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Development of Sn-based Anode for Sodium Ion Battery
Başlık:
Development of Sn-based Anode for Sodium Ion Battery
Yazar:
Wang, Wenhui, author.
ISBN:
9780438106321
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (115 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Özet:
In present thesis, several Sn-based alloys/composites are investigated as anode for sodium-ion battery (SIB).
We start our study with Sn-Co binary alloys. We find that there is a trade-off between cycle stability and sodiation/de-sodiation kinetics by manipulating the Co amount. In fact, the major problem associated with Sn-Co alloys turns to be the low reversible capacity resulting from the presence of inactive Co matrix with poor Na+ diffusion kinetics.
We then work on alternative matrixes of active materials including Sb, S and P. In SnSb alloy system, we identify that fast capacity decay caused by huge volume/stress changes upon charge/discharge process is a major problem, and constructing 3D porous carbon matrix together with reducing SnSb particle size stabilize the anode performance. We show that SnSbNPs 3D-C delivers a reversible capacity of ~332mAh/g with capacity retention of ~96.5% over 100 cycles at 100mA/g.
In SnS system, we show that progressive Sn agglomeration and crystalline Na2S enrichment at the end of de-sodiation process of the SnS electrode directly contribute to the capacity decay upon repeated cycles. By replacing the commonly adopted acetylene black conductive additive with multi-wall carbon nanotubes (MWCNT), the cycle stability of SnS electrode is largely improved, which correlates well with the observed suppression of both Sn agglomeration and Na2S enrichment at the end of de-sodiation. SnS-MWCNT electrode delivers a capacity of 465mAh/g with a capacity-retention of 84% over 50 cycles at 100mA/g. A full cell has been demonstrated as well with initial energy density of 262Wh/kg and 71% retention of the first discharge capacity after 40 cycles.
In Sn4P3 system, a major problem is its fast capacity decay mainly due to Sn agglomeration from Sn4P3 upon repeated cycles. We demonstrate that both Sn4P3 particle size reduction and TiC introduction to form Sn4P3/TiC composites can considerably improve the cycle performance of Sn4P3 due to the suppressed Sn agglomeration upon repeated cycles. At a current density of 100mA/g and a voltage range of 1.5-0.01V, Sn4P3 with primary particle sizes of ~500nm shows a high reversible capacity of ~500mA/g for more than 80 cycles and Sn4P3/30TiC composite retains 94.5% of initial de-sodiation capacity (~320mA/g) over 100 cycles.
Notlar:
School code: 1307
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(687331.1) | 687331-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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