Details

Autor(en) / Beteiligte

• Zoller, Florian
• Peters, Kristina
• Zehetmaier, Peter M.
• Zeller, Patrick
• Döblinger, Markus
• Bein, Thomas
• Sofer, Zdeneˇk
• Fattakhova‐Rohlfing, Dina

Titel

Making Ultrafast High‐Capacity Anodes for Lithium‐Ion Batteries via Antimony Doping of Nanosized Tin Oxide/Graphene Composites

Ist Teil von

• Advanced functional materials, 2018-06, Vol.28 (23), p.n/a

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Tin oxide‐based materials attract increasing attention as anodes in lithium‐ion batteries due to their high theoretical capacity, low cost, and high abundance. Composites of such materials with a carbonaceous matrix such as graphene are particularly promising, as they can overcome the limitations of the individual materials. The fabrication of antimony‐doped tin oxide (ATO)/graphene hybrid nanocomposites is described with high reversible capacity and superior rate performance using a microwave assisted in situ synthesis in tert‐butyl alcohol. This reaction enables the growth of ultrasmall ATO nanoparticles with sizes below 3 nm on the surface of graphene, providing a composite anode material with a high electric conductivity and high structural stability. Antimony doping results in greatly increased lithium insertion rates of this conversion‐type anode and an improved cycling stability, presumably due to the increased electrical conductivity. The uniform composites feature gravimetric capacity of 1226 mAh g−1 at the charging rate 1C and still a high capacity of 577 mAh g−1 at very high charging rates of up to 60C, as compared to 93 mAh g−1 at 60C for the undoped composite synthesized in a similar way. At the same time, the antimony‐doped anodes demonstrate excellent stability with a capacity retention of 77% after 1000 cycles. Antimony‐doped tin oxide (ATO)/graphene nanocomposites are synthesized in a microwave‐assisted solvothermal approach in tert‐butyl alcohol. The resulting nanocomposites consist of laminated graphene oxide sheets homogeneously decorated with ATO nanoparticles. The hybrid structures reveal a very high gravimetric capacity and drastically improved rate performance and cycling stability, making them attractive as ultrafast high‐capacity anodes in lithium‐ion batteries.