Preparation and Carbon Nanotube Modification of High Voltage LiNi0.5Mn1.5O4 Cathode Materials

Abstract

In this study, the nickel-manganese binary cathode material was synthesized using a high-temperature solid-state roasting method. The effects of roasting temperature and roasting time on the electrochemical performance of the cathode material was investigated. The research demonstrated that under conditions of 850°C for 12 hours, the synthesized LNMO exhibited an Fd-3m space group structure characterized. The initial discharge-specific capacity reached 135 mAh·g⁻¹ at a rate of 0.2C, while the capacity retention rate was 91.8% after 100 cycles. Following the modification with carbon nanotubes, exhibited an initial discharge capacity of 140 mAh·g⁻¹ at a rate of 0.2C, maintaining a capacity retention rate of 92.9% after 100 cycles. Carbon nanotube modification was implemented to address the poor conductivity and unstable electrochemical performance of LNMO when utilizing acetylene black as a conductive agent. This finding suggests that the unique three-dimensional conductive network formed by carbon nanotube offers superior modification effects compared to acetylene black, while the reduced quantity of conductive agent used also contributes to cost savings.