 and R 9a together with the atoms connecting them form a monocyclic or polycyclic, substituted or unsubstituted, aliphatic or aromatic ring system which has from 4 to 40 carbon atoms and can also comprise heteroatoms selected from the group consisting of the elements Si, Ge, N, P, O, S, Se and Te,
and relates to rechargeable electrochemical cells comprising said specific composition (d). |
