Defective mesoporous Li4Ti5O12−y: An advanced anode material with anomalous capacity and cycling stability at a high rate of 20 C

► Defective mesoporous Li4Ti5O12−y was first synthesized. ► Defective Li4Ti5O12−y exhibited an improved electronic conductivity. ► Defective Li4Ti5O12−y showed high capacity and excellent cycling stability at 20 C. ► The resulting long-term electrochemical performance is barely accessible at 20 C.