1. Ho Kyun Jung, U Hyeok Choi * Department of Polymer Engineering, Pukyong National University Corresponding author : uhyeok@pknu.ac.kr

2. Synthesis and Lithium Ion Conduction of Silica Aerogel Single-Ion Conductors Containing Weak-binding Lithium Bis(trifluoromethanesulfonyl)imide

3. __ INDEX 1.Introduction 2. Experiment 3. Result & Discussion 4. Conclusion

4. Introduction

8. Experiment TMOS VTMS BTMSPA Precursor :  Tetramethoxysilane (TMOS)  Vinyltrimethoxysilane (VTMS)  Bis[3-(trimethoxysilyl)propyl]amine (BTMSPA) Silica aerogel 3D network structure Silica nanoparticles having vinyl groups GelationAging

9. Experiment AIBN,70 ℃ LiMTFSI Organic inorganic composite single-ion conducting nanoparticles Polym. Chem.,2016, 7, 6901–6910

10. Result & Discussion Field Emission-Scanning Electron Microscopy (FE-SEM) measurement, Brunauer-Emmett-Teller (BET) surface area measurement *BET surface area ~ 541g/m 2 (a) Bare aerogel - before polymerizaion(b) Aerogel with polymer - after polymerizaion

11. Result & Discussion Fourier Transform Infrared (FTIR) spectroscopy – ATR mode measurement ATR-FTIR spectra from 500 to 4000cm -1 at room temperature. Data were shifted vertically for clarity

12. Result & Discussion Thermogravimetric Analyzer (TGA) measurement, heating rate is 10K/min. ACS, Appl, Mater, Interfaces 2016, 8, 10350−10359. Td ~300 ℃, ~450 ℃ Residual weights mean the part of silica aerogel, ~60wt%.

13. Result & Discussion AC impedance spectroscopy measurement with 10mV amplitude, 10 -1 ~ 10 -7 Hz frequency range σ = 1.8x10 -4 at 22 ℃ LiMTFSI weight Propylene carbonate (PC) weight 0.5g10g 1g10g 2g10g 5g10g To get higher conductivity

14. Conclusion  The reason why used silica aerogel 3D network structure as matrix.  The reason why the electrical conductivity value could be high. High surface area means that many ionic polymers can be attached. That is, a high concentration of ions can be introduced in system. Silica aerogel is more stiffness than normal polymeric matrix which using SPEs and thus has the effect of preventing Li dendrite growth. Propylene carbonate(PC) make ions easier to move by decreasing dissociation energy of ion pairs. The TFSI - anion has good electrochemical properties. Its significant charge delocalization leading to a relatively weak Li + TFSI - binding and fast conformational dynamics that is expected to promote Li + transport

15. *Reference [1] B. N. Nguyen, M. A. B. Meador, M. E. Tousley, B. Shonkwiler, L. McCorkle, D. A. Scheiman, and A. Palczer, ACS Appl. Mater. Interfaces 1, 621 (2009). [2] T. N. T. Phan, A. Ferrand, H. T. Ho, L. Liénafa, M. Rollet, S. Maria, R. Bouchet, and D. Gigmes, Polym. Chem. 7, 6901 (2016).

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