리튬이차전지용 탄소 코팅된 Li2MnSiO4 양극활물질의 상형성 거동 및 충방전 특성
Phase Formation Behavior and Charge-discharge Properties of Carbon-coated Li2MnSiO4 Cathode Materials for Lithium Rechargeable Batteries
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초록
Planetary ball mill과 고상반응법을 사용하여 실리케이트계 탄소 코팅된 Li2MnSiO4 양극활물질분말을 합성하였으며 충방전 특성을 조사하였다. 전기화학적 활성을 지니는 β-Li2MnSiO4 상을형성하기 위하여 하소* 온도와 분위기를 조절하였으며 β-Li2MnSiO4 단일상에 가까운 탄소 코팅된 Li2MnSiO4 활물질 분말을 제조할 수 있었다. 합성된 분말은 100 nm 정도 크기의 1차 입자가 뭉쳐있는 2차 입자 형태를 보였다. Li2MnSiO4 활물질에서 Li의 삽입/탈리가 가능하려면 탄소의 첨가가 필요하였으며, 4.8 wt%의 탄소가 코팅된 Li2MnSiO4 활물질에서 초기용량 192 mAh/g 를 얻을 수 있었다.
Abstract
Carbon-coated Li2MnSiO4 powders as the active materials for the cathode were synthesized by planetary ball milling and solid-state reaction, and their phase formation behavior and charge-discharge properties were investigated. Calcination temperature and atmosphere were controlled in order to obtain the β-Li2MnSiO4 phase, which was active electrochemically, and the carbon-coated Li2MnSiO4 active material powders with near single phase β-Li2MnSiO4 could be fabricated. The particles of the synthesized powders were secondary particles composed of primary ones of about 100 nm size. The carbon incorporation was essential to enable the Li ions to be inserted and extracted from Li2MnSiO4 active materials, and the initial capacity of 192 mAh/g could be obtained in the Li2MnSiO4 active materials with 4.8 wt% of carbon.
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