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Titanium‐Based Anode Materials for Safe Lithium‐Ion Batteries
Chen, Zonghai,Belharouak, Ilias,Sun, Y.‐,K.,Amine, Khalil WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.8
<P><B>Abstract</B></P><P>Lithium‐ion batteries have been long considered a promising energy storage technology for electrification of the transportation system. However, the poor safety characteristics of lithium‐ion batteries is one of several technological barriers that hinder their deployment for automobile applications. Within the field of battery research and development, titanium‐based anode materials have recently attracted widespread attention due to their significantly better thermal stability than the conventional graphite anode. In this chapter, the fundamental properties and promising electrochemical performance of titanium‐based anode materials will be discussed for applications in hybrid electric vehicles.</P>
Essehli, R.,Belharouak, I.,Ben Yahia, H.,Maher, K.,Abouimrane, A.,Orayech, B.,Calder, S.,Zhou, X. L.,Zhou, Z.,Sun, Y-K. The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.17
<P>The electroactive orthophosphate Na<SUB>2</SUB>Co<SUB>2</SUB>Fe(PO<SUB>4</SUB>)<SUB>3</SUB> was synthesized using a solid state reaction. Its crystal structure was solved using the combination of powder X-ray- and neutron-diffraction data. This material crystallizes according to the alluaudite structure (S.G. <I>C</I>2/<I>c</I>). The structure consists of edge sharing [MO<SUB>6</SUB>] octahedra (M = Fe, Co) resulting in chains parallel to [−101]. These chains are linked together <I>via</I> the [PO<SUB>4</SUB>] tetrahedra to form two distinct tunnels in which sodium cations are located. The electrochemical properties of Na<SUB>2</SUB>Co<SUB>2</SUB>Fe(PO<SUB>4</SUB>)<SUB>3</SUB> were evaluated by galvanostatic charge–discharge cycling. During the first discharge to 0.03 V, Na<SUB>2</SUB>Co<SUB>2</SUB>Fe(PO<SUB>4</SUB>)<SUB>3</SUB> delivers a specific capacity of 604 mA h g<SUP>−1</SUP>. This capacity is equivalent to the reaction of more than seven sodium ions per formula unit. Hence, this is a strong indication of a conversion-type reaction with the formation of metallic Fe and Co. The subsequent charge and discharge involved the reaction of fewer Na ions as expected for a conversion reaction. When discharged to 0.9 V, the material intercalated only one Na<SUP>+</SUP>-ion leading to the formation of a new phase Na<SUB>3</SUB>Co<SUB>2</SUB>Fe(PO<SUB>4</SUB>)<SUB>3</SUB>. This phase could then be cycled reversibly with an average voltage of 3.6 V <I>vs.</I> Na<SUP>+</SUP>/Na and a capacity of 110 mA h g<SUP>−1</SUP>. This result is in good agreement with the theoretical capacity expected from the extraction/insertion of two sodium atoms in Na<SUB>3</SUB>Co<SUB>2</SUB>Fe(PO<SUB>4</SUB>)<SUB>3</SUB>.</P> <P>Graphic Abstract</P><P>Na<SUB>2</SUB>Co<SUB>2</SUB>Fe(PO<SUB>4</SUB>)<SUB>3</SUB> crystallizes with the alluaudite-type structure (S.G. <I>C</I>2/<I>c</I>) and plays a dual anode/cathode behavior in sodium ion batteries. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5dt00971e'> </P>
Nanostructured Anode Material for High-Power Battery System in Electric Vehicles
Amine, Khalil,Belharouak, Ilias,Chen, Zonghai,Tran, Taison,Yumoto, Hiroyuki,Ota, Naoki,Myung, Seung-Taek,Sun, Yang-Kook WILEY-VCH Verlag 2010 Advanced Materials Vol.22 No.28
<B>Graphic Abstract</B> <P>A new MSNP-LTO anode is developed to enable a high-power battery system that provides three times more power than any existing battery system. It shows excellent cycle life and low-temperature performance, and exhibits unmatched safety characteristics. <img src='wiley_img_2010/09359648-2010-22-28-ADMA201000441-content.gif' alt='wiley_img_2010/09359648-2010-22-28-ADMA201000441-content'> </P>
Deng, Haixia,Belharouak, Ilias,Sun, Yang-Kook,Amine, Khalil Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.26
<P>Manganese-rich and cobalt-free compounds of Li<SUB><I>x</I></SUB>Ni<SUB>0.25</SUB>Mn<SUB>0.75</SUB>O<SUB><I>y</I></SUB> (0.5 ≤ <I>x</I> ≤ 2, 2 ≤ <I>y</I> ≤ 2.75) were investigated as the positive electrode materials for high energy lithium-ion batteries. Compounds with <I>x</I> = 0.5, 1, 1.25, 1.5, and 2 were prepared by a solid-state reaction from the same carbonate precursor, Ni<SUB>0.25</SUB>Mn<SUB>0.75</SUB>CO<SUB>3</SUB>, with an appropriate amount of Li<SUB>2</SUB>CO<SUB>3</SUB>. The structural and physical characteristics of these phases were determined by X-ray diffraction and scanning electron microscopy. With an increase of the lithium content, the Li<SUB><I>x</I></SUB>Ni<SUB>0.25</SUB>Mn<SUB>0.75</SUB>O<SUB><I>y</I></SUB> evolved from a spinel (Fd3&cmb.macr;m) structure (<I>x</I> = 0.5) to a mixed spinel-layered (Fd3&cmb.macr;m and C2/c) structure (<I>x</I> = 1 and 1.25), to a more layered (R3&cmb.macr;m and C2/c) structure (<I>x</I> = 1.5 and 2). A similar structural trend was found for samples prepared from NiMn<SUB>2</SUB>O<SUB>4</SUB>–Mn<SUB>2</SUB>O<SUB>3</SUB> mixed oxide, itself prepared by thermal decomposition of Ni<SUB>0.25</SUB>Mn<SUB>0.75</SUB>CO<SUB>3</SUB> carbonate precursor, to which appropriate amounts of Li<SUB>2</SUB>CO<SUB>3</SUB> were added. An increase of the lithium content also affected the size of the primary particles and the roughness of the secondary particles, without any substantial change of their spherical morphology and packing densities. Further results showed that the electrochemical performance and safety characteristics of the Li<SUB><I>x</I></SUB>Ni<SUB>0.25</SUB>Mn<SUB>0.75</SUB>O<SUB><I>y</I></SUB> materials were primarily governed by their structures.</P> <P>Graphic Abstract</P><P>Despite the integration of different phases within each particle, these nickel and manganese oxide precursors served to prepare lithiated materials for high-power and high-energy density lithium-ion batteries. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b904098f'> </P>
High-power lithium polysulfide-carbon battery
Shin, H.d.,Agostini, M.,Belharouak, I.,Hassoun, J.,Sun, Y.K. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.96 No.-
<P>We report a lithium battery using activated carbon on gas diffusion layer (GDL) electrode as host for lithium polysulfide conversion reaction. The cell operates within 2.8 and 2.1 V and delivers a capacity ranging from 400 mAh g(-1) at 1C to 150 mAh g(-1) at 40C over 100 cycles. These characteristics allow the achievement of high energy and power density, i.e. practically estimated to reach the maximum values of the order of 300 Wh kg(-1) and 12 kW kg(-1), respectively. These values, exceeding those delivered by the conventional lithium ion batteries, make our battery of sure interest for practical applications. (C) 2015 Elsevier Ltd. All rights reserved.</P>
Superior Li/Na-storage capability of a carbon-free hierarchical CoS<sub>x</sub> hollow nanostructure
Xiao, Ying,Hwang, Jang-Yeon,Belharouak, Ilias,Sun, Yang-Kook Elsevier 2017 Nano energy Vol.32 No.-
<P><B>Abstract</B></P> <P>Cobalt sulfides have attracted tremendous attention as promising anodes for lithium-and sodium-ion batteries. However, the delivery of a high capacity with good cycle life conferred by carbon-free cobalt sulfides is a still challenge. In this work, carbon-free CoS<SUB>x</SUB> hollow nanospheres have been prepared and investigated as an advanced anode material for both lithium- and sodium-ion batteries. The resultant material features a unique nano-architecture with hollow core and porous shell. Based on time-dependent experiments, an Ostwald ripening process is proposed to describe the formation of the hierarchical hollow structure. By virtue of its appealing structure and conversion electrochemical reaction mechanism, remarkable electrochemical performances (e.g., high Li/Na-storage capacity, excellent cycling stability, and good rate capability) are achieved when this material is utilized as the anode materials in rechargeable batteries. For instance, a high Li/Na-storage capacity (1012.1mAhg<SUP>−1</SUP> and 572.0mAhg<SUP>−1</SUP>) can be delivered after 100 cycles at 500mAg<SUP>−1</SUP>, corresponding to satisfied capacity retentions, suggesting the great promise of this material for application in rechargeable batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A uniform carbon-free CoS<SUB>x</SUB> hollow structure has been prepared through an Ostwald ripening process. </LI> <LI> Remarkable cycling stability rate capability have been achieved using the designed CoS<SUB>x</SUB> anodes. </LI> <LI> The designed anode displays competitive electrochemical performance compared to carbon-contained counterparts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>