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Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries
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Malik, Romeo, Huang, Qianye, Silvestri, Laura, Liu, Danqing, Pellegrini, Vittorio, Marasco, Luigi, Venezia, Eleonora, Abouali, Sara, Bonaccorso, Francesco, Lain, Michael J., Greenwood, David, West, Geoff, Shearing, Paul and Loveridge, Melanie (2020) Synthesis of layered silicon-graphene hetero-structures by wet jet milling for high capacity anodes in Li-ion batteries. 2D Materials, 8 (1). 015012. doi:10.1088/2053-1583/aba5ca
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WRAP-synthesis-layered-silicon-graphene-hetero-structures-wet-jet-milling-high-capacity-anodes-Li-ion-batteries-Loveridge-2020.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution. Download (2440Kb) | Preview |
Official URL: https://doi.org/10.1088/2053-1583/aba5ca
Abstract
While silicon-based negative electrode materials have been extensively studied, to develop high capacity lithium-ion batteries, implementing a large-scale production method that can be easily transferred to industy, has been a crucial challenge. Here, a scalable wet-jet milling method was developed to prepare a silicon-graphene hybrid material to be used as negative electrode in lithium-ion batteries. This synthesized composite, when used as an anode in lithium cells, demonstrated high Li ion storage capacity, long cycling stability and high-rate capability. In particular, the electrode exhibited a reversible discharge capacity exceeding 1763 mAh g-1 after 450 cycles with a capacity retention of 98% and a coulombic efficiency of 99.85% (with a current density of 358 mA g-1). This significantly supersedes the performance of a Si-dominant electrode structures. The capacity fade rate after 450 cycles was only 0.005% per cycle in the 0.05-1 V range. This superior electrochemical performance is ascribed to the highly layered, silicon-graphene porous structure, as investigated via focused ion beam in conjunction with scanning electron microscopy (FIB-SEM) tomography. The hybrid electrode could retain 89% of its porosity (under a current density of 358 mA g-1) after 200 cycles compared with only 35% in a Si-dominant electrode. Moreover, this morphology can not only accommodate the large volume strains from active silicon particles, but also maintains robust electrical connectivity. This confers faster transportation of electrons and ions with significant permeation of electrolyte within the electrode. Physicochemical characterisations were performed to further correlate the electrochemical performance with the microstructural dynamics. The excellent performance of the hybrid material along with the scalability of the synthesizing process is a step forward to realize high capacity/energy density lithium-ion batteries for multiple device applications.
| Item Type: | Journal Article | |||||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | |||||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | |||||||||
| Library of Congress Subject Headings (LCSH): | Lithium ion batteries -- Materials, Electric batteries -- Electrodes, Jet mills, Silicon, Graphene, Heterostructures | |||||||||
| Journal or Publication Title: | 2D Materials | |||||||||
| Publisher: | IOP Publishing | |||||||||
| ISSN: | 2053-1583 | |||||||||
| Official Date: | 30 October 2020 | |||||||||
| Dates: |
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| Volume: | 8 | |||||||||
| Number: | 1 | |||||||||
| Article Number: | 015012 | |||||||||
| DOI: | 10.1088/2053-1583/aba5ca | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access | |||||||||
| RIOXX Funder/Project Grant: |
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