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Pyrite FeS2 for high-rate and long-life rechargeable sodium batteries

Journal Article


Abstract


  • It is desirable to develop electrode materials for advanced rechargeable batteries with low cost, long life, and high-rate capability. Pyrite FeS2, as an easily obtained natural mineral, has been already commercialized in primary lithium batteries, but encountered problems in rechargeable batteries with carbonate-based electrolytes due to the limited cycle life caused by the conversion-type reaction (FeS2 + 4M → Fe + 2M2S (M = Li or Na)). Herein, we demonstrate that FeS2 microspheres can be applied in room-temperature rechargeable sodium batteries with only the intercalation reaction by simultaneously selecting a compatible NaSO3CF3/diglyme electrolyte and tuning the cut-off voltage to 0.8 V. A surprisingly high-rate capability (170 mA h g-1 at 20 A g-1) and unprecedented long-term cyclability (∼90% capacity retention for 20 000 cycles) has been obtained. We suggest that a stable electrically conductive layer-structured NaxFeS2 was formed during cycling, which enables the highly reversible sodium intercalation and deintercalation. Moreover, 18650-type sodium batteries were constructed exhibiting a high capacity of ∼4200 mA h (corresponding to 126 W h kg-1 and 382 W h L-1) and a capacity retention of 97% after an initial 200 cycles at 4 A during charge-discharge. This shows that the production of rechargeable sodium batteries with FeS2 microspheres is viable for commercial utilization.

UOW Authors


  •   Hu, Zhe (external author)

Publication Date


  • 2015

Citation


  • Hu, Z., Zhu, Z., Cheng, F., Zhang, K., Wang, J., Chen, C., & Chen, J. (2015). Pyrite FeS2 for high-rate and long-life rechargeable sodium batteries. Energy and Environmental Science, 8(4), 1309-1316. doi:10.1039/c4ee03759f

Scopus Eid


  • 2-s2.0-84926500607

Start Page


  • 1309

End Page


  • 1316

Volume


  • 8

Issue


  • 4

Abstract


  • It is desirable to develop electrode materials for advanced rechargeable batteries with low cost, long life, and high-rate capability. Pyrite FeS2, as an easily obtained natural mineral, has been already commercialized in primary lithium batteries, but encountered problems in rechargeable batteries with carbonate-based electrolytes due to the limited cycle life caused by the conversion-type reaction (FeS2 + 4M → Fe + 2M2S (M = Li or Na)). Herein, we demonstrate that FeS2 microspheres can be applied in room-temperature rechargeable sodium batteries with only the intercalation reaction by simultaneously selecting a compatible NaSO3CF3/diglyme electrolyte and tuning the cut-off voltage to 0.8 V. A surprisingly high-rate capability (170 mA h g-1 at 20 A g-1) and unprecedented long-term cyclability (∼90% capacity retention for 20 000 cycles) has been obtained. We suggest that a stable electrically conductive layer-structured NaxFeS2 was formed during cycling, which enables the highly reversible sodium intercalation and deintercalation. Moreover, 18650-type sodium batteries were constructed exhibiting a high capacity of ∼4200 mA h (corresponding to 126 W h kg-1 and 382 W h L-1) and a capacity retention of 97% after an initial 200 cycles at 4 A during charge-discharge. This shows that the production of rechargeable sodium batteries with FeS2 microspheres is viable for commercial utilization.

UOW Authors


  •   Hu, Zhe (external author)

Publication Date


  • 2015

Citation


  • Hu, Z., Zhu, Z., Cheng, F., Zhang, K., Wang, J., Chen, C., & Chen, J. (2015). Pyrite FeS2 for high-rate and long-life rechargeable sodium batteries. Energy and Environmental Science, 8(4), 1309-1316. doi:10.1039/c4ee03759f

Scopus Eid


  • 2-s2.0-84926500607

Start Page


  • 1309

End Page


  • 1316

Volume


  • 8

Issue


  • 4