Li diffusion properties of mixed conducting TiO2-B nanowires

被引：30

作者：

Wilkening, M. ^{[1
,2
]}

Heine, J. ^{[1
,2
]}

Lyness, C. ^{[3
]}

Armstrong, A. R. ^{[3
]}

Bruce, P. G. ^{[3
]}

机构：

[1] Leibniz Univ Hannover, Inst Phys Chem & Electrochem, D-30167 Hannover, Germany

[2] Leibniz Univ Hannover, Ctr Solid State Chem & New Mat, D-30167 Hannover, Germany

[3] Univ St Andrews, Sch Chem, EaStChem, St Andrews KY16 9ST, Fife, Scotland

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 06期

关键词：

anodes; boron; diffusion; lithium; mixed conductivity; nanowires; nuclear magnetic resonance; secondary cells; spin echo (NMR); spin-lattice relaxation; titanium compounds; ECHO NMR-SPECTROSCOPY; RECHARGEABLE LITHIUM BATTERIES; NUCLEAR-MAGNETIC-RESONANCE; SOLID-STATE NMR; SPIN-ALIGNMENT; ION CONDUCTORS; MOTION; DYNAMICS; GLASSES; STORAGE;

D O I：

10.1103/PhysRevB.80.064302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

LixTiO2-B nanowires (0 < x < 0.9) are considered to act as promising anode materials in secondary Li-ion batteries. Li self-diffusion parameters in mixed conducting nanowires of the composition Li0.3TiO2 are directly determined by mixing time (t(m))-dependent two-time Li-7 spin-alignment echo (SAE) nuclear-magnetic-resonance (NMR) correlation spectroscopy between 330 and 500 K. SAE NMR reveals extremely slow Li self-diffusion processes in LixTiO2-B. Li jump rates tau(-1) range from 5 to 2.5x10(3) s(-1). The corresponding hopping correlation functions F-2 can be well parametrized with stretched exponentials, F-2 proportional to exp[-(t/t(m))(gamma)], with an exponent gamma=0.35(2) being independent of temperature. The influence of spin-diffusion effects on the echo amplitude is elaborated by evolution time-dependent Li-7 SAE-NMR experiments. The results are compared with those obtained by conventional Li-7 NMR spin-lattice relaxation measurements.

引用

页数：8

共 36 条

[1]

[Anonymous], NMR BASIC PRINCIPLES

[2] Nanostructured materials for advanced energy conversion and storage devices [J].

Aricò, AS ;

Bruce, P ;

Scrosati, B ;

Tarascon, JM ;

Van Schalkwijk, W .

NATURE MATERIALS, 2005, 4 (05) :366-377

[3] Building better batteries [J].

Armand, M. ;

Tarascon, J. -M. .

NATURE, 2008, 451 (7179) :652-657

[4] TiO2-B nanowires [J].

Armstrong, AR ;

Armstrong, G ;

Canales, J ;

Bruce, PG .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2004, 43 (17) :2286-2288

[5] Lithium-ion intercalation into TiO2-B nanowires [J].

Armstrong, AR ;

Armstrong, G ;

Canales, J ;

García, R ;

Bruce, PG .

ADVANCED MATERIALS, 2005, 17 (07) :862-+

[6]

ARMSTRONG AR, 2005, CHEM COMMUN, P862

[7] RELAXATION EFFECTS IN NUCLEAR MAGNETIC RESONANCE ABSORPTION [J].

BLOEMBERGEN, N ;

PURCELL, EM ;

POUND, RV .

PHYSICAL REVIEW, 1948, 73 (07) :679-712

[8] Solid-state LiNMR with applications to the translational dynamics in ion conductors [J].

Boehmer, R. ;

Jeffrey, K. R. ;

Vogel, M. .

PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY, 2007, 50 (2-3) :87-174

[9] Spin relaxation and ultra-slow Li motion in an aluminosilicate glass ceramic [J].

Boehmer, R. ;

Qi, F. .

SOLID STATE NUCLEAR MAGNETIC RESONANCE, 2007, 31 (01) :28-34

[10] Mistimed stimulated echoes and distorted spin-alignment spectra of powdered solids [J].

Boehmer, Roland ;

Faske, Sandra ;

Geil, Burkhard .

SOLID STATE NUCLEAR MAGNETIC RESONANCE, 2008, 34 (1-2) :32-36

← 1 2 3 4 →