Rechargeable electrochemical cell
A rechargeable electrochemical battery cell with a housing, a positive electrode, a negative electrode and an electrolyte which contains SO 2 and a conducting salt of the active metal of the cell, whereby at least one of the electrodes contains a binder chosen from the group: Binder A, which consists of a polymer, which is made of monomeric structural units of a conjugated carboxylic acid or of the alkali salt, earth alkali salt or ammonium salt of this conjugated carboxylic acid or a combination thereof or binder B which consists of a polymer based on monomeric styrene structural units or butadiene structural units or a mixture of binder A and B.
1. A rechargeable electrochemical battery cell having a housing, a positive electrode, a negative electrode and an electrolyte containing SO 2 and a conductive salt of the active metal of the cell, wherein the electrolyte contains at least 1.5 mole SO 2 per mole conductive salt, wherein at least one electrode contains a binder comprising a polymer built up from monomeric structural units of an alkali salt of acrylic acid, wherein the binder is present in an amount effective to reduce capacity loss and no more than 10 wt %.
2. The battery cell according to claim 1 , wherein the electrodes comprising the binder are the negatives electrodes of the cell.
3. The battery cell according to claim 1 , wherein at least one of the electrodes contains an additional and different binder.
4. The battery cell according to claim 1 , wherein at least one of the electrodes has a current collector element with a three-dimensional porous metal structure.
5. The battery cell according to claim 4 , wherein the porous metal structure extends essentially over the entire thickness of the electrode.
6. The battery cell according to claim 4 , wherein the active metal is distributed essentially homogeneously in the positive metal structure.
7. The battery cell according to claim 1 , wherein the positive electrode has a thickness of at least 0.25 mm.
8. The battery cell according to claim 1 , wherein the positive electrode has a thickness of at least 0.25 mm and a maximum thickness of 2.0 mm.
9. The battery cell according to claim 1 , wherein the negative electrode has a thickness of at least 0.2 mm.
10. The battery cell according to claim 1 , wherein the negative electrode has a thickness of at least 0.2 mm and a maximum thickness of 1.5 mm.
11. The battery cell according to claim 1 , wherein the active metal is selected from the group consisting of alkali metals, alkaline earth metals, metals in the subgroup 12 of the periodic system and aluminum.
12. The battery cell according to claim 11 , wherein the active metal is lithium, sodium, calcium, zinc, or aluminum.
13. The battery cell according to claim 1 , wherein the negative electrode is an insertion electrode.
14. The battery cell according to claim 13 , wherein the negative electrode contains carbon.
15. The battery cell according to claim 1 , wherein the positive electrode contains a metal oxide or a metal halide or a metal phosphate.
16. The battery cell according to claim 15 , wherein the positive electrode contains an intercalation compound.
17. The battery cell according to claim 16 , wherein the positive electrode contains lithium iron phosphate.
18. The battery cell according to claim 1 , wherein the electrolyte contains a halide, an oxalate, a borate, a phosphate, an arsenate, or a gallate of the active metal, as the conductive salt.