title: New Insights into the Structure Changes and Interface Properties of Li3VO4 Anode for Lithium-Ion Batteries during the Initial Cycle by in-Situ Techniques.
abstract: Li3VO4 has been regarded as a new-type anode of lithium-ion batteries in recent years, which has a high theoretical specific capacity of 394 mAh g(-1), a proper potential for Li(+) insertion/deinsertion (∼1 V), and a good rate capacity. However, its low initial Coulombic efficiency, poor conductivity, and poor cycle performance restricts its development. In order to figure out the cause of the low initial Coulombic efficiency of Li3VO4 material, the nanosized Li3VO4 material was synthesized by citric acid-assisted sol-gel method. The lithium storage behaviors of the prepared Li3VO4 material were studied by in-situ XRD and in-situ EIS techniques. In-situ XRD results indicated that there was irreversible phase transformation of Li3VO4 during the initial charging/discharging process. In-situ EIS experiment was performed during the potentiostatic intermittent titration technique (PITT) process to discuss the formation of the solid electrolyte interface (SEI) on the Li3VO4 and the kinetics of lithium-ion diffusion. It is worth pointing out that this is the first time to prove the existence of SEI on Li3VO4 during the initial charging/discharging process by in-situ EIS experiment. It turned out that the irreversible phase transformation and the formation of SEI on Li3VO4 were the two important reasons causing the low initial Coulombic efficiency of Li3VO4 material.
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Li Li
authors.initials: LL
authors.lastname: Zhou
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Shou-Yu
authors.initials: SY
authors.lastname: Shen
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Xin-Xing
authors.initials: XX
authors.lastname: Peng
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Li Na
authors.initials: LN
authors.lastname: Wu
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Chong-Heng
authors.initials: CH
authors.lastname: Shen
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Tu
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Huang
authors.affiliation: College of Energy, Xiamen University , Xiamen 361005, China.
authors.forename: Jun-Tao
authors.initials: JT
authors.lastname: Li
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, State Key Laboratory of Physical Chemistry of Solid Surfaces , Xiamen 361005, China.
authors.forename: Shi-Gang
authors.initials: SG
authors.lastname: Sun
keywords: PITT; in-situ EIS; in-situ XRD; low initial Coulombic efficiency; nanosized Li3VO4