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Sambandam, Balaji,Soundharrajan, Vaiyapuri,Kim, Sungjin,Alfaruqi, Muhammad H.,Jo, Jeonggeun,Kim, Seokhun,Mathew, Vinod,Sun, Yang-kook,Kim, Jaekook The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.32
<P>1D nanorods of the layered material K2V6O16·2.7H2O (KVO) are implemented for the first time as cathode materials in secondary aqueous rechargeable Zn-ion batteries (ARZIBs) and exhibit excellent electrochemical Zn storage properties. This cathode material delivers a reversible capacity of 296 mA h g<SUP>−1</SUP> over 100 cycles. At current densities of 1000, 3000, and 5000 mA g<SUP>−1</SUP> for 700 cycles, the electrode displays reversible capacities of 223, 177, and 138 mA h g<SUP>−1</SUP>, for approximately 170, 300, and 230 cycles, respectively. In addition to these properties, it withstands over 500 cycles at an applied current density of 6000 mA g<SUP>−1</SUP> with nearly 82% capacity retention. The battery offers a specific energy of 128 Wh kg<SUP>−1</SUP> at a specific power of 5760 W kg<SUP>−1</SUP>, revealing the advantages of the material in an eco-friendly atmosphere.</P>
Sambandam, Balaji,Soundharrajan, Vaiyapuri,Song, Jinju,Kim, Sungjin,Jo, Jeonggeun,Pham, Duong Tung,Kim, Seokhun,Mathew, Vinod,Kim, Jaekook Elsevier 2017 Chemical engineering journal Vol.328 No.-
<P><B>Abstract</B></P> <P>Zn<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB> (ZVO) with sheet-like morphology is synthesized by a simple green precipitation technique via a metal-organic framework (MOF) intermediate for use as an anode in high energy lithium-ion batteries (LIBs). This sheet-like morphology, enriched with highly porous features, is evident from transmission electron microscopy (TEM) and surface area measurements. When tested as a lithium half-cell electrode, the ZVO porous sheets delivered a reversible specific capacity of 1228mAhg<SUP>−1</SUP> at a current density of 0.3Ag<SUP>−1</SUP> for 200 cycles. Interestingly, on applying two different high current densities of 1 and 3Ag<SUP>−1</SUP>, this porous ZVO material registered high capacities of 665 and 510mAhg<SUP>−1</SUP>, initially for 30 and 50 cycles, respectively. On reducing the current density to 0.5 and 1Ag<SUP>−1</SUP> for the two instances, both sustained stable capacities of 906 and 687mAhg<SUP>−1</SUP> in the 160th and 600th cycles, respectively. The fact that these porous sheets maintained a stable capacity as high as 370mAhg<SUP>−1</SUP> at the high applied current density of 5Ag<SUP>−1</SUP> after 2000 discharge/charge cycles reveals the structural stability of the ZVO prepared by a simple green precipitation technique.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Zn<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB> porous sheets morphology are synthesized by facile and green method. </LI> <LI> It shows excellent structure and electrochemical stability for lithium ion batteries. </LI> <LI> It delivers specific capacity of 1128mAhg<SUP>−1</SUP> after 200 cycles at 0.3Ag<SUP>−1</SUP>. </LI> <LI> It shows high capacity of 370mAhg<SUP>−1</SUP> over 2000 cycles at 5Ag<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Sambandam, Balaji,Soundharrajan, Vaiyapuri,Kim, Sungjin,Alfaruqi, Muhammad H.,Jo, Jeonggeun,Kim, Seokhun,Mathew, Vinod,Sun, Yang-kook,Kim, Jaekook The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.9
<P>The use of transition-metal vanadium oxides (TMVOs) for the production of safe and low-cost aqueous rechargeable zinc-ion batteries (ARZIBs) has not been fully explored in detail so far. The electrochemistry involved in multistep Zn<SUP>2+</SUP> insertion/de-insertion induced by vanadium reduction/oxidation in layered α-Zn2V2O7 upon cycling has been interpreted. Layered α-Zn2V2O7 exhibits an excellent specific energy of 166 W h kg<SUP>−1</SUP> and a high capacity retention of 85% after 1000 cycles at an ultra-high current drain of 4000 mA g<SUP>−1</SUP>.</P>
Sambandam, Balaji,Soundharrajan, Vaiyapuri,Song, Jinju,Kim, Sungjin,Jo, Jeonggeun,Pham, Duong Tung,Kim, Seokhun,Mathew, Vinod,Kim, Kwang Ho,Sun, Yang-Kook,Kim, Jaekook Elsevier 2018 Journal of Electroanalytical Chemistry Vol.810 No.-
<P><B>Abstract</B></P> <P>Nickel vanadate (Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8,</SUB> NVO) nanoparticles (NPs) with a typical size of 30nm were prepared through a zeolitic imidazolate framework (ZIF) intermediate precipitation method using water as a solvent. The intermediate and the NVO obtained after annealing the intermediate were systematically characterized using various techniques. When tested as an anode for Li-ion batteries (LIBs), the electrode displayed stable specific capacities of 940 and 305mAhg<SUP>−1</SUP> at 1 and 5Ag<SUP>−1</SUP>, respectively, after 400 and 1000cycles. Additionally, a very high reversible capacity of 1024mAhg<SUP>−1</SUP> was observed after 525cycles, during which high current densities of 2 and 0.5Ag<SUP>−1</SUP> alternated every 100cycles. The long cycling rate capability with repeated sets, confirm the structural stability of the material, which was prepared through a facile and eco-friendly procedure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB> prepared by facile precipitation through a metal-organic framework. </LI> <LI> It shows good electrochemical behavior for lithium ion batteries (LIBs) as an anode. </LI> <LI> Shows capacities of 940 (305) mAhg<SUP>−1</SUP> at 1(5) Ag<SUP>−1</SUP>, respectively, after 400 (1000) cycles. </LI> <LI> Retains a capacity of 1024mAhg<SUP>−1</SUP> at altered 2/0.5Ag<SUP>−1</SUP> after 525cycles. </LI> <LI> Ex situ XPS supports the reaction mechanism behind the electrochemistry. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Soundharrajan, Vaiyapuri,Sambandam, Balaji,Kim, Sungjin,Alfaruqi, Muhammad H.,Putro, Dimas Yunianto,Jo, Jeonggeun,Kim, Seokhun,Mathew, Vinod,Sun, Yang-Kook,Kim, Jaekook American Chemical Society 2018 NANO LETTERS Vol.18 No.4
<P>Owing to their safety and low cost, aqueous rechargeable Zn-ion batteries (ARZIBs) are currently more feasible for grid-scale applications, as compared to their alkali counterparts such as lithium- and sodium-ion batteries (LIBs and SIBs), for both aqueous and nonaqueous systems. However, the materials used in ARZIBs have a poor rate capability and inadequate cycle lifespan, serving as a major handicap for long-term storage applications. Here, we report vanadium-based Na<SUB>2</SUB>V<SUB>6</SUB>O<SUB>16</SUB>·3H<SUB>2</SUB>O nanorods employed as a positive electrode for ARZIBs, which display superior electrochemical Zn storage properties. A reversible Zn<SUP>2+</SUP>-ion (de)intercalation reaction describing the storage mechanism is revealed using the in situ synchrotron X-ray diffraction technique. This cathode material delivers a very high rate capability and high capacity retention of more than 80% over 1000 cycles, at a current rate of 40C (1C = 361 mA g<SUP>-1</SUP>). The battery offers a specific energy of 90 W h kg<SUP>-1</SUP> at a specific power of 15.8 KW kg<SUP>-1</SUP>, enlightening the material advantages for an eco-friendly atmosphere.</P> [FIG OMISSION]</BR>
Soundharrajan, Vaiyapuri,Sambandam, Balaji,Song, Jinju,Kim, Sungjin,Jo, Jeonggeun,Kim, Seokhun,Lee, Seulgi,Mathew, Vinod,Kim, Jaekook American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.13
<P>Metal-organic framework (MOF)-based synthesis of battery electrodes has presntly become a topic of significant research interest. Considering the complications to prepare Co3V2O8 due to the criticality of its stoichiometric composition, we report on a simple MOF-based solvothermal synthesis of CO3V2O8 for use as potential anodes for lithium battery applications. Characterizations by X-ray diffraction, X-ray photoelectron spectroscopy, high resolution electron microscopy, and porous studies revealed that the phase pure Co3V2O8 nanoparticles are interconnected to form a sponge-like morphology with porous properties. Electrochemical measurements exposed the excellent lithium storage (similar to 1000 mAh g(-1) at 200 mA g(-1)) and retention properties (501 mAh g(-1) at 1000 mA g(-1) after 700 cycles) of the prepared Co3V2O8 electrode. A notable rate performance of 430 mAh g-1 at 3200 mA g-1 was also observed, and ex situ investigations confirmed the morphological and structural stability of this material. These results validate that the unique nanostructured morphology arising from the use of the ordered array of MOF networks is favorable for improving the cyclability and rate capability in battery electrodes. The synthetic strategy presented herein may provide solutions to develop phase pure mixed metal oxides for high-performance electrodes for useful energy storage applications.</P>
Soundharrajan, Vaiyapuri,Sambandam, Balaji,Song, Jinju,Kim, Sungjin,Jo, Jeonggeun,Duong, Pham Tung,Kim, Seokhun,Mathew, Vinod,Kim, Jaekook Academic Press 2017 Journal of Colloid and Interface Science Vol. No.
<P><B>Abstract</B></P> <P>In the present study, a metal-organic framework (MOF) derived from a facile water-assisted green precipitation technique is employed to synthesize phase-pure cobalt vanadate (Co<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB>, CVO) anode for lithium-ion battery (LIB) application. The material obtained by this eco-friendly method is systematically characterized using various techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N<SUB>2</SUB> adsorption–desorption measurements. By using as an anode, an initial discharge capacity of 1640mAhg<SUP>−1</SUP> and a reversible capacity of 1194mAhg<SUP>−1</SUP> are obtained at the applied current densities after the 240th cycle (2Ag<SUP>−1</SUP> for 200 cycles followed by 0.2Ag<SUP>−1</SUP> for 40 cycles). Moreover, a reversible capacity as high as 962mAhg<SUP>−1</SUP> is retained at high current densities even after 240 cycles (4Ag<SUP>−1</SUP> for 200 cycles followed by 2Ag<SUP>−1</SUP> for 40 cycles), revealing the long life stability of the electrode. Significantly, CVO anode composed of fine nanoparticles (NPs) registered a substantial rate performance and reversible specific capacities of 275, 390, 543 and 699mAhg<SUP>−1</SUP> at high reversibly altered current densities of 10, 5, 2, and 1Ag<SUP>−1</SUP>, respectively.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Soundharrajan, Vaiyapuri,Sambandam, Balaji,Song, Jinju,Kim, Sungjin,Jo, Jeonggeun,Pham, Duong Tung,Kim, Seokhun,Mathew, Vinod,Kim, Jaekook Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.16
<P><B>Abstract</B></P> <P>The present study reports on the one-pot synthesis of Ni<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB> (NVO) electrodes by a simple metal organic framework-combustion (MOF-C) technique for anode applications in Li-ion batteries (LIBs). The particle morphology of the prepared NVO is observed to vary as irregular rods, porous bitter gourd and hybrid micro/nano particles depending on the concentration of the framework linker used during synthesis. In specific, the orthorhombic phase and the unique bitter gourd-type secondary structure comprised of agglomerated nanoparticles and porous morphologies is confirmed using powder X-ray diffraction, electron microscopies, X-ray photoelectron spectroscopy and N<SUB>2</SUB> adsorption–desorption measurements. When tested for lithium batteries as anode, the bitter gourd-type NVO electrode shows an initial discharge capacity of 1362mAhg<SUP>−1</SUP> and a reversible capacity of 822mAhg<SUP>−1</SUP> are sustained at a rate of 200mAg<SUP>−1</SUP> after 100 cycles. Moreover, at 2000mAg<SUP>−1</SUP>, a reversible capacity of 724mAhg<SUP>−1</SUP> is retained after 500 cycles. Interestingly, the porous bitter gourd-shaped NVO electrode registered significantly high rate performance and reversible specific capacities of 764, 531 and 313mAhg<SUP>−1</SUP> at high rates of 1, 5 and 10Ag<SUP>−1</SUP>, respectively.</P>
Silvampatti Ramasamy Sundararajan,Balaji Sambandam,Ajay Singh,Ramakanth Rajagopalakrishnan,Shanmuganathan Rajasekaran 대한슬관절학회 2018 대한슬관절학회지 Vol.30 No.4
Purpose: Tunnel widening following anterior cruciate ligament (ACL) reconstruction is commonly observed. Graft micromotion is an important contributing factor. Unlike fixedloop devices that require a turning space, adjustableloop devices fit the graft snugly in the tunnel. The purpose of this study is to compare tunnel widening between these devices. Our hypothesis is that the adjustableloop device will create lesser tunnel widening.Materials and Methods: Ninetyeight patients underwent ACL reconstruction from January 2013 to December 2014. An adjustableloop device was used in 54 patients (group 1) and a fixedloop device was used in 44 patients (group 2). Maximum tunnel widening at 1 year was measured by the L’Insalata’s method. Functional outcome was measured at 2year followup.Results: The mean widening was 4.37 mm (standard deviation [SD], 2.01) in group 1 and 4.09 mm (SD, 1.98) in group 2 (p=0.511). The average International Knee Documentation Committee score was 78.40 (SD, 9.99) in group 1 and 77.11 (SD, 12.31) in group 2 (p=0.563). The average TegnerLysholm score was 87.25 (SD, 3.97) in group 1 and 87.29 in group 2 (SD, 4.36) (p=0.987). There was no significant difference in tunnel widening and functional outcome between the groups. Conclusions: The adjustableloop device did not decrease the amount of tunnel widening when compared to the fixedloop device. There was no significant difference in outcome between the two fixation devices.Level of Evidence: Level 3, Retrospective Cohort