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Temperature Dependent Li Storage Performance in Nanoporous Cu-Ge-Al Alloy.
ACS Applied Materials & Interfaces 2019 Februrary 12
Lithium ion batteries (LIBs) process performance fading and safety concerns at low temperature (LT) prohibit their application in cold climates. The alloy-type electrodes demonstrate great potentials in stable and dendrite-free anodes at LT. Herein, we report a temperature-dependent Li-storage performance in Al-based nanoporous alloy anode. The nanoporous-structured Cu-Ge-Al ternary alloys (NP-CuGeAl) have been designed and prepared by selectively etching Al out. The high Al-content NP-CuGeAl (acid etching for 6 h, named as CGA-6) is composed of multi-intermetallic compounds (denoted as MxNy, M, N = Cu, Al, Ge) with bimodal porous architectures. Investigated as anode, at room temperature (RT), the CGA-6 delivers a capacity as high as 479.7 mAh g-1 at 0.5 A g-1 over 1020 cycles. And the low Al-content ones show improved LT electrochemical performance. At -20 °C, the CGA-48 (acid etching for 48h) shows much better performance as compared with the CGA-6. In situ TEM and ex situ characterizations confirm that the MxNy/LizMxNy couples are highly reversible and the porous structure is durable upon battery cycling.
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