화학공학소재연구정보센터
Korean Chemical Engineering Research, Vol.57, No.2, 267-273, April, 2019
계층적 다공구조를 갖는 Fe2O3 나노섬유의 리튬 이차전지 음극소재 적용
Application of Hierarchically Porous Fe2O3 Nanofibers for Anode Materials of Lithium-ion Batteries
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초록
본 연구는 메조-, 마크로- 기공이 상호 연결된 계층적 다공구조를 갖는 Fe2O3 나노섬유를 전기방사 및 후 열처리 과정을 통해 합성하였다. 구조체 내 마크로 기공은 Fe(acac)3/polyacrylonitrile 연속상을 포함하는 섬유 내 분산상으로 존재하는 polystryrene을 열처리 과정 중 선택적으로 분해함으로써 생성시켰다. 또한, 전기방사 공정 동안 침투된 수분의 기화로 형성된 메조 기공은 마크로 기공과 상호연결되어 최종 계층적 다공구조를 갖는 Fe2O3 나노섬유를 형성했다. 계층적 다공구조를 갖는 Fe2O3 나노섬유의 초기 방전용량과 Coulombic 효율은 1.0 A g-1의 전류밀도에서 1190 mA h g-1, 79.2% 였으며, 1000 사이클 후의 방전 용량은 792 mA h g-1였다. 계층적 다공구조를 갖는 Fe2O3 나노섬유는 높은 구조적 안정성과 형태학적 이점으로 인해 우수한 리튬 이온 저장 성능을 나타냈다.
Hierarchically porous Fe2O3 nanofibers with meso- and macro- pores are designed and synthesized by electrospinning and subsequent heat-treatment. The macro pores are generated by selectively decomposition of polystyrene as a dispersed phase in the as-spun fibers containing Fe(acac)3/polyacrylonitrile continuous phases during heattreatment. Additionally, meso-pores formed by evaporation of infiltrated water vapor during electrospinning process interconnected the macro-pores and results in the formation of hierarchically porous Fe2O3 nanofibers. The initial discharge capacity and Coulombic efficiency of the hierarchically porous Fe2O3 nanofibers at a current density of 1.0 A g-1 are 1190 mA h g-1 and 79.2%. Additionally, the discharge capacity of the nanofibers is 792 mA h g-1 after 1,000 cycles. The high structural stability and morphological benefits of the hierarchically porous Fe2O3 nanofibers resulted in superior lithium ion storage performance.
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