1. Highly Connected Silicon-Copper Alloy Mixture Nanotubes as High-Rate and Durable Anode Materials for Lithium-Ion Batteries.
- Author
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Song, Hucheng, Wang, Hong Xiang, Lin, Zixia, Jiang, Xiaofan, Yu, Linwei, Xu, Jun, Yu, Zhongwei, Zhang, Xiaowei, Liu, Yijie, He, Ping, Pan, Lijia, Shi, Yi, Zhou, Haoshen, and Chen, Kunji
- Subjects
LITHIUM-ion batteries ,SILICON alloys ,NANOTUBES ,DURABILITY ,ANODES ,ELECTRIC vehicles - Abstract
Seeking high-capacity, high-rate, and durable anode materials for lithium-ion batteries (LIBs) has been a crucial aspect to promote the use of electric vehicles and other portable electronics. Here, a novel alloy-forming approach to convert amorphous Si (a-Si)-coated copper oxide (CuO) core-shell nanowires (NWs) into hollow and highly interconnected Si-Cu alloy (mixture) nanotubes is reported. Upon a simple H
2 annealing, the CuO cores are reduced and diffused out to alloy with the a-Si shell, producing highly interconnected hollow Si-Cu alloy nanotubes, which can serve as high-capacity and self-conductive anode structures with robust mechanical support. A high specific capacity of 1010 mAh g−1 (or 780 mAh g−1 ) has been achieved after 1000 cycles at 3.4 A g−1 (or 20 A g−1 ), with a capacity retention rate of ≈84% (≈88%), without the use of any binder or conductive agent. Remarkably, they can survive an extremely fast charging rate at 70 A g−1 for 35 runs (corresponding to one full cycle in 30 s) and recover 88% capacity. This novel alloy-nanotube structure could represent an ideal candidate to fulfill the true potential of Si-loaded LIB applications. [ABSTRACT FROM AUTHOR]- Published
- 2016
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