Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 844, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156207
Keywords
SiO2 nanowires; Arc-discharge plasma; Anode materials; Lithium ion battery
Categories
Funding
- National Natural Science Foundation of China of China [U1908220]
Ask authors/readers for more resources
Catalyst (Mn)-induced growth of random SiO2 nanowires (NWs) was in-situ accomplished by direct current (DC) arc-discharge plasma. An instantaneous vapor-liquid-solid (VLS) mechanism was proposed for the formation of the SiO2/Mn NWs, evidenced by optical emission spectroscopy (OES) diagnoses on the high-temperature plasma and analyses of Gibbs free energies on the basis of Ellingham diagram. Electrochemical behaviors of SiO2/Mn NWs electrode showed a specific capacity of 1333.6 mAh,g(-1) at the current density of 0.1 A g(-1), with a Columbic efficiency of 98.1% after 100 cycles. The diffusion of Li+ ions in the SiO2/Mn NWs electrode was further promoted by consecutive cycling, which was attributed to the ionically conductive products of Li2O and lithium silicate in the SEI layer, revealed by the Lithorn diffusion coefficient (2.64 x 10(-17) cm(2) s(-1)) in the initial electrode and a varied value of 8.97 x 10(-17) cm(2) s(-1) in the subsequently cycled electrode. The excellent cycling stability of the SiO2/Mn NWs electrode was ascribed to the random SiO2 nanowires with one-dimensional structure, the uniformly embed Si species in the buffer matrix by cycling, and the positive contribution from the residual catalyst of Mn nanoparticles. The unique morphology and composition of the SiO2/Mn NWs brought in an excellent rate capability, i.e. the reversible capacity of 1076.4 mAh,g(-1) at a current density of 0.1 A g(-1) was adequately recovered after suffering from intense current impacts up to 2.0 A g(-1). (c) 2020 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available