Abstract
Li x TiP 4 ternary phases ( x=7 and 9) show very close electrochemical behaviors versus lithium compared to the previously reported Li 9VAs 4 and Li 7VP 4. Up to seven lithium ions reversibly react with Li 9TiP 4, leading to specific and volumetric capacities of 970 mAh/g and 1650 mAh/cm 3, 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 Li 9TiP 4 and Li 9VAs 4 undergo a reversible crystalline to amorphous structural phase transition upon cycling.
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