탄소를 첨가한 Li3V2(PO4)3의 합성 및 전기화학적 특성
Synthesis and Electrochemical Characteristics of Carbon added Li3V2(PO4)3
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초록
본 연구에서는 탄소를 첨가하여 Li3V2(PO4)3의 낮은 전기전도도를 개선시켜서 고율 방전특성,충·방전 사이클 특성을 향상시키는 것을 목적으로 하고 있다. 탄소 첨가제로는 글루코스와CNT (carbon nano tube)를 사용하였으며, 탄소의 첨가 여부와 탄소 원료의 종류에 따라 합성된 Li3V2(PO4)3의 구조적 그리고 전기화학적 특성에 대해 연구를 하였다. Li3V2(PO4)3와Li3V2(PO4)3/C 및 Li3V2(PO4)3/CNT의 합성방법으로는 고상법을 이용하였다. 합성된 물질을 수소환원방법을 통하여 600, 700, 800, 900oC에서 소성해주었다. 합성된 물질로 양극 집전판을 제작하여 상대전극을 리튬메탈로 한 Coin 2032 cell을 만들어 전기화학적 특성분석을 진행하였다. 전지테스트는 정전류법을 이용하여 3.0~4.8 V까지 충·방전 실험을 하였다.
Abstract
The purpose of this study was to improve the conductivity of Li3V2(PO4)3 by adding carbon source so that the discharge rate and cyclic properties were improved. Glucose and CNT were added to Li3V2(PO4)3 and the structure and electrochemical properties were studied. Li3V2(PO4)3, Li3V2(PO4)3/C and Li3V2(PO4)3/CNT were synthesised by solid state reaction using hydrogen reduction method at 600, 700, 800, 900oC. The cathode materials were assembled to coin cell type 2032 with Lithium metal as a counter electrode. The coin cell was galvanostatically evaluated in the voltage range of 3.0~4.8 V.
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