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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Battery Performance of Morphology-Controlled LiNi0.5Mn1.5O4 Cathodes

2012년 2월 4일 12시 40분 41초
ELEC.P-1221 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
홍순기, 여인형1, 모선일
아주대학교 에너지시스템학부 화학, Korea
1동국대학교 화학과, Korea
Nickel substituted LiNi0.5Mn1.5O4 spinel is one of the most promising candidates with a high operating voltage at 4.7 V versus Li+/Li. In the case of LiMn2O4 spinel, the cathodes suffer from poor cycling efficiency for long life operating, especially at high temperature, which was caused by the structural instability and the dissolution of manganese ions. The LiNi0.5Mn1.5O4 spinel has a good cycling performances and good thermal stability by doping nickel into the lattices. In addition to the intrinsic properties of the material, the morphology plays a key role in its electrochemical performance. The morphology controlled LiNi0.5Mn1.5O4 has different characteristics, due to their structural variety, surface composition and diffusion lengths for Li ion. In this work, octahedral- and rod-shaped LiNi0.5Mn1.5O4 was prepared by hydrothermal and by using proper precursors and by following heat treatment. Each morphology cathodes has different space group as Fd-3m and P4332. Crystalline phases, structure, and the morphology were characterized by using an X-ray diffraction (RigakuD/max 2700V/VP), Neutron diffraction and a scanning electron microscope (JEOL JSM-6380). The lithium batteries were assembled in a coin-type (CR2032) cell in a dry room and the batteries were cycled galvanostatically in a potential range of 3.5 ? 5.0 V at various C rates, using multichannel battery test mode. The comparing of those materials will be discussed in detail.