Sea-Sponge-like Structure of Nano-Fe₃O₄ on Skeleton-C with Long Cycle Life under High Rate for Li-Ion Batteries

Abstract

To meet the demands of long cycle life under high rate for lithium-ion batteries, the advancement of anode materials with stable structural properties is necessarily demanded. Such promotion needs to design reasonable structure to facilitate the transportation of electron and lithium ions (Li). Herein, a novel C/FeO sea-sponge-like structure was synthesized by ultrasonic spray pyrolysis following thermal decomposition process. On the basis of sea-sponge carbon (SSC) excellences in electronic conductivity and short Li diffusion pathway, nano-FeO anchored on stable SSC skeleton can deliver high electrochemical performance with long cycle life under high rate. During electrochemical cycling, well-dispersed nano-FeO in ∼6 nm not only averts excessive pulverization and is enveloped by solid electrolyte interphase film, but also increases Li diffusion efficiency. The much improved electrochemical properties showed a capacity of around 460 mAh g at a high rate of 1.5C with a retention rate of 93%, which is maintained without degradation up to 1000 cycles (1C = 1000 mA g).

Synthesis of Mesoporous Fe2SiO4/C Nanocomposites and Evaluation of Their Performance as Materials for Lithium‐Ion Battery Anodes

“…In recent years, a number of anode materials including carbon based materials, Si based materials, metal salts as well as transitional metal oxides, have been widely investigated as the potential anode materials for LIBs. In particular, transitional metal silicates such as Zn 2 SiO 4 ,, Mn 2 SiO 4 , Co 2 SiO 4 and Fe 2 SiO 4 , have attracted extensive attentions for lithium ion battery anode owing to their high capacity, low cost and eco‐friendliness.…”

Designation of a Nano‐Fe3O4 Based Composite Electrode with Long Cycle Life for Lithium‐Ion Batteries

“…The high‐resolution X‐ray photoelectron spectrum of Fe 2p shows two peaks at 726.4 and 711.5 eV, which are assigned to Fe 2p1/2 and 2p3/2 orbitals, respectively. Additionally, the existence of satellite peak at ∼720 eV eliminates the presence of Fe 2 O 3 , which is considered as a significant characteristic peak to distinguish between Fe 3 O 4 and α‐Fe 2 O 3 . The split peaks at the BE values of 720, 711.4 eV and 726.4, 713.5 eV are responsible to Fe 2+ and Fe 3+ , respectively.…”

“…Most of the nanoparticles are spherical with 2–10 nm in diameter and a few are spherical and rod‐shaped among 100–200 nm. Smaller nanoparticles are prospected to reduce the lithium ion transport distance and greatly reduce the probability of crushing due to expansion . In this work, the material designed can stabilize 2500 cycles at high current density and has a reversible capacity of 1060.7 mAh g −1 , which exhibits excellent rate performance.…”

Bioinspired sea-sponge nanostructure design of Ni/Ni(HCO3)2-on-C for a supercapacitor with a superior anti-fading capacity

“…The S-PCS with interconnected channels and large specific surface areas was synthesized by ultrasonically spraying pyrolysis, which provides a rigid support to disperse Ni(HCO 3 ) 2 . 36,37 During the synthesis process, the OHspecies produced by urea hydrolysis react with Ni 2+ to form an ultrathin Ni(OH) 2 film. The HCO 3 -, generated from CO 2 hydrolysis process, reacts with Ni(OH) 2 to form Ni(HCO 3 ) 2 nanoflakes (see Step I in Fig.…”