An electrochemically active nickel hydroxide material that undergoes a repetitive phase change from beta to gamma phase

摘要

A nickel hydroxide positive electrode active material which can be made by an ultrasonic precipitation method. The nickel hydroxide active material is characterized by the ability to reversibly cycle between the beta and gamma nickel hydroxide crystalline phases during electrochemical charge and discharge. The material may also be characterized by a high degree of local ordering of the hydroxyl ions.