Patent EP-2360772-A1 (EP)
Inventor: HAMBITZER GUENTHER
IPC: H01M10/052
Filed: 2010-02-12
Abstract: The rechargeable electrochemical battery cell comprises housing, positive electrode, negative electrode, and electrolyte which contains sulfur dioxide and conducting salt of active metal of the cell. The total amount of oxygen-containing compounds, which are contained in the cell and react with sulfur dioxide under reducing sulfur dioxide, is 0.1 mMol per Ah theoretical capacity of the cell. The amount of oxygen compounds, which are contained in the negative electrode and react with sulfur dioxide under reducing sulfur dioxide, is less than 6 mMol per Ah theoretical capacity of the cell. The rechargeable electrochemical battery cell comprises housing, a positive electrode, a negative electrode, and an electrolyte which contains sulfur dioxide and a conducting salt of the active metal of the cell. The total amount of the oxygen-containing compounds, which are contained in the cell and react with sulfur dioxide under the reduction of the sulfur dioxide, is 0.1 mMol per Ah theoretical capacity of the cell. The amount of oxygen compounds, which are contained in the negative electrode and react with sulfur dioxide under the reduction of the sulfur dioxide, is less than 6 mMol per Ah theoretical capacity of the cell. The amount of oxygen compounds, which are contained in the positive electrode and react with sulfur dioxide under the reduction of the sulfur dioxide, is less than 8 mMol per Ah theoretical capacity of the cell. The amount of oxygen compounds, which are contained in the electrolyte and react with sulfur dioxide under the reduction of the sulfur dioxide, is less than 10 mMol per Ah theoretical capacity of the cell. A sulfur-oxygen-compound, in which the sulfur contains the oxidation step of maximum +III that is thiosulfate of the active metal of the cell, is formed as reaction product of the reaction, by which the sulfur dioxide is reduced. The sulfur-oxygen-compound, in which the oxidation step of the sulfur +IV is chlorosulfonate of the active metal of the cell, additionally contains halogen and is formed as reaction product of the reaction, by which the sulfur dioxide is reduced during over-loading the cell. The electrolyte per Ah theoretical capacity of the cell contains less than 10 mMol of sulfur dioxide. The active material consists of alkali metals, earth alkali metals and metals of second sub-group of the periodic system. The negative electrode is an insertion electrode and contains carbon. The positive electrode contains an intercalation compound. The concentration of conducting salt in the electrolyte is 5 mol/l. The battery cell includes a separator, which separates the negative electrode and the positive electrode from each other and penetrates the passage of metallic lithium deposited on the negative electrode to a surface of the positive electrode, and an insulator, which electrically separates the negative electrode from the positive electrode, where the insulator is designed, so that the active metal deposited on the negative electrode contacts with the positive electrode during loading the cell such that the locally limited short-circuit reactions occur on the surface of the positive electrode.