☆ 4.8 Article

Mesoporous Hollow Ge Microspheres Prepared via Molten-Salt Metallothermic Reaction for High-Performance Li-Storage Anode

ACS APPLIED MATERIALS & INTERFACES (2018)

期刊

ACS APPLIED MATERIALS & INTERFACES

卷 10, 期 10, 页码 8399-8404

出版社

AMER CHEMICAL SOC

DOI: 10.1021/acsami.8b00567

关键词

molten salt; metallothermic reduction; mesoporous structure; Ge anode; hollow microspheres

类别

Nanoscience & Nanotechnology Materials Science, Multidisciplinary

资金

National Postdoctoral Program for Innovative Talents [BX201600140]
China Postdoctoral Science Foundation [2016M600484]
Fundamental Research Funds for the Central Universities [WK2060190078]
National Natural Science Foundation of China [21701163, 21671181]

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摘要

Generally, Ge-based anodes are prepared by metallothermic reduction of GeO2 with Mg at 650 degrees C. Herein, a molten-salt system is developed a low-temperature metallothermic reduction of GeO2 to prepare nanostructured Ge based anode materials. Typically, mesoporous hollow Ge microspheres are prepared by reduction of GeO2 with metallic Mg in molten ZnCl2 (mp 292) at 350 degrees C. Monodispersed Ge particles are synthesized through reduction of GeO2 with Mg in molten AlCl3 (mp 192 degrees C) at 250 degrees C. The meso-porous Ge anode delivers the reversible capacity of 1291 mA h g(-1) at 0.2 C after 150 cycles with a retention of 97.3%, 1217 mA h g(-1) at 0.8 C after 400 cycles with a retention of 91.9%, and superior rate capability with a capacity of 673 mA h g(-1) even at 10 C. Then, the reaction mechanism and full-cell performance of as-prepared Ge anodes are studied systemically.

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