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Structural and energy storage studies of Copper Oxide Mei Shiyuan 1, M.V. Reddy 2, 3*, S. Adams 3, B.V.R.Chowdan 2 1 SRP student, Hwa Chong Institution,

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Presentation on theme: "Structural and energy storage studies of Copper Oxide Mei Shiyuan 1, M.V. Reddy 2, 3*, S. Adams 3, B.V.R.Chowdan 2 1 SRP student, Hwa Chong Institution,"— Presentation transcript:

1 Structural and energy storage studies of Copper Oxide Mei Shiyuan 1, M.V. Reddy 2, 3*, S. Adams 3, B.V.R.Chowdan 2 1 SRP student, Hwa Chong Institution, 661, Bukit Timah Road, Singapore Department of Physics, Solid State Ionics/Advanced Batteries Lab, National University of Singapore, Singapore Department of materials Science & Engineering; National University of Singapore, Singapore *Corresponding Author:

2 Introduction  Power sources for portable devices  Advantages: high energy density Lightweight a long life span  Commercially used anode - graphite  Low capacity of 372 mAh per gram, compared with other materials (CuO - 650mAh per gram) Lithium Ion Battery 2

3 Introduction High theoretical capacity More eco-friendly In this project we prepared the samples at various temperatures and studied the effect of reheating them to 750 o C Copper Oxide 3 CuO has a Monoclinic structure

4 Preparation Molten salt method 4 Heat mixture Cu(SO)4·5H2O M LiNO3:0.12M LiCl inside an Alumina Crucible at 280o C for 3 hours Cool down the sample to room temperature Reheat the sample to 750 o C for another 3 hours

5 Sample NumberMaterials used to prepare the samples Temperature heated for the first 3 hours ( o C) Temperature reheated to( o C) Sample 1CuSO 4 ·5H 2 O and 0.88M LiNO 3 :0.12M LiCl Sample 2Cu (NO 3 ) 2 ·3H 2 O and 0.88M LiNO 3 :0.12M LiCl Sample 3CuSO 4 ·5H 2 O and 0.88M LiNO 3 :0.12M LiCl Sample 4CuSO 4 ·5H 2 O and 0.88M LiNO 3 :0.12M LiCl Sample 5CuSO 4 ·5H 2 O and 0.88M LiNO 3 :0.12M LiCl Sample 6Cu (NO 3 ) 2 ·3H 2 O and 0.88M LiNO 3 :0.12M LiCl 750 Preparation conditions 5

6 Fabrication of cells  Super P Carbon – improved its conductivity  Polyvinylidene fluoride (PVDF) - binder  N-methyl pyrrolidone (NMP) – viscous slurry 6

7 Fabrication of cells Top cap Lithium Separator Anode (CuO) Electrolyte Bottom cap 7

8 Results and discussions 8

9 X-Ray Diffraction - To study the crystal structure

10 X-ray diffraction test 10 Compound name Lattice ParametersParticle size (nm)Crystal density (g/cm 3 ) CuO-280 O Ca(Å)=4.6858(5) b(Å)=3.4232(1) c(Å)=5.1291(3) beta(°)= (3) CuO-510 o C- Cu(NO 3 ) 2 a(Å)= (0) b(Å)= (7) c(Å)= (1) beta(°)= CuO-650 o Ca(Å)= (6) b(Å)= (0) c(Å)= (2) beta(°)= CuO-510 o C- CuSO 4 a(Å)= (7) b(Å)= (5) c(Å)= (7) beta(°)= Reference: S. Grugeon, S. Laruelle, R. Herrera-Urbina, L. Dupont, P. Poizot, J-M. Tarascon, Journal of the Electrochemical Society, 148 (4) A285-A292 (2001)

11 Scanning electron microscopy (SEM) Sample o CSample o C Sample o CSample o C Cauliflower -like shape 1

12 Scanning electron microscopy (SEM) CuO heated directly to 750 o C : bar scale: 1 µm Spongy shape Needle shape Change in morphology Drop in capacity 12 CuO reheated to 750 o C prepared from: CuO- 750 o C MSM; bar scale: 1 µm Sample o C

13 Cyclic Voltammetry Sample 4: CuO-510 o C -CuSO 4 MSM  Cathodic peaks Reduction: Cu 2+ to Cu metal  Anodic peaks Oxidation: Cu metal to Cu 2+  2 nd and 5 th Cycles overlap a lot  The peak density decreased for the 5 th Cycle 0.005V 3.0V 13

14 14 1. Reddy, M. V.; Yu, C.; Fan, J. H.; Loh, K. P.; Chowdari, B. V. R., Li-Cycling Properties of Molten Salt Method Prepared Nano/Submicrometer and Micrometer-Sized CuO for Lithium Batteries. ACS Appl. Mater. Interfaces 2013, 5 (10), Cu(SO) 4 ·5H 2 O and 0.68M LiNO 3 :0.32M LiCl with a molar ratio of 1:10 Galvanostatic Cycling - To test the capacity of the cell Sample 4 – reversible capacity increased.The result is better than the cell which was heated directly to 750 o C 1 Capacities were not as high as cells heated directly to 750 o C 1 Due to their difference in morphologies

15 Galvanostatic Cycling Fig: Voltage ( V) vs Capacity of CuO reheated to 750 o C prepared from (a) CuO-280 o C MSM (b) CuO-510 o C-Cu(NO 3 ) 2 MSM (c) CuO-750 o C MSM 15

16 Conclusion Synthesized CuO at various temperature and reheated them to 750 o C X-Ray Diffraction (XRD) Scanning Electron Microscopy (SEM) Cyclic Voltammetry (CV) Galvanostatic Cycling studies (GC) 510 o C using CuSO 4 High and stable reversible capacity 16

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19 reserve SLIDES 28

20 Cyclic Voltammetry 1919

21 Fig: Cyclic voltammograms of CuO reheated to 750 o C prepared from (a) CuO-280 o C MSM (b) CuO-510 o C- Cu(NO 3 ) 2 MSM (c) CuO-650 o C MSM (d) CuO-510 o C -CuSO 4 MSM (e) CuO-410 o C MSM (f) CuO-750 o C MSM 20

22 Cyclic Voltammetry Fig: Cyclic voltammograms of CuO reheated to 750 o C prepared from (a) CuO-280 o C MSM (b) CuO-510 o C- Cu(NO 3 ) 2 MSM (c) CuO-650 o C MSM (d) CuO-510 o C -CuSO 4 MSM (e) CuO-410 o C MSM (f) CuO-750 o C MSM 20


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