Chemical overcharge protection of lithium and lithium-ion secondary batteries
AssigneeEIC Laboratories, Inc.
InventorsKuzhikalail M. Abraham, James F. Rohan, Conrad C. Foo, David M. Pasquariello
Life of this patent
Estimating the term…
Abstract
This invention features the use of redox reagents, dissolved in non-aqueous electrolytes, to provide overcharge protection for cells having lithium metal or lithium-ion negative electrodes (anodes). In particular, the invention features the use of a class of compounds consisting of thianthrene and its derivatives as redox shuttle reagents to provide overcharge protection. Specific examples of this invention are thianthrene and 2,7-diacetyl thianthrene. One example of a rechargeable battery in which 2,7-diacetyl thianthrene is used has carbon negative electrode (anode) and spinet LiMn.sub.2 O.sub.4 positive electrode (cathode).
Claims21
An electric current producing, rechargeable, electrochemical cell having an anode, a cathode and an electrolyte in contact with said anode and cathode, said electrolyte containing thianthrene or a derivative of thianthrene as a redox shuttle reagent to provide overcharge protection to the cell.
A method for providing a rechargeable, electrochemical cell, comprising the steps of
- providing an anode and a cathode,
- providing an electrolyte in contact with said anode and said cathode;
- and
- dissolving within said electrolyte a thianthrene based compound for acting as a redox shuttle reagent to provide overcharge protection to the cell.
Dependencies are inferred from the claim text.