Carbon Nanofiber/Na3V2(PO4)2F3 Particle
Composites as a Self-Standing
Cathode for High-Voltage Flexible Sodium-Ion Batteries
Version 2 2023-11-24, 00:20Version 2 2023-11-24, 00:20
Version 1 2023-11-24, 00:20Version 1 2023-11-24, 00:20
online resource
posted on 2023-11-24, 00:20authored byMin Liang, Wenya Li, Yuanqi Yang, Huizi Li, Jinji Liang, Chenhan Lin, Xiangcong Meng, Jun Liu, Zhicong Shi, Liying Liu
Smart wearable electronic devices
are becoming more prevalent
in
our daily life, exceedingly arousing the increasing demand for flexible
energy storage devices. Herein, a sodium superionic conductor (NASICON)-structured
Na3V2(PO4)2F3 (NVPF) self-standing cathode is fabricated via an electrospinning
technique. NVPF particles at the nanoscale are encapsulated in or
attached to the surface of carbon nanofibers to form an NVPF self-standing
cathode, which exhibits a high-voltage platform of ∼4.07 V
with a reversible capacity of 101.8 mAh g–1 at 0.2C
and 98.3% capacity retention after 400 cycles. Moreover, the soft
package full battery, assembled with an NVPF self-standing cathode
and a Na3V2(PO4)3 (NVP)
anode, can light up a light-emitting diode in the folded/unfolded
states. The superior sodium storage performance was enabled by the
stable structure of the NVPF self-standing cathode. Moreover, the
nitrogen-doped carbon nanofiber network of the NVPF self-standing
cathode not only ensures the flexibility but also facilitates electron
and Na+ transportation. This work provides an NVPF self-standing
cathode with excellent mechanical and electrochemical performance
for high-voltage flexible sodium-ion batteries, which is beneficial
for promoting the practical application of high-voltage flexible sodium-ion
batteries.