期刊
ACS NANO
卷 12, 期 8, 页码 8169-8176出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b03278
关键词
germanium anodes; 1D nanostructures; lithium-ion batteries; metallothermic reduction reaction; electrospinning; in situ TEM characterization
类别
资金
- Center for Advanced Soft Electronics - Ministry of Science, ICT and Future Planning as Global Frontier Project [CASE-2015M3A6A5072945]
- National Research Foundation of Korea (NRF) [2014R1A4A1003712]
- Wearable Platform Materials Technology Center (WMC) - National Research Foundation of Korea (NRF) Grant of the Korean Government (MSIP) [2016R1A5A1009926]
- Office of Vehicle Technologies of the U.S. Department of Energy under the Advanced Battery Materials Research (BMR) program [DE-AC02-05CH11231, 18769, 6951379]
- DOE's Office of Biological and Environmental Research
- Department of Energy [DE-AC05-76RLO1830]
Nanowires (NWs) synthesized via chemical vapor deposition (CVD) have demonstrated significant improvement in lithium storage performance along with their outstanding accommodation of large volume changes during the charge/discharge process. Nevertheless, NW electrodes have been confined to the research level due to the lack of scalability and severe side reactions by their high surface area. Here, we present nanoporous Ge nanofibers (NPGeNFs) having moderate nanoporosity via a combination of simple electrospinning and a low-energetic zincothermic reduction reaction. In contrast with the CVD-assisted NW growth, our method provides high tunability of macro/microscopic morphologies such as a porosity, length, and diameter of the nanoscale 1D structures. Significantly, the customized NPGeNFs showed a highly suppressed volume expansion of less than 15% (for electrodes) after full lithation and excellent durability with high lithium storage performance over 500 cycles. Our approach offers effective 1D nanostructuring with highly customized geometries and can be extended to other applications including optoelectronics, catalysis, and energy conversion.
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