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Research on Li 3 V 2 (PO 4 ) 3 /Li 4 Ti 5 O 12 /C composite cathode material for lithium ion batteries. 指导教师:唐致远教授 学生:王利娟. High ionic diffusion coefficient. Good cyclic performance. Good thermal stability. 1. Introduction about LVP. High discharge voltage and energy density. Advantages. - PowerPoint PPT Presentation
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Research on LiResearch on Li33VV22(PO(PO44))33/Li/Li44TiTi55OO1212/C /C
composite cathode material for lithium ion batteriescomposite cathode material for lithium ion batteries
指导教师:唐致远教授学生:王利娟
High discharge voltage and energy density
Good cyclic performance
Good thermal stability
High ionic diffusion coefficient
1. Introduction about 1. Introduction about LVP
Advantages
Unsatisfactory rate capability
Disadvantages
High lithium ion diffusion coefficient
Stable high-temperature performance
Good rate capability
A zero-strain material
2. Introduction about 2. Introduction about LTO
Advantages
3. Experimental3. Experimental
Mixing NH4VO3 and oxalic acid Solution A
Mixing LiOH·H2O, NH4H2PO4 and beta-cyclodextrin
Solution BAdding to
Solution C
Heating at 80℃
Sol
Suspension of Li4Ti5O12
Adding into
Gel
Preheating and sintering
Li3V2(PO4)3/ Li4Ti5O12/C
Heating at 80℃
4. Results and discussion4. Results and discussion ::XRD
SEM
TEM
TEM
EDS
SAED
Fig .2(a) Charge-discharge curves of LVP/LTO/C at different currents; (b) Cyclic performance of LVP/LTO/C at different currents.
此方法制备的LVP/LTO/C可以在 25C-
50C充放电电流下循环
LVP/CDc:4.9×10-10cm2 s-1
Dc’: 4.0×10-10 cm2 s-1
LVP/LTO/CDc:7.7×10-10cm2 s-1
Dc’: 6.4×10-10 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
LTO的包覆提高了
LVP/C的离子扩散速率
5. Conclusions5. Conclusions ::
1) 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.
Thank you!
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