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Title: Atomic-scale combination of germanium-zinc nanofibers for structural and electrochemical evolution

Journal Article · · Nature Communications

Alloy materials have been emerged to achieve compatible properties in various applications. The structural manipulation, however, requires sensitive and complicated synthetic process. Herein, we report atomic-scale combination of germanium-zinc distorted alloy exhibiting uncertain eutectic point in a phase diagram can imply a great potential to form atomically collaborated array via a simple fabrication method. When interconnected together, it prevents a fatal sublimation of germanium/germanium oxide during gas-solid phase reduction reaction and allows outstanding electronic conductivity as well as high available capacity in lithium-ion batteries, leading to structural and electrochemical evolution of germanium/zinc distorted array. Further, the unique features are clearly confirmed through in situ analysis. Besides, as-prepared battery anodes remarkably highlights outstanding rate capabilities (capacity retention of ~50% at 20 C compared to 0.2 C-rate) and cycle retention (73% at 3.0 C-rate) with a capacity of 546 mAh g-1 even after 1000 cycles. Even when assembled in a full cell, it notably facilitates considerable energy density during 400 cycles with 99.4% of average coulombic efficiency, which is suitable for a large-scale energy storage system.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1543296
Report Number(s):
PNNL-SA--135597
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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