Polypyrrole (PPy) was made by an emulsion polymerization using iron(III) chloride (FeCl3) as an initiator and dodecyl benzene sulfuric acid (DBSA) as an emulsifier and dopant. Poly(2,6-dimethyl-1,4-phenylene oxide)(PPO) was sulfonated by chlorosulfonic acid (CSA). The cathode was composed of PPy+DBS- complex, conductor powder, and PPO or sulfonated poly(2,6-dimethyl-1,4- phenylene oxide)(SPPO) as a binder or dopant. The charge-discharge performance of PPy+DBS-/SPPO cathode was increased as the extent of about 50% than PPy+DBS-/PPO. This is because SPPO played a role as a binder as well as a dopant. In addition, sulfonation brings out the increase of miscibility between PPy and SPPO, and the increase of contact area between cathode and electrolyte.

PPy+DBS- 복합체는 유화중합에 의해 제조되었고 이때 iron(Ⅲ) chloride(FeCl3)는 개시제로, dodecyl benzene sulfonic acid(DBSA)는 계면활성제 및 도판트로 사용되었다. Poly(2,6-dimethyl-1,4-phenylene oxide)(PPO)는 chlorosulfonic acid(CSA)를 사용하여 설폰화되었고 양극은 PPy+DBS- 복합체, 도전제 그리고 바인더로 구성되며 이때 바인더로 PPO와 설폰화된 poly(2,6-dimethyl-1,4-phenylene oxide)(SPPO)를 사용하였다. PPy+DBS-/SPPO 양극은 PPy+DBS-/PPO에 비해 약 50% 높은 충ㆍ방전 성능을 나타내었는데 이는 SPPO가 바인더뿐만 아니라 도판트로 작용했기 때문이다. 더욱이 바인더로 사용된 고분자의 설폰화는 전도성 고분자와의 coulombic attraction을 유발시켜 두 상간의 혼화성을 증가시켰을 뿐만 아니라 양극과 전해질 사이의 접촉면적을 증가시켜 전기화학적으로 우수한 성능을 나타나게 했다.

Keywords: polypyrrole; sulfonation; poly(2,6-dimethyl-1,4-phenylene oxide); electrochemical property