Papers by Author: Jun Biao Lu

Abstract: Here the spinel Li4Ti5O12/C composites were prepared by a modified high temperature solid-state reaction. The as prepared Li4Ti5O12/C composites showed enhanced electrochemical lithium insertion performance in reversible capacity and rate capabilities. The improved electrochemical properties are attributed to the reduced grain size and the improved electronic conductivity caused by the pyrolytic carbon incorporated into the spinel Li4Ti5O12 particle. The spinel Li4Ti5O12/C composites with improved electrochemical properties may find versatile applications in various energy storage devices.

Abstract: LiFePO4/Carbon composite cathode material was prepared by pelleting and subsequent pyrolytic cracking process in N2 atmosphere with carbon source of polyvinyl alcohol (PVA). XRD crystal analysis indicates that single LiFePO4 phase and amorphous carbon can be found in the products. SEM observation shows a special micro-morphology of sample, which is favorable for enhancement of electrochemical properties. The discharge capacity of the LiFePO4/C composite was 135 mAh/g, close to the charge capacity of 153 mAh/g at low rate of 0.1C. At 0.2C, the specific capacity was about 117.4 mAh/g, which is satisfied for power source of Electric Vehicle for its flat discharge platform.

Abstract: LiFePO4 powder was obtained by sol-gel processing and was characterized by SEM, XRD, TEM, and surface area measurement of Quantachrome NOVA Automated Gas Sorption system. The cathode performance was evaluated using cylindrical battery. Cycle at C/10, samples sintered at 850°C with specific surface area of 188.5M2/g deliver capacity of 157.5mAh/g and cycle dozens of times without obvious capacity fade.