Breaking Limits of Li-Ion Batteries with High-Voltage Spinel LiNi 0.5 Mn 1.5 O 4 Nanofiber/Carbon Nanotube Composite Cathodes

Na-Yeong Kim, Min Kyoung Gi,Zubair Ahmed Chandio, Jeong-Ho Park,Jun Young Cheong,Ji-Won Jung

Korean Journal of Chemical Engineering(2024)

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Spinel-structured LiNi 0.5 Mn 1.5 O 4 (LNMO), which is used as a cathode material for lithium-ion batteries, offers economic and eco-friendly advantages, as it operates at a high voltage of 5 V and does not require expensive cobalt. However, challenges such as low electronic conductivity and volume changes due to phase transitions during charging and discharging at 3 V or lower persist, resulting in capacity degradation. In this study, LNMO nanofibers were created using the electrospinning method to tackle the volume expansion issue and maintain structural integrity of the material. In addition, the electrode was constructed with carbon nanotubes as a conductive material to improve electronic conductivity. Electrochemical evaluations showed that LNMO nanofibers combined with carbon nanotubes exhibited a higher capacity and outstanding cyclability compared to LNMO powder.
LiNi0.5Mn1.5O4,Nanofibers,Carbon nanotubes,Electrospinning,Li-ion batteries
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