웨어러블 디바이스, 전기자동차와 에너지저장시스템에 대한 전력 수요가 증가함에 따라 리튬이온 전지에 있어서 안전성은 가장 중요한 요소가 되었다. 이러한 문제를 해결하기 위해가연성의 유기 액체전해질이 불연성의 고체전해질로 대체된 전고체 전지를 제조하려는 연구들이 진행되고 있다. 그러나 고체전해질은 자체 이온전도도가 상대적으로 낮고 전극/전해질 계면에서 높은 저항이 발생하므로 실질적인 활용에 제약이 있었다. 이에 유무기 소재로 구성된 복합전해질은 고체전해질의 단점을 극복할 수 있는 대안으로 떠오르고 있다. 본 연구에서는 PEO 전해질과 LLZO 고체전해질을 복합화하여 전해질을 제조하였고, LLZO 고체전해질 함량에 따라 결정성, 형상 및 전기화학 성능 분석을 진행하였다. 결과로부터 PEO 전해질 내에 LLZO 고체전해질의 최적 함량 및 균일한 분포가 전체 복합전해질의 이온전도도 향상에 중요한 요소임을 확인하였다.
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