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High-Performance Li3V2(PO4)3/Li4Ti5O12/C Composite Cathode for Li-ion Batteries

This research focuses on a novel cathode material for lithium-ion batteries, the Li3V2(PO4)3/Li4Ti5O12/C composite, synthesized via a sol-gel method. The material exhibits high ionic diffusion coefficient, good cyclic performance, and thermal stability. Experimental details and results, including EDS, TEM, XRD, and cyclic performance data, are presented. The composite’s improved rate capability and cycling performance are attributed to the presence of carbon and Li4Ti5O12 with a high lithium ion diffusion coefficient.

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High-Performance Li3V2(PO4)3/Li4Ti5O12/C Composite Cathode for Li-ion Batteries

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  1. Research on Li3V2(PO4)3/Li4Ti5O12/C composite cathode material for lithium ion batteries 指导教师：唐致远教授 学生：王利娟

  2. High ionic diffusion coefficient Good cyclic performance Good thermal stability 1. Introduction about LVP High discharge voltage and energy density Advantages

  3. Low electronic conductivity Disadvantages Unsatisfactory rate capability

  4. A zero-strain material High lithium ion diffusion coefficient Stable high-temperature performance Good rate capability 2. Introduction about LTO Advantages

  5. 3. Experimental Mixing LiOH·H2O, NH4H2PO4 andbeta-cyclodextrin Mixing NH4VO3 and oxalic acid Solution B Adding to Solution A Solution C Suspension of Li4Ti5O12 Heating at 80℃ Adding into Sol Heating at 80℃ Gel Preheating and sintering Li3V2(PO4)3/ Li4Ti5O12/C

  6. 4. Results and discussion： EDS TEM XRD SAED TEM SEM

  7. 此方法制备的LVP/LTO/C可以在25C-50C充放电电流下循环此方法制备的LVP/LTO/C可以在25C-50C充放电电流下循环 Fig .2(a) Charge-discharge curves of LVP/LTO/C at different currents; (b) Cyclic performance of LVP/LTO/C at different currents.

  8. LTO的包覆提高了LVP/C的离子扩散速率 LVP/LTO/C Dc:7.7×10-10cm2 s-1 Dc’: 6.4×10-10 cm2 s-1 LVP/C Dc:4.9×10-10cm2 s-1 Dc’: 4.0×10-10 cm2 s-1 Fig. 3(a) Cyclic voltammograms of Li3V2(PO4)3/Li4Ti5O12/C composite and (b) Li3V2(PO4)3/C material at different scanning rates in the range of 3.0-4.3 V. Relationship of peak current (Ip) and the square root of scanning rate (v1/2) for (c) Li3V2(PO4)3/Li4Ti5O12/C composite and (d) Li3V2(PO4)3/C material

  9. 5. Conclusions： • The Li3V2(PO4)3/Li4Ti5O12/C (LVP/LTO/C) material, • with unexceptionable rate capability and cyclic • performance has been firstly synthesized via a sol-gel • method. 2) The appealing results are related to the existence of the carbon and the LTO with high lithium ion diffusion coefficient.

  10. Thank you!

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