Self-Assembled Fe<sub>3</sub>O<sub>4</sub> Nanoparticle Clusters as High-Performance Anodes for Lithium Ion Batteries via Geometric Confinement

Lee, Soo Hong; Yu, Seung Ho; Lee, Ji Eun; Jin, Aihua; Lee, Jun Young; Jo, Hyun Hee; Shin, Kwang‐Soo; Ahn, Tae Young; Kim, Young Woon; Choe, Heeman; Sung, Yung Eun; Hyeon, Taeghwan

doi:10.1021/nl401952h

Cited by 346 publications

(252 citation statements)

References 44 publications

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“…It can be found that the CV curve of the NiO/CNTs microspheres is similar to that of NiO. In the first cycle, there are two obvious reduction peaks at about 0.95V and 0.55V, which is similar with the previous study [46]. The peak at 0.95V could be attributed to the conversion of NiO to Ni, and the peak at 0.55V should be resulted from the formation of SEI films.…”

Section: Resultssupporting

confidence: 85%

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NiO hollow microspheres interconnected by carbon nanotubes as an anode for lithium ion batteries

Cao

Chen

et al. 2016

Electrochimica Acta

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NiO hollow microspheres interconnected by carbon nanotubes as an anode for lithium ion batteries, Electrochimica Acta http://dx.doi.org/10. 1016/j.electacta.2016.07.094 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. interconnecting the NiO microspheres of the composite material, of which electronic conductivity was improved, and the mesoporous hollow structure effectively alleviated the volume changes to maintain the structural stability during cycling.

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Section: Resultssupporting

confidence: 85%

“…From the second cycle, the columbic efficiencies of the electrode are more than 97.0%, which indicates the excellent reversibility of the electrodes. It is attributed to the formation of stable SEI films during cycles due to the microsphere composed of nanoparticles second structure [46] and the coated amorphous carbon.…”

Section: Resultsmentioning

confidence: 99%

NiO hollow microspheres interconnected by carbon nanotubes as an anode for lithium ion batteries

Cao

Chen

et al. 2016

Electrochimica Acta

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“…These indicate that the 0.12 and 0.80 V plateaus most probably correspond to electrolyte decomposition and other SEI-forming processes, and that the higher voltage plateau is probably due to the ? of the first cycle in the dQ/dV curve are characteristic of the reduction of iron oxides (Fe 2 O 3 , Fe 3 O 4 ) and oxyhydroxides (FeOOH) in good agreement with which has been previously reported [23][24][25]. The electrochemical behavior of the as-deposited Fe-nanoparticles films is significantly different from that of the Fe-C films, which confirms our previous observations regarding the performance of the composite.…”

Section: Electrochemical Performancesupporting

confidence: 91%

“…Iron species such as Fe 2 O 3 , Fe 3 O 4 , and FeOOH can react electrochemically with Li ? providing extra capacity but suffering from pulverization and side reactions with the electrolyte [23][24][25]. Fe-C nano-composites (Fig.…”

Section: Electrochemical Performancementioning

confidence: 99%

Processing nanoparticle–nanocarbon composites as binder-free electrodes for lithium-based batteries

Baloch

Kubiak

Roddatis

et al. 2017

Mater Renew Sustain Energy

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The processing of battery materials into functional electrodes traditionally requires the preparation of slurries using binders, organic solvents, and additives, all of which present economic and environmental challenges. These are amplified in the production of nanostructured carbon electrodes which are often more difficult to disperse in slurries and require more energy-intensive and longer processing. In this study we demonstrate a new process for preparing binder-free nanocarbon/nanoparticle (Fe-C) composite electrodes and study the effect of processing on the nanocomposite's cycling performance in lithium cells. The binder-free electrodes were prepared by a two-step method: pulsed-electrodeposition of iron-based catalyst followed by chemical vapor deposition of a carbon film. SEM and TEM of the Fe-C showed that the active materials have a fibrous and tortuous morphology with disordered nanocrystalline domains characteristic of an amorphous carbon. The Fe-C electrodes showed good mechanical stability and an excellent cycle performance with an average stable capacity of 221 mAhg -1 , and 85% capacity retention for up to 50 cycles. By reducing the number of processing steps and eliminating the use of binders and other chemicals this new method offers a ''greener'' alternative than current processing methods. Graphical abstractSynopsis: gains in sustainability can be achieved by eliminating use of binders, chemicals, and the number of electrode's processing steps in this new method.

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“…Their unique structures endow them with interesting properties, which promise diverse applications such as controlled delivery and release [6,7], magnetic separation [8,9], dye sensitized solar cells [10], lithium ion batteries [11,12], and noble metal catalysts [13]. To date, there are several methods to fabricate SPs in literature.…”

mentioning

confidence: 99%

Byproduct-induced in-situ formation of gold colloidal superparticles

Ang

Luo

et al. 2015

Sci. China Mater.

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ing about them is not complete yet. Herein, we report a new phenomenon where monodisperse gold SPs (AuSPs, Scheme 1) were formed in-situ in the synthetic solution of gold NPs (AuNPs), when a special type of thiol ligands was used. These ligands feature a structure consisting of a tetraethylene glycol (TEG) chain with the two terminal hydroxyl groups replaced by a thiol group and a hydrocarbon segment respectively (HS-TEG-hydrocarbon, Scheme 1). Briefly, to a tetrahydrofuran (THF) solution containing the ligand and gold (III) chloride was injected a reducing agent t-butylamine borane (TBAB) that induced the formation of monodisperse AuNPs. Then, these AuNPs spontaneously aggregated to form AuSPs. Further investigation revealed that a byproduct, t-butylamine hydrochloride, generated from the redox reaction played a key role in the formation of AuSPs.THF was used as a solvent, which can dissolve both HAuCl 4 and TBAB, so the reaction occurred in a singlephase system. HS-TEG-adamantane was the first ligand that we used. Upon the injection of TBAB/THF solution, monodisperse AuNPs (sample obtained after 30 s reaction, 8.0 nm in diameter, see Figs 1a and S1a in the Supplementary information (SI)) were formed quickly during the nucleation process, which is similar to other synthetic systems. However, the difference was that these AuNPs began to aggregate in solution in the following few minutes if no purification step was applied, as indicated by the UV-vis spectra (Fig. 1a). Transmission electron microscopy (TEM, Figs 1b and c) and scanning electron microscopy (SEM, Fig. S2) images show that these AuNP aggregates (i.e., AuSPs) adopt a spherical morphology and are relatively uniform in size. Within these AuSPs, single AuNPs pack closely, the crystalline structure of which was confirmed by selected area electron diffraction (SAED, Fig. 1d). The formation of spherical assemblies is consistent with the emergence of the two absorption bands located at 549 and 630 nm in UV-vis Current work presents a simple and efficient method for the preparation of gold superparticles. The self-assembly of gold nanoparticles into colloidal superparticles was realized in-situ during the preparation of nanoparticles when a type of thiol molecules were used as ligands. Further investigation reveals that t-butylamine hydrochloride, an ionic byproduct generated during the redox reaction of precursors, plays a key role in the formation of gold superparticles. The polarity of monolayers made from these ligands on the nanoparticle surface allows the interaction of nanoparticles and the ionic byproduct, which is indispensable for the superparticle formation.Superparticles (SPs) are colloidal assemblies of inorganic nanoparticles (NPs) [1−5]. Their unique structures endow them with interesting properties, which promise diverse applications such as controlled delivery and release [6,7], magnetic separation [8,9], dye sensitized solar cells [10], lithium ion batteries [11,12], and noble metal catalysts [13]. To date, there are several methods to fabr...

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Self-Assembled Fe₃O₄ Nanoparticle Clusters as High-Performance Anodes for Lithium Ion Batteries via Geometric Confinement

Cited by 346 publications

References 44 publications

NiO hollow microspheres interconnected by carbon nanotubes as an anode for lithium ion batteries

NiO hollow microspheres interconnected by carbon nanotubes as an anode for lithium ion batteries

Processing nanoparticle–nanocarbon composites as binder-free electrodes for lithium-based batteries

Byproduct-induced in-situ formation of gold colloidal superparticles

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Self-Assembled Fe3O4 Nanoparticle Clusters as High-Performance Anodes for Lithium Ion Batteries via Geometric Confinement

Cited by 346 publications

References 44 publications

NiO hollow microspheres interconnected by carbon nanotubes as an anode for lithium ion batteries

NiO hollow microspheres interconnected by carbon nanotubes as an anode for lithium ion batteries

Processing nanoparticle–nanocarbon composites as binder-free electrodes for lithium-based batteries

Byproduct-induced in-situ formation of gold colloidal superparticles

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Self-Assembled Fe₃O₄ Nanoparticle Clusters as High-Performance Anodes for Lithium Ion Batteries via Geometric Confinement