Core-shell Structured BaTiO<SUB>3</SUB>@SnO<SUB>2</SUB> Microsphere Composite as Li-ion Battery Anode with Enhanced Electrochemical Performance
발표자
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초록
내용
Due to the low specific capacity (372 mAh/g) of graphite as a Li-ion battery (LIB) anode, we developed BaTiO3-coated SnO2 microsphere composite (SnO2@BaTiO3) as a novel anode exhibiting superior electrochemical performance. The composites were synthesized by barium titanate coating on the surface of tin oxide followed by carbonization at the N2 atmosphere. As-formed composites show reduced irreversible loss of active masses because of the mechanical pressures occurred from high volumetric change of tin oxide during charge/discharge process. The mechanical pressure generates electric fields and piezoelectric potential allows its enhanced Li+ mobility owing to the polarization of barium titanate particles in charge/discharge process. Our SnO2@BaTiO3 composite exhibited the improved electrochemical performance as LIB anode of good rate performance and moderate cycle stability.