Fe₂O₃nanoparticles anchored on thermally oxidized MWCNTs as anode material for lithium-ion battery

Abstract

Thermally oxidized MWCNTs (OMWCNTs) are fabricated by a thermal treatment of MWCNTs at 500℃ for 3 h in an oxygen-containing atmosphere. The oxygen content of OMWCNTs increases from 1.9 wt.% for MWCNTs to 8.3 wt.%. And the BET specific surface area of OMWCNTs enhances from 254.2 m2 g-1 for MWCNTs to 496.1 m2 g-1. The Fe2O3/OMWCNTs nanocomposite is prepared by a hydrothermal method. Electrochemical measurements show that Fe2O3/OMWCNTs still keeps a highly reversible specific capacity of 653.6 mA h g-1 after 200 cycles at 0.5 A g-1, which shows an obviously higher capacity than the sum of that of single Fe2O3 and OMWCNTs. The OMWCNTs not only buffer the volume changes of Fe2O3 nanoparticles but also provide high-speed electronic transmission channels in the charge-discharge process. The thermal oxidation method of OMWCNTs avoids using strong corrosive acids such as nitric acid and sulfuric acid, which has the advantages of safety, environmental protection, macroscopic preparation, etc.

In situ construction of N-doped Ti3C2T x confined worm-like Fe2O3 nanoparticles by Fe–O–Ti bonding for LIBs anode with superior cycle performance

“…Therefore, developing substituted anode materials with more excellent electrochemical performance have become the focus of attention. Transition metal oxides (TMOs) [5], such as Fe 2 O 3 [6][7][8][9], Fe 3 O 4 [10], TiO 2 [11], and Co 3 O 4 [7], have much higher theoretical specific capacity than graphite by conversion reaction mechanisms (M x O y + 2yLi + + 2ye − = XM0 + yLi 0 ) [12], which are considered as potential candidate materials for LIBs anode. Among all kinds of TMOs, Fe 2 O 3 has drawn considerable attention, owing to its high theoretical capacity (1007 mAh g −1 ), non-toxicity, high natural abundance, low cost, etc [13,14].…”