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High rate and durable, binder free anode based on silicon loaded MoO3 nanoplatelets.

Martinez-Garcia A, Thapa AK, Dharmadasa R, Nguyen TQ, Jasinski J, Druffel TL, Sunkara MK - Sci Rep (2015)

Bottom Line: Li2MoO4 and Li(1.333)Mo(0.666)O2 were identified as the products of lithiation of pristine MoO3 nanoplatelets and silicon-decorated MoO3, respectively, accounting for lower than previously reported lithiation potentials.MoO3 nanoplatelet arrays were deposited using hot-wire chemical vapor deposition.Silicon decorated MoO3 nanoplatelets exhibited enhanced capacity of 1037 mAh g(-1) with exceptional cyclability when charged/discharged at high current densities of 10 A g(-1).

View Article: PubMed Central - PubMed

Affiliation: 1] Department of Chemical Engineering University of Louisville Louisville, KY 40292. [2] Conn Center for Renewable Energy Research.

ABSTRACT
In order to make fast-charging batteries a reality for electric vehicles, durable, more energy dense and high-current density resistant anodes need to be developed. With such purpose, a low lithiation potential of 0.2 V vs. Li/Li(+) for MoO3 nanoplatelet arrays is reported here for anodes in a lithium ion battery. The composite material here presented affords elevated charge capacity while at the same time withstands rapid cycling for longer periods of time. Li2MoO4 and Li(1.333)Mo(0.666)O2 were identified as the products of lithiation of pristine MoO3 nanoplatelets and silicon-decorated MoO3, respectively, accounting for lower than previously reported lithiation potentials. MoO3 nanoplatelet arrays were deposited using hot-wire chemical vapor deposition. Due to excellent voltage compatibility, composite lithium ion battery anodes comprising molybdenum oxide nanoplatelets decorated with silicon nanoparticles (0.3% by wt.) were prepared using an ultrasonic spray. Silicon decorated MoO3 nanoplatelets exhibited enhanced capacity of 1037 mAh g(-1) with exceptional cyclability when charged/discharged at high current densities of 10 A g(-1).

No MeSH data available.


Related in: MedlinePlus

a) Cyclic voltammogram (CV) for as-deposited MoO3 nanoplatelet arrays, (MoO3 loading: 0.9 mg) (0.5 mg cm−2); b) Cyclic voltammogram (CV) for Silicon-sprayed MoO3 (MoO3 loading: 1.1 mg, Si loading: 25 sprays ~15 μg Si, ~1.3 wt% Si ) (MoO3 0.625 mg cm−2, Si 8.5 μg cm−2).
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f2: a) Cyclic voltammogram (CV) for as-deposited MoO3 nanoplatelet arrays, (MoO3 loading: 0.9 mg) (0.5 mg cm−2); b) Cyclic voltammogram (CV) for Silicon-sprayed MoO3 (MoO3 loading: 1.1 mg, Si loading: 25 sprays ~15 μg Si, ~1.3 wt% Si ) (MoO3 0.625 mg cm−2, Si 8.5 μg cm−2).

Mentions: For the electrochemical characterization, select set of anode samples were loaded with between 0.3 to 1.3 wt% of silicon on MoO3. Figure 2a and b show cyclic voltammograms obtained at a scan rate of 1 mV s−1 for as-synthesized MoO3 and Si@MoO3 respectively. In the pristine MoO3 anode (Fig. 2a), three cathodic waves are observed in the 3 V – 5 mV window for the first cathodic polarization sweep (discharging) at 2.65 V, 2.19 V and 75 mV. In the reverse scan (charging), the oxidation waves are seen around 0.5 V, 1.25 V and 1.5 V. Important evidence of irreversibility is observed in the subsequent cycles as the reduction waves over 2 V are not present anymore, and the cathodic peak centered at 75 mV appears with smaller current density than in the first cycle and shifts 50 mV to higher potentials. Interestingly, the second, third and fourth cycles are essentially identical and show no reactions at potentials over 2 V vs. Li/Li+. In Fig. 2a, the highest oxidation current is found at an Ep of 1.475 V for the 2nd 3rd and 4th cycles.


High rate and durable, binder free anode based on silicon loaded MoO3 nanoplatelets.

Martinez-Garcia A, Thapa AK, Dharmadasa R, Nguyen TQ, Jasinski J, Druffel TL, Sunkara MK - Sci Rep (2015)

a) Cyclic voltammogram (CV) for as-deposited MoO3 nanoplatelet arrays, (MoO3 loading: 0.9 mg) (0.5 mg cm−2); b) Cyclic voltammogram (CV) for Silicon-sprayed MoO3 (MoO3 loading: 1.1 mg, Si loading: 25 sprays ~15 μg Si, ~1.3 wt% Si ) (MoO3 0.625 mg cm−2, Si 8.5 μg cm−2).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4441197&req=5

f2: a) Cyclic voltammogram (CV) for as-deposited MoO3 nanoplatelet arrays, (MoO3 loading: 0.9 mg) (0.5 mg cm−2); b) Cyclic voltammogram (CV) for Silicon-sprayed MoO3 (MoO3 loading: 1.1 mg, Si loading: 25 sprays ~15 μg Si, ~1.3 wt% Si ) (MoO3 0.625 mg cm−2, Si 8.5 μg cm−2).
Mentions: For the electrochemical characterization, select set of anode samples were loaded with between 0.3 to 1.3 wt% of silicon on MoO3. Figure 2a and b show cyclic voltammograms obtained at a scan rate of 1 mV s−1 for as-synthesized MoO3 and Si@MoO3 respectively. In the pristine MoO3 anode (Fig. 2a), three cathodic waves are observed in the 3 V – 5 mV window for the first cathodic polarization sweep (discharging) at 2.65 V, 2.19 V and 75 mV. In the reverse scan (charging), the oxidation waves are seen around 0.5 V, 1.25 V and 1.5 V. Important evidence of irreversibility is observed in the subsequent cycles as the reduction waves over 2 V are not present anymore, and the cathodic peak centered at 75 mV appears with smaller current density than in the first cycle and shifts 50 mV to higher potentials. Interestingly, the second, third and fourth cycles are essentially identical and show no reactions at potentials over 2 V vs. Li/Li+. In Fig. 2a, the highest oxidation current is found at an Ep of 1.475 V for the 2nd 3rd and 4th cycles.

Bottom Line: Li2MoO4 and Li(1.333)Mo(0.666)O2 were identified as the products of lithiation of pristine MoO3 nanoplatelets and silicon-decorated MoO3, respectively, accounting for lower than previously reported lithiation potentials.MoO3 nanoplatelet arrays were deposited using hot-wire chemical vapor deposition.Silicon decorated MoO3 nanoplatelets exhibited enhanced capacity of 1037 mAh g(-1) with exceptional cyclability when charged/discharged at high current densities of 10 A g(-1).

View Article: PubMed Central - PubMed

Affiliation: 1] Department of Chemical Engineering University of Louisville Louisville, KY 40292. [2] Conn Center for Renewable Energy Research.

ABSTRACT
In order to make fast-charging batteries a reality for electric vehicles, durable, more energy dense and high-current density resistant anodes need to be developed. With such purpose, a low lithiation potential of 0.2 V vs. Li/Li(+) for MoO3 nanoplatelet arrays is reported here for anodes in a lithium ion battery. The composite material here presented affords elevated charge capacity while at the same time withstands rapid cycling for longer periods of time. Li2MoO4 and Li(1.333)Mo(0.666)O2 were identified as the products of lithiation of pristine MoO3 nanoplatelets and silicon-decorated MoO3, respectively, accounting for lower than previously reported lithiation potentials. MoO3 nanoplatelet arrays were deposited using hot-wire chemical vapor deposition. Due to excellent voltage compatibility, composite lithium ion battery anodes comprising molybdenum oxide nanoplatelets decorated with silicon nanoparticles (0.3% by wt.) were prepared using an ultrasonic spray. Silicon decorated MoO3 nanoplatelets exhibited enhanced capacity of 1037 mAh g(-1) with exceptional cyclability when charged/discharged at high current densities of 10 A g(-1).

No MeSH data available.


Related in: MedlinePlus