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114th General Meeting of Korean Chemical Society Ultrasound-assisted synthesis of Li2MnSiO4 nanoparticles for Li-ion battery

Submission Date :
8 / 28 / 2014 , 14 : 04 : 20
Abstract Number :
114082809428
Presenting Type:
Poster Presentation
Presenting Area :
무기화학
Authors :
황차환, 이경구1,*, 옥강민*
중앙대학교 화학과, Korea
1군산대학교 화학과, Korea
Assigned Code :
INOR.P-217 Assigend Code Guideline
Presenting Time :
10월 15일 (수요일) 16:00~19:00
Li2MnSiO4 (LMS) has been regarded as a promising cathode material for lithium ion battery because of its higher theoretical capacities (333mAh g-1) and thermal stability compared to lithium metal oxides. However, due to its poor electronic conductivity and slow Li-ion diffusion, particles of LMS are required to be nano-sized and carbon coated. By doing so, high rate capability and discharge capacity can be easily achieved. In this study, ultrasound-assisted reaction was adopted for the synthesis of LMS nanoparticles. The high power sonochemical reaction can induce an effective surface coating on template materials homogenously in a short reaction time. LMS precursors (nanosized-SiO2/Mn(OH)2/LiCOOH/carbon source) were prepared under ultrasound field for 40~60 min. The precursors were calcined at 700 oC for 12h under Ar atmosphere to obtain carbon coated crystallites. The synthesized LMS/C nanoparticles (20~50nm) crystallized in orthorhombic space group, Pmn21. The first cycle discharge capacity of synthesized LMS/C was about 200 mAh g-1 in the voltage range of 4.7~2 V and the current density was 16.5 mAh g-1.