A novel spring-structured coaxial hierarchical SiO@CoO nanowire as a lithium-ion battery anode and its in situ real-time lithiation.

Author(s) Han, T.; Ding, Y.; Chen, Y.; Cheng, D.; Zhou, P.; Liu, J.
Journal Nanotechnology
Date Published 2020 Jan 17

High capacity and stable anodes are demanded since the current graphite-based anode does not meet the high-performance requirements of emerging Li-ion battery systems. Herein, we present a novel spring-shaped hierarchical SiO@CoO nanowire composite, which exhibits good Li-storage performance. The special structure is able to effectively accommodate the change in structure during charge-discharge, and the coaxial hierarchical morphology enables rapid Li ion and electron transfer. The spring-shaped SiO@CoO anode exhibits a capacity of 770 mAh g, along with a high Coulombic efficiency of 99.8% after 400 cycles. A stable rate performance even after three rounds of measurements is also achievable. In addition, the real-time lithiation of the SiO@CoO composite is investigated through an in situ transmission electron microscopy technology, which demonstrates the stable structure of the spring-shaped SiO@CoO composite during the rapid lithiation process.

DOI 10.1088/1361-6528/ab4848
ISSN 1361-6528
Citation Nanotechnology. 2020;31(3):035401.

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