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- 저자 : Benmokhtar, F. (검색결과 2 건)
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Iron titanium phosphates as high-specific-capacity electrode materials for lithium ion batteries
Essehli, R.,El Bali, B.,Faik, A.,Naji, M.,Benmokhtar, S.,Zhong, Y.R.,Su, L.W.,Zhou, Z.,Kim, J.,Kang, K.,Dusek, M. Elsevier Sequoia 2014 Journal of Alloys and Compounds Vol.585 No.-
Two iron titanium phosphates, Fe<SUB>0.5</SUB>TiOPO<SUB>4</SUB> and Fe<SUB>0.5</SUB>Ti<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>, were prepared, and their crystal structures and electrochemical performances were compared. The electrochemical measurements of Fe<SUB>0.5</SUB>TiOPO<SUB>4</SUB> as an anode of a lithium ion cell showed that upon the first discharge down to 0.5V, the cell delivered a capacity of 560mAh/g, corresponding to the insertion of 5 Li's per formula unit Fe<SUB>0.5</SUB>TiOPO<SUB>4</SUB>. Ex-situ XRD reveals a gradual evolution of the structure during cycling of the material, with lower crystallinity after the first discharge cycle. By correlating the electrochemical performances with the structural studies, new insights are achieved into the electrochemical behaviour of the Fe<SUB>0.5</SUB>TiOPO<SUB>4</SUB> anode material, suggesting a combination of intercalation and conversion reactions. The Nasicon-type Fe<SUB>0.5</SUB>Ti<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> consists of a three-dimensional network made of corners and edges sharing [TiO<SUB>6</SUB>] and [FeO<SUB>6</SUB>] octahedra and [PO<SUB>4</SUB>] tetrahedra leading to the formation of trimmers [FeTi<SUB>2</SUB>O<SUB>12</SUB>]. The first discharge of lithium ion cells based on Fe<SUB>0.5</SUB>Ti<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> materials showed electrochemical activity of Ti<SUP>4+</SUP>/Ti<SUP>3+</SUP> and Fe<SUP>2+</SUP>/Fe<SUP>0</SUP> couples in the 2.5-1V region. Below this voltage, the discharge profiles are typical of phosphate systems where Li<SUB>3</SUB>PO<SUB>4</SUB> is a product of the electrochemical reaction with lithium; moreover, the electrolyte solvent is reduced. An initial capacities as high as 1100mAhg<SUP>-1</SUP> can be obtained at deep discharge. However, there is an irreversible capacity loss in Fe<SUB>0.5</SUB>Ti<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> due to the occurrence of insulating products as Li<SUB>3</SUB>PO<SUB>4</SUB> and a solid electrolyte interface.
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Katich, J.,Qian, X.,Zhao, Y. X.,Allada, K.,Aniol, K.,Annand, J. R. M.,Averett, T.,Benmokhtar, F.,Bertozzi, W.,Bradshaw, P. C.,Bosted, P.,Camsonne, A.,Canan, M.,Cates, G. D.,Chen, C.,Chen, J.-P.,Chen, American Physical Society 2014 Physical Review Letters Vol.113 No.2
<P>We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction 3)He()(e,e')X on a polarized (3)He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation but can be nonzero if two-photon-exchange contributions are included. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7<W<2.9??GeV, 1.0<Q(2)<4.0??GeV(2) and 0.16<x<0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-(3)He cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.090.38)10(-2) for invariant mass W>2??GeV, which is nonzero at the 2.89σ level. Our measured asymmetry agrees both in sign and magnitude with a two-photon-exchange model prediction that uses input from the Sivers transverse momentum distribution obtained from semi-inclusive deep-inelastic scattering.</P>
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