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Synthesis of Poly(3,4-ethylenedioxythiophene)/Poly(acrylic acid) (PEDOT/PAA) as a Binder for Lithium-ion Batteries (LIBs)

초록/요약

This study reports the synthesis of poly(3,4-ethylenedioxythiophene) (PEDOT) using poly(acrylic acid) (PAA) as the template and ammonium persulfate (APS) as an oxidant and utilization of the result as a binder for lithium-ion batteries (LIBs). Possessing high conductivity as well as intrinsic flexibility, PEDOT can have an advantage to maintain the conductive path between active materials, conductive additives, and current collector. PEDOT/PAA-bound Si electrode can retain the capacity up to 22.14% whereas PEDOT/PSS-bound Si electrode, PAA-bound Si electrode and PAA+CMC-bound Si electrode can retains only 8.33%, 1.7% and 10.6% after 100 cycles respectively.The electrochemical performance of PEDOT/PAA as a binder was compared with poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT/PSS) (Clevios PH®), PAA and PAA+CMC. The cyclability and adhesion tests show that PEDOT/PAA is a better binder compared with PEDOT/PSS, PAA and PAA+CMC in silicon electrode system.

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CONTENT
ABSTRACT ……………………………………………………………….…i
LIST OF TABLES ……………………………………………………….…iii
LIST OF FIGURES …………………………………………………….…..iii

1. INTRODUCTION ……………………………………………………..…1

2. EXPERIMENTAL …………………………………………………….…4
2.1 Materials ………………………………………………………….….4
2.2 Polymerization of PEDOT/PAA …………………………………....6
2.3 Fabrication of half cells ……………………………………………..8
2.4 Measurement and characterization ………………………………...9

3. RESULTS AND DISCUSSIONS ………………………………………11
3.1 Structure characterization ………………………………………...11
3.2 Evaluation of electrochemical and adhesion performance …..…22

4. CONCLUSION ………………………………………………………....31

5. REFERENCES …………………………………………………………32

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