材料科学
阳极
锑
纳米线
铜
化学工程
电化学
光电子学
纳米技术
冶金
电极
工程类
物理化学
化学
作者
Sumair Imtiaz,Nilotpal Kapuria,Ibrahim Saana Amiinu,Abinaya Sankaran,Shalini Singh,Hugh Geaney,Tadhg Kennedy,Kevin M. Ryan
标识
DOI:10.1002/adfm.202209566
摘要
Abstract Antimony (Sb) is a promising anode material for potassium‐ion batteries (PIBs) due to its high capacity and moderate working potential. Achieving stable electrochemical performance for Sb is hindered by the enormous volume variation that occurs during cycling, causing a significant loss of the active material and disconnection from conventional current collectors (CCs). Herein, the direct growth of a highly dense copper silicide (Cu 15 Si 4 ) nanowire (NW) array from a Cu mesh substrate to form a 3D CC is reported that facilitates the direct deposition of Sb in a core‐shell arrangement (Sb@Cu 15 Si 4 NWs). The 3D Cu 15 Si 4 NW array provides a strong anchoring effect for Sb, while the spaces between the NWs act as a buffer zone for Sb expansion/contraction during K–cycling. The binder‐free Sb@Cu 15 Si 4 anode displays a stable capacity of 250.2 mAh g −1 at 200 mA g −1 for over 1250 cycles with a capacity drop of ≈0.028% per cycle. Ex situ electron microscopy revealed that the stable performance is due to the complete restructuring of the Sb shell into a porous interconnected network of mechanically robust ligaments. Notably, the 3D Cu 15 Si 4 NW CC is expected to be widely applicable for the development of alloying‐type anodes for next‐generation energy storage devices.
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