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The LixMPn4 phases (M/Pn = Ti/P, V/As): new negative electrode materials for lithium ion rechargeable batteries |
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| Authors: | F Gillot F Favier ML Doublet |
| Affiliation: | a CNRS, Laboratoire des Agrégats Moléculaires et des Matériaux Inorganiques, Department of Chemistry, Universite Montpellier 2, 34095 Montpellier, France b CNRS, Laboratoire de Structure et Dynamique des Systèmes Moléculaires et Solides, Université Montpellier II-Place Eugène Bataillon, F-34 095 Montpellier Cedex 5, France c CNRS, Laboratoire de Réactivité et Chimie des Solides, Université de Picardie Jules Vernes, 33 Rue St. Leu, F-80 039 Amiens Cedex 1, France |
| Abstract: | LixTiP4 ternary phases (x=7 and 9) show very close electrochemical behaviors versus lithium compared to the previously reported Li9VAs4 and Li7VP4. Up to seven lithium ions reversibly react with Li9TiP4, leading to specific and volumetric capacities of 970 mAh/g and 1650 mAh/cm3, respectively, at average potentials close to 1 V. Galvanostatic and potentiodynamic experiments reveal that lithium extraction/insertion follow different mechanisms: a two-phase process is evidenced on charge whereas a more complex process is achieved on discharge. Besides, in situ X-ray diffraction (XRD) patterns show that both Li9TiP4 and Li9VAs4 undergo a reversible crystalline to amorphous structural phase transition upon cycling. |
| Keywords: | Specific capacity Lithium ion battery Mechanism |
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