2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 12: Energy Production and Secondary Batterie
| Editors: | F. Kongoli, H. Dodds, M. Mauntz, T. Turna, K. Aifantis, A. Fox, V. Kumar |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2019 |
| Pages: | 112 pages |
| ISBN: | 978-1-989820-11-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Novel Carbon - Ultrafine Silicon Composite Anode for High-Performance Lithium-Ion Batteries
Dmitry Yarmolich1; Dzianis Yarmolich2; Yaroslav Odarchenko3; Carmen Murphy4; Enrico Petrucco4; Vasant Kumar5; Rumen Tomov5;1PLASMA APP LTD, OX11 0QX, United Kingdom; 2PLASMA APP LTD, Oxford , OX11 0QX, United Kingdom; 3PLASMA APP LTD, Oxford OX11 0QX, United Kingdom; 4JOHNSON MATTHEY BATTERY MATERIALS, Reading RG4 9NH, United Kingdom; 5UNIVERSITY OF CAMBRIDGE, Cambridge, United Kingdom;
Type of Paper: Regular
Id Paper: 352
Topic: 14
Abstract:
Silicon (Si) has been widely considered as potential high capacity anode material in Li-ion batteries due to its desirable properties: (i) high theoretical specific capacity (1672 mA h g-1), (ii) nontoxicity and (iii) low cost and natural abundance [1]. Despite its favourable comparison to commercial graphite anodes (theoretical capacity of 372 mA h g-1), the implementation of bulk Si anode has been hindered by the large volume change during the charging and discharging cycle (~ 300%). Such structural instability results in loss of contact with the other electrode constituents and self-destruction [2]. Another adverse feature is the limited Li+ ion diffusivity and electronic conductivity of bulk Si at room temperature.
A scalable method of producing carbon (ultrafine silicon composite electrode) was developed using the Virtual Cathode Deposition technique [3]. As-deposited coatings contained silicon nano-crystallites encapsulated in a novel polymorph of mesoporous disordered carbon matrix. The architecture of the electrode offers close-order integration of both materials ensuring fast Li+ ion diffusivity and mixed-(ionic/electronic) conductivity as well as alleviating Si volume change during cycling. The composite carbon polymorph-silicon anode tested versus Li displayed a first cycle specific capacity of more than 2000 mAh g-1 retaining in the following cycles ~1200 mAh g-1 at a 0.1C rate. The good cyclability (over 80 cycles) demonstrated the effectiveness of such Si - carbon encapsulation, addressing the instability issues of Si-based anodes.
Keywords:
Anodes; Electrochemistry; Li-Ion; SecondaryBattery;References:
[1] P. G. Bruce, S. A. Freunberger, L. J. Hardwick and J. M. Tarascon, Nat. Mater., 2012, 11, 19–29.[2] Li B, Xiao Q, Luo Y (2018) A modified synthesis process of three dimensional sulfur/graphene aerogel as binder-free cathode for lithium-sulfur batteries. Mater Des 153:9–14
[3] D. Yarmolich, D. Virtual cathode deposition (vcd) for thin film manufacturing WO2016042530A1. (2015).