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Porous perovskite LaNiO3 nanocubes as cathode catalysts for Li-O2 batteries with low charge potential.

Zhang J, Zhao Y, Zhao X, Liu Z, Chen W - Sci Rep (2014)

Bottom Line: The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V).Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery.Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.

ABSTRACT
Developing efficient catalyst for oxygen evolution reaction (OER) is essential for rechargeable Li-O2 battery. In our present work, porous LaNiO3 nanocubes were employed as electrocatalyst in Li-O2 battery cell. The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V). The synergistic effect of porous structure, large specific surface area and high electrocatalytic activity of porous LaNiO3 nanocubes ensured the Li-O2 battery with enchanced capacity and good cycle stability. Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery. Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

No MeSH data available.


Related in: MedlinePlus

(a) Discharge capacity with cycle numbers under full capacity discharge-charge test at the current density of 0.08 mA cm−2; b) XRD pattern of the lithium anode after 3 discharge-charge cycles.
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f4: (a) Discharge capacity with cycle numbers under full capacity discharge-charge test at the current density of 0.08 mA cm−2; b) XRD pattern of the lithium anode after 3 discharge-charge cycles.

Mentions: Although porous LaNiO3 nanocubes showed good ORR and OER performance, it was found that the Li-O2 battery cell suffered serious capacity fading during the full capacity discharge-charge tests. As can be seen in Fig. 4a, only 50% capacity was retained after 3 discharge-charge cycles. The serious capacity decay was usually ascribed to the electrode passivation, caused by partial blocking of active sites and pores by undecomposed Li2O2 and side products Li2CO3 during the discharge-charge cycles37434445. Interestingly, we also observed serious degradation at the Li anode. After 3 discharge-charge cycles the surface of the Li anode changed from metallic chip to white powders (Fig. S4), which was evidenced to be LiOH by the XRD measurement (Fig. 4b). The formation of LiOH coated on the anode can affect the cycle performance of the battery cell.


Porous perovskite LaNiO3 nanocubes as cathode catalysts for Li-O2 batteries with low charge potential.

Zhang J, Zhao Y, Zhao X, Liu Z, Chen W - Sci Rep (2014)

(a) Discharge capacity with cycle numbers under full capacity discharge-charge test at the current density of 0.08 mA cm−2; b) XRD pattern of the lithium anode after 3 discharge-charge cycles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4125986&req=5

f4: (a) Discharge capacity with cycle numbers under full capacity discharge-charge test at the current density of 0.08 mA cm−2; b) XRD pattern of the lithium anode after 3 discharge-charge cycles.
Mentions: Although porous LaNiO3 nanocubes showed good ORR and OER performance, it was found that the Li-O2 battery cell suffered serious capacity fading during the full capacity discharge-charge tests. As can be seen in Fig. 4a, only 50% capacity was retained after 3 discharge-charge cycles. The serious capacity decay was usually ascribed to the electrode passivation, caused by partial blocking of active sites and pores by undecomposed Li2O2 and side products Li2CO3 during the discharge-charge cycles37434445. Interestingly, we also observed serious degradation at the Li anode. After 3 discharge-charge cycles the surface of the Li anode changed from metallic chip to white powders (Fig. S4), which was evidenced to be LiOH by the XRD measurement (Fig. 4b). The formation of LiOH coated on the anode can affect the cycle performance of the battery cell.

Bottom Line: The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V).Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery.Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.

ABSTRACT
Developing efficient catalyst for oxygen evolution reaction (OER) is essential for rechargeable Li-O2 battery. In our present work, porous LaNiO3 nanocubes were employed as electrocatalyst in Li-O2 battery cell. The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V). The synergistic effect of porous structure, large specific surface area and high electrocatalytic activity of porous LaNiO3 nanocubes ensured the Li-O2 battery with enchanced capacity and good cycle stability. Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery. Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

No MeSH data available.


Related in: MedlinePlus