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Freeze‐Drying‐Assisted Synthesis of Hierarchically Porous Carbon/Germanium Hybrid for High‐Efficiency Lithium‐Ion Batteries
Author(s) -
Xiao Ying,
Cao Minhua
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201402549
Subject(s) - materials science , lithium (medication) , anode , microporous material , carbon fibers , nanoparticle , chemical engineering , nanotechnology , hybrid material , nanomaterials , mesoporous material , germanium , porosity , ion , composite number , optoelectronics , composite material , electrode , chemistry , silicon , organic chemistry , catalysis , medicine , engineering , endocrinology
Abstract Herein, an approach is reported to prepare porous a carbon/Ge (C/Ge) hybrid. In this hybrid, Ge nanoparticles are closely embedded in a highly conductive and flexible carbon matrix. Such a hybrid features a high surface area (128.0 m 2 g −1 ) and a hierarchical micropore–mesopore structure. When used as an anode material in lithium‐ion batteries (LIBs), the as‐prepared hybrid [C/Ge (60.37 %)] exhibits an improved lithium storage performance with regard to its capacity and rate capability compared to its counterparts. More specifically, it can maintain a specific capacity as high as 906 mAh g −1 at a high current density of 0.6 A g −1 after 50 cycles. The excellent lithium storage performance of the C/Ge (60.37 %) sample can be attributed to synergetic effects between the carbon matrix and Ge nanoparticles. The method we adopted is simple and effective, and can be extended to fabricate other nanomaterials.