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Journal ArticleDOI: 10.1039/D0NR09228B

MXene-encapsulated hollow Fe3O4 nanochains embedded in N-doped carbon nanofibers with dual electronic pathways as flexible anodes for high-performance Li-ion batteries.

04 Mar 2021-Nanoscale (Royal Society of Chemistry (RSC))-Vol. 13, Iss: 8, pp 4624-4633
Abstract: Fe3O4 is one of the promising anode materials in Li-ion batteries and a potential alternative to graphite due to the high specific capacity, natural abundance, environmental benignity, non-flammability, and better safety. Nevertheless, the sluggish intrinsic reaction kinetics and huge volume variation severely limit the reversible capacity and cycling life. In order to overcome these hurdles and enhance the cycling life of Fe3O4, a one-dimensional (1D) nanochain structure composed of 2D Ti3C2-encapsulated hollow Fe3O4 nanospheres homogeneously embedded in N-doped carbon nanofibers (Fe3O4@MXene/CNFs) is designed and demonstrated as a high-performance anode in Li-ion batteries. The distinctive 1D nanochain structure not only inherits the high electrochemical activity of Fe3O4, but also exhibits excellent electron and ion conductivity. The Ti3C2 layer on the Fe3O4 hollow nanospheres forms the primary electron transport pathway and the N-doped carbon nanofiber network provides the secondary transport pathway. At the same time, Ti3C2 flakes partially accommodate the large volume change of Fe3O4 during Li+ insertion/extraction. Density functional theory (DFT) calculations demonstrate that the Fe3O4@MXene/CNFs electrode can efficiently enhance the adsorption of Li+ to promote Li+ storage. As a result of the electrospinning process, self-restacking of Ti3C2 flakes and aggregation of Fe3O4 nanospheres can be prevented resulting in a larger surface area and more accessible active sites on the flexible anode. The Fe3O4@MXene/CNFs anode has remarkable electrochemical properties at high current densities. For example, a reversible capacity of 806 mA h g−1 can be achieved at 2 A g−1 even after 500 cycles, corresponding to an area specific capacity of 1.612 mA h cm−2 at 4 mA cm−2 and a capacity as high as 613 mA h g−1 is retained at 5 A g−1, corresponding to an area capacity of 1.226 mA h cm−2 at 10 mA cm−2. The results indicate that the Fe3O4@MXene/CNFs anode has excellent properties for Li-ion storage.

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Topics: Anode (55%), Carbon nanofiber (52%), Nanofiber (50%)
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7 results found


Journal ArticleDOI: 10.1021/ACSAEM.1C01171
Chenyang Li1, Dongdong Zhang2, Jin Cao2, Pengfei Yu1  +4 moreInstitutions (3)
23 Aug 2021-
Topics: Lithium (64%), Anode (58%)

1 Citations


Journal ArticleDOI: 10.1080/15583724.2021.1972006
Deepika Sharma1, Bhabani K. Satapathy1Institutions (1)
30 Aug 2021-Polymer Reviews
Abstract: The ongoing demand for the development of intelligent devices has greatly inspired the development of metallic nanostructure incorporated composite electrospun mats. The astounding characteristics ...

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Topics: Electrospinning (52%)

1 Citations


Journal ArticleDOI: 10.1016/J.CERAMINT.2021.06.015
Jian Song1, Yelin Ji1, Yuexian Li1, Ximing Lu1  +4 moreInstitutions (3)
Abstract: Herein, to efficiently improve the lithium storage of Fe3O4 nanoparticles, a distinctive porous carbon (PC) assisted carbon nanotubes (CNTs) supporting architecture has been designed and fabricated successfully. The Fe3O4 nanoparticles are deposited on the surface of CNTs and then covered by an extra PC. In such a designed architecture, highly conductive and robust CNTs can not only improve the conductivity but also boost the structure of the as-fabricated Fe3O4-based composite (CNTs@Fe3O4@PC). In particular, the foam-like PC has a certain level of volume elasticity and open tunnel-like structure to better anchor the Fe3O4 nanoparticles on the surface of CNTs and facilitate the transfer of electrons and ions, therefore guaranteeing the fast kinetics and long-term stability. The results show that the capacitive contribution is predominant in lithium storage of the CNTs@Fe3O4@PC electrode. Consequently, the as-fabricated CNTs@Fe3O4@PC shows high capacity, good rate capability, and long life, displaying 766 and 572 mAh g-1 after 400 and 700 cycles at 200 and even 1000 mA g-1, respectively. Thus outstanding performance makes the CNTs@Fe3O4@PC have great potential to be advanced lithium-ion battery anode materials. Furthermore, this strategy can be extended to other nanostructured metal oxide anodes, such as CoO, SnO2, and Bi2O3 nanomaterials.

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Topics: Carbon nanotube (56%), Lithium (52%), Nanomaterials (52%)

1 Citations


Open accessDOI: 10.1021/ACSAEM.1C02383
Huan Liu1, Weibin Zhang1, Zehao Guan1, Na Li1  +5 moreInstitutions (2)
26 Oct 2021-
Abstract: MnO, as a promising anode for lithium-ion batteries, is easy to form high-valence manganese oxides during the battery operation, causing a continuous capacity increase and hindering practical appli...

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Topics: Battery (electricity) (65%), Lithium-ion battery (65%), Anode (52%)

Journal ArticleDOI: 10.1115/1.4051854
Xinhui Zhao1, Qingqing Ren1Institutions (1)
01 May 2022-
Topics: Lithium (60%), Anode (58%), Oxide (55%) ... read more

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64 results found


Journal ArticleDOI: 10.1038/451652A
Michel Armand1, Jean-Marie Tarascon1Institutions (1)
06 Feb 2008-Nature
Abstract: Researchers must find a sustainable way of providing the power our modern lifestyles demand.

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13,749 Citations


Journal ArticleDOI: 10.1038/35035045
Philippe Poizot1, S. Laruelle1, Sylvie Grugeon1, Loic Dupont1  +1 moreInstitutions (1)
28 Sep 2000-Nature
Abstract: Rechargeable solid-state batteries have long been considered an attractive power source for a wide variety of applications, and in particular, lithium-ion batteries are emerging as the technology of choice for portable electronics. One of the main challenges in the design of these batteries is to ensure that the electrodes maintain their integrity over many discharge-recharge cycles. Although promising electrode systems have recently been proposed, their lifespans are limited by Li-alloying agglomeration or the growth of passivation layers, which prevent the fully reversible insertion of Li ions into the negative electrodes. Here we report that electrodes made of nanoparticles of transition-metal oxides (MO, where M is Co, Ni, Cu or Fe) demonstrate electrochemical capacities of 700 mA h g(-1), with 100% capacity retention for up to 100 cycles and high recharging rates. The mechanism of Li reactivity differs from the classical Li insertion/deinsertion or Li-alloying processes, and involves the formation and decomposition of Li2O, accompanying the reduction and oxidation of metal nanoparticles (in the range 1-5 nanometres) respectively. We expect that the use of transition-metal nanoparticles to enhance surface electrochemical reactivity will lead to further improvements in the performance of lithium-ion batteries.

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6,998 Citations


Journal ArticleDOI: 10.1039/C1EE01598B
Vinodkumar Etacheri1, Rotem Marom1, Ran Elazari1, Gregory Salitra1  +1 moreInstitutions (1)
Abstract: Li-ion battery technology has become very important in recent years as these batteries show great promise as power sources that can lead us to the electric vehicle (EV) revolution. The development of new materials for Li-ion batteries is the focus of research in prominent groups in the field of materials science throughout the world. Li-ion batteries can be considered to be the most impressive success story of modern electrochemistry in the last two decades. They power most of today's portable devices, and seem to overcome the psychological barriers against the use of such high energy density devices on a larger scale for more demanding applications, such as EV. Since this field is advancing rapidly and attracting an increasing number of researchers, it is important to provide current and timely updates of this constantly changing technology. In this review, we describe the key aspects of Li-ion batteries: the basic science behind their operation, the most relevant components, anodes, cathodes, electrolyte solutions, as well as important future directions for R&D of advanced Li-ion batteries for demanding use, such as EV and load-leveling applications.

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Topics: Battery (electricity) (50%)

4,656 Citations


Open accessJournal ArticleDOI: 10.1038/NATREVMATS.2016.98
Abstract: The family of 2D transition metal carbides, carbonitrides and nitrides (collectively referred to as MXenes) has expanded rapidly since the discovery of Ti3C2 in 2011. The materials reported so far always have surface terminations, such as hydroxyl, oxygen or fluorine, which impart hydrophilicity to their surfaces. About 20 different MXenes have been synthesized, and the structures and properties of dozens more have been theoretically predicted. The availability of solid solutions, the control of surface terminations and a recent discovery of multi-transition-metal layered MXenes offer the potential for synthesis of many new structures. The versatile chemistry of MXenes allows the tuning of properties for applications including energy storage, electromagnetic interference shielding, reinforcement for composites, water purification, gas- and biosensors, lubrication, and photo-, electro- and chemical catalysis. Attractive electronic, optical, plasmonic and thermoelectric properties have also been shown. In this Review, we present the synthesis, structure and properties of MXenes, as well as their energy storage and related applications, and an outlook for future research. More than twenty 2D carbides, nitrides and carbonitrides of transition metals (MXenes) have been synthesized and studied, and dozens more predicted to exist. Highly electrically conductive MXenes show promise in electrical energy storage, electromagnetic interference shielding, electrocatalysis, plasmonics and other applications.

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Topics: MXenes (76%)

3,017 Citations


Open accessJournal ArticleDOI: 10.1002/ADFM.201701264
Jun Yan1, Jun Yan2, Chang E. Ren2, Kathleen Maleski2  +5 moreInstitutions (2)
Abstract: A strategy to prepare flexible and conductive MXene/graphene (reduced graphene oxide, rGO) supercapacitor electrodes by using electrostatic self-assembly between positively charged rGO modified with poly(diallyldimethylammonium chloride) and negatively charged titanium carbide MXene nanosheets is presented. After electrostatic assembly, rGO nanosheets are inserted in-between MXene layers. As a result, the self-restacking of MXene nanosheets is effectively prevented, leading to a considerably increased interlayer spacing. Accelerated diffusion of electrolyte ions enables more electroactive sites to become accessible. The freestanding MXene/rGO-5 wt% electrode displays a volumetric capacitance of 1040 F cm−3 at a scan rate of 2 mV s−1 , an impressive rate capability with 61% capacitance retention at 1 V s−1 and long cycle life. Moreover, the fabricated binder-free symmetric supercapacitor shows an ultrahigh volumetric energy density of 32.6 Wh L−1, which is among the highest values reported for carbon and MXene based materials in aqueous electrolytes. This work provides fundamental insight into the effect of interlayer spacing on the electrochemical performance of 2D hybrid materials and sheds light on the design of next-generation flexible, portable and highly integrated supercapacitors with high volumetric and rate performances.

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Topics: Graphene (51%), Supercapacitor (51%)

797 Citations