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Chem Asian J. 2014 Oct;9(10):2859-65. doi: 10.1002/asia.201402549. Epub 2014 Jul 28.

Freeze-drying-assisted synthesis of hierarchically porous carbon/germanium hybrid for high-efficiency lithium-ion batteries.

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Key Laboratory of Cluster Science, Ministry of Education of China, Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Department of Chemistry, Beijing Institute of Technology, Beijing 100081 (P. R. China), Fax: (+86) 10-68918572.


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.


freeze drying; germanium; lithium-ion batteries; mesoporous materials; microporous materials

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