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대한화학회 제124회 학술발표회 및 총회 Dry-deposition of LiNbO3 or Li2ZrO3 on LiNi0.6Co0.2Mn0.2O2 assisted by resonant-acoustic technique for all-solid-state lithium batteries

등록일
2019년 8월 20일 11시 18분 51초
접수번호
0486
발표코드
ELEC.P-404 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Youngjin Kim, Kwang Sun Ryu*
Department of Chemistry, University of Ulsan, Korea
The LiNbO3 or Li2ZrO3 nanoparticles were coated on LiNi0.6Co0.2Mn0.2O2 (NCM) cathode material (NCM) by resonant-acoustic coating technique for all-solid-state lithium batteries (ASSLB). We have produced LiNbO3 (50~100 nm) or Li2ZrO3 (30~60 nm) nanoparticles, which are the suitable electrode coating agents since it can suppress direct contact sulfide-based solid electrolyte and decrease contact loss along with elimination of the space-charge layer. ASSLB using LiNbO3 or Li2ZrO3-coated NCM materials showed higher capacity than bare NCM. X-ray diffraction patterns showed the same peak separations and lattice parameters as bare NCM. The images of SEM and TEM were analyzed with electron dispersive spectroscopy mapping, which represents homogeneous coating with a uniform LiNbO3 or Li2ZrO3 layer of 50 ~ 200 nm. XPS measurements revealed that the surface of NCM had two different O1s peaks, Nb-O peak, and Ni, Co, Mn, Nb peaks. Electrochemical studies on bare NCM and LiNbO3 or Li2ZrO3 coated NCM materials were elucidated using electrochemical impedance spectroscopy and galvanostatic cycle performances by ASSLB cells with c-rate performances. Especially, the 3 wt.% LiNbO3-coated NCM exhibited capacity retention of 84% at a current density of 15 mA/g during 20 cycles, while that of the bare NCM exhibited capacity retention of 16.1%.

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