3m Innovative Properties Company

Dahn, Jeffrey R.

Richard L Wang

William M Lamanna

Jeffrey R Dahn

Lee Moshurchak

Claudia Buhrmester

Michael J Bulinski

Phat Tan Pham

Junwei Jiang

Phat T Pham

Overcharge protection is provided for rechargeable electrochemical lithium-ion cells. The electrolyte in the provided cells contains a cyclable redox shuttle molecule that can operate in cells with high voltage cathode materials.

Redox shuttles for high voltage cathodes

A rechargeable lithium-ion cell contains a positive electrode, negative electrode, charge-carrying electrolyte containing charge carrying medium and lithium salt, and an N-substituted or C-substituted phenothiazine compound dissolved in or dissolvable in the electrolyte. The substituted phenothiazine compound has an oxidation potential above the positive electrode recharged potential and serves as a cyclable redox chemical shuttle providing cell overcharge protection.

Substituted phenothiazine redox shuttles for rechargeable lithium-ion cell

Provided is a rechargeable lithium-ion cell that contains a positive electrode, a negative electrode, a charge-carrying electrolyte containing a charge carrying medium and a lithium salt, and a triphenylamine compound dissolved in or dissolvable in the electrolyte. The triphenylamine compound has an oxidation potential above the positive electrode recharged potential and serves as a cyclable redox chemical shuttle providing cell overcharge protection. Also provided are methods for manufacturing a rechargeable lithium-ion cell.

Rechargeable lithium-ion cell with triphenylamine redox shuttle

Growing community of inventors

Halifax, Canada

Richard L Wang