A different method for producing a flexible LiMn_2O_4/MWCNT composite electrode for lithium ion batteries

摘要

A flexible lithium manganese oxide (LiMn_2O_4)/ multi-wall carbon nanotube (MWCNT) composite electrode was produced by casting a slurry-containing powdered LiMn_2O_4 on a previously prepared MWCNT paper. The structure of this new LiMn_2O_4/MWCNT composite electrode was characterized using scanning electron microscopy and X-ray diffraction patterns. Furthermore, the surfaces of these electrodes were coated with gold–palladium alloy using an RF magnetron sputtering technique to prevent Mn dissolution. To investigate the electrochemical performance of this flexible LiMn_2O_4/MWCNT composite electrode, a bare-LiMn_2O_4 electrode was prepared. The discharge capacity of the produced LiMn_2O_4/MWCNT nanocomposite electrode was cyclically tested, and the charge transfer resistance of the electrodes was studied using electrochemical impedance spectroscopy. Consequently, the Au–Pdcoated LiMn_2O_4/MWCNT had a 120 mAh g~(-1) discharge capacity and 90 % capacity retention after 100 cycles.