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Flexible Dimensional Control of High‐Capacity Li‐Ion‐Battery Anodes: From 0D Hollow to 3D Porous Germanium Nanoparticle Assemblies
Author(s) -
Park MiHee,
Kim Kitae,
Kim Jeyoung,
Cho Jaephil
Publication year - 2010
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200901846
Subject(s) - materials science , germanium , nanoparticle , porosity , anode , ion , nanotechnology , chemical engineering , battery (electricity) , volume fraction , composite material , electrode , optoelectronics , organic chemistry , chemistry , power (physics) , physics , quantum mechanics , silicon , engineering
Simple physical blending of SiO 2 and ethyl‐capped Ge gels leads to flexible dimensional control of Ge nanoparticles, and an increasing weight fraction of the latter leads to ordered 3D porous nanoparticle assemblies (see figure). The long‐range ordering of the 3D porous Ge nanoparticles and their very thin pore wall thicknesses (<20 nm) induce excellent cycling performance, showing only a 2% capacity decrease after 100 cycles.