Intramolecular deformation of zeotype-borogermanate toward a three-dimensional porous germanium anode for high-rate lithium storage

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Journal of Materials Chemistry A, ISSN: 2050-7488, Vol: 6, Issue: 33, Page: 15961-15967

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Yoon, Taeseung; Song, Gyujin; Harzandi, Ahmad M.; Ha, Miran; Choi, Sungho; Shadman, Sahar; Ryu, Jaegeon; Bok, Taesoo; Park, Soojin; Kim, Kwang S.
Royal Society of Chemistry (RSC); ROYAL SOC CHEMISTRY
Chemistry; Energy; Materials Science
article description
We demonstrate a new class of synthetic process for three-dimensional porous Ge materials (3D-pGe). Starting from zeotype-borogermanate microcubes, the 3D-pGe sample was synthesized through a thermal deformation of artificial Ge-rich zeolite, etching, and subsequent hydrogen reduction. After the synthesis, the resultant byproducts were simply removed by warm water instead of a harmful etchant such as hydrofluoric acid. Benefiting from the structural advantages with meso/macro porosity in the overall framework, the as-prepared 3D-pGe exhibits good electrochemical properties as anode materials for lithium-ion batteries with a high capacity (770 mA h g), cycling stability (capacity retention over 83%) after 250 cycles at 1C, and excellent rate capability (32% for 10C with respect to C/5) as well as pseudocapacitive contribution by surface-controlled reaction. This study paves the way to a new synthesis strategy of 3D porous Ge anode materials from zeolite for large-scale energy storage applications.