US2012308876A1PendingUtilityA1

Rechargeable electrochemical cell

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Assignee: HAMBITZER GUENTHERPriority: Feb 12, 2010Filed: Feb 4, 2011Published: Dec 6, 2012
Est. expiryFeb 12, 2030(~3.6 yrs left)· nominal 20-yr term from priority
Inventors:Guenther HambitzerJoachim HeitbaumClaus DambachMartin KampaChristian PszollaChristiane Ripp
H01M 4/5835H01M 4/5825H01M 4/808H01M 4/136H01M 10/0525H01M 4/62H01M 2004/028H01M 4/581H01M 4/1397H01M 2300/002H01M 4/366H01M 10/0563H01M 4/0404H01M 4/58H01M 4/623H01M 4/587H01M 4/0471H01M 10/056H01M 4/0473H01M 2004/021H01M 4/0478H01M 4/0435Y02E60/10
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Claims

Abstract

The present invention relates to a rechargeable electrochemical battery cell having a housing, a positive electrode, a negative electrode, and an electrolyte, the electrolyte containing sulfur dioxide and a conductive salt of the active metal of the cell. The total quantity of oxygen-containing compounds contained in the cell that are able to react with the sulfur dioxide, reducing the sulfur dioxide, is not more than 10 mMol per Ah theoretical capacitance of the cell.

Claims

exact text as granted — not AI-modified
1 - 19 . (canceled) 
     
     
         20 . Rechargeable electrochemical battery cell having a housing, a positive electrode, a negative electrode, and an electrolyte which contains sulfur dioxide and a conductive salt of the active metal of the cell, characterized in that the total quantity of oxygen in the cell that is contained in compounds which are able to react with sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than mMol per Ah theoretical charge capacitance of the cell. 
     
     
         21 . Battery cell according to  claim 20 , characterized in that the total quantity of oxygen in the cell that is contained in compounds which are able to react with the sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than 5 mMol per Ah theoretical charge capacitance of the cell. 
     
     
         22 . Battery cell according to  claim 20 , characterized in that the total quantity of oxygen in the cell that is contained in compounds which are able to react with the sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than than 1 mMol per Ah theoretical charge capacitance of the cell. 
     
     
         23 . Battery cell according to  claim 20 , characterized in that the total quantity of oxygen in the cell that is contained in compounds which are able to react with the sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than 0.5 mMol per Ah theoretical charge capacitance of the cell. 
     
     
         24 . Battery cell according to  claim 20 , characterized in that the total quantity of oxygen in the cell that is contained in compounds which are able to react with the sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than 0.1 mMol per Ah theoretical charge capacitance of the cell. 
     
     
         25 . Battery cell according to  claim 20 , characterized in that the quantity of oxygen in the negative electrode that is contained in compounds which are able to react with the sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than 6 mMol per Ah theoretical charge capacitance of the cell. 
     
     
         26 . Battery cell according to  claim 20 , characterized in that the quantity of oxygen in the positive electrode that is contained in compounds which are able to react with the sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than 8 mMol per Ah theoretical charge capacitance of the cell. 
     
     
         27 . Battery cell according to  claim 20 , characterized in that the quantity of oxygen in the electrolyte that is contained in compounds which are able to react with the sulfur dioxide in a reaction by which the sulfur dioxide is reduced, is not more than 10 mMol per Ah theoretical charge capacitance of the cell. 
     
     
         28 . Battery cell according to  claim 20 , characterized in that, as the reaction product of the reaction by which the sulfur is reduced, a sulfur-oxygen compound is formed in which the sulfur has an oxidation level not exceeding +111, in particular a thiosulfate of the active metal of the cell. 
     
     
         29 . Battery cell according to  claim 20 , characterized in that, as the reaction product of the reaction by which the sulfur is reduced, in particularly when the cell is overcharged, a sulfur-oxygen compound is formed, which compound additionally contains a halogen and in which compound the oxidation level of the sulfur is +VI, in particular a chlorosulfonate of the active metal of the cell. 
     
     
         30 . Battery cell according to  claim 20 , characterized in that the electrolyte contains at least 1 mMol sulphur dioxide per Ah theoretical charge capacitance of the cell. 
     
     
         31 . Battery cell according to  claim 20 , characterized in that the electrolyte contains at least 5 mMol sulphur dioxide per Ah theoretical charge capacitance of the cell. 
     
     
         32 . Battery cell according to  claim 20 , characterized in that the electrolyte contains at least 10 mMol sulfur dioxide per Ah theoretical charge capacitance of the cell. 
     
     
         33 . Battery cell according to  claim 20 , characterized in that the active metal is selected from the group consisting of the alkali metals, alkaline earth metals, and metals of the second subgroup of the periodic system. 
     
     
         34 . Battery cell according to  claim 33 , characterized in that the active metal is lithium, sodium, calcium, zinc, or aluminum. 
     
     
         35 . Battery cell according to  claim 20 , characterized in that the negative electrode is an insertion electrode. 
     
     
         36 . Battery cell according to  claim 35 , characterized in that the negative electrode contains carbon. 
     
     
         37 . Battery cell according to  claim 20 , characterized in that the positive electrode contains a metal oxide or a metal halide or a metal phosphate, wherein the metal is preferably a transition metal having an atomic number from 22 to 28, most preferably the metal is nickel, manganese, or iron. 
     
     
         38 . Battery cell according to  claim 37 , characterized in that the positive electrode contains an intercalation compound. 
     
     
         39 . Battery cell according to  claim 20 , characterized in that the electrolyte contains, as the conductive salt, a halide, an oxalate, a borate, a phosphate, an arsenate, or a gallate of the active metal, preferably a tetrahalogenoaluminate of an alkali metal, further preferably a tetrachloroaluminate of an alkali metal. 
     
     
         40 . Battery cell according to  claim 20 , characterized in that the concentration of conductive salt in the electrolyte is at least 0.01 mol/1. 
     
     
         41 . Battery cell according to  claim 20 , characterized in that the concentration of conductive salt in the electrolyte is at least 0.1 mol/1. 
     
     
         42 . Battery cell according to  claim 20 , characterized in that the concentration of conductive salt in the electrolyte is at least 1 mol/1. 
     
     
         43 . Battery cell according to  claim 20 , characterized in that the concentration of conductive salt in the electrolyte is at least 5 mol/1. 
     
     
         44 . Battery cell according to  claim 20 , characterized in that the quantity of electrolyte, per Ah theoretical charge capacitance of the cell, is not more than 50 ml. 
     
     
         45 . Battery cell according to  claim 20 , characterized in that the quantity of electrolyte, per Ah theoretical charge capacitance of the cell, is not more than 20 ml. 
     
     
         46 . Battery cell according to  claim 20 , characterized in that the quantity of electrolyte, per Ah theoretical charge capacitance of the cell, is not more than 10 ml. 
     
     
         47 . Battery cell according to  claim 20 , characterized in that it contains a separator that separates the negative and positive electrodes from one another, and prevents metallic lithium deposited at the negative electrode from penetrating to the surface of the positive electrode. 
     
     
         48 . Battery cell according to  claim 20 , characterized in that it contains an isolator that separates the negative and positive electrodes from one another electrically, the isolator being formed and arranged in such a manner that active metal deposited on the negative electrode during charging of the cell may contact the positive electrode in such a manner that locally limited short-circuit reactions occur at the surface of the positive electrode.

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