Citation: Chang Liu, Yujie Li, Yanhong Feng, Sen Zhang, Di Lu, Boyun Huang, Tao Peng, Weiwei Sun. Engineering of yolk-shelled FeSe₂@nitrogen-doped carbon as advanced cathode for potassium-ion batteries[J]. Chinese Chemical Letters, ;2021, 32(11): 3601-3606. doi: 10.1016/j.cclet.2021.04.002 shu

Engineering of yolk-shelled FeSe₂@nitrogen-doped carbon as advanced cathode for potassium-ion batteries

Chang Liu ^{a, b, 1} ,
Yujie Li ^{a, 1} ,
Yanhong Feng ^b ,
Sen Zhang ^b ,
Di Lu ^a ,
Boyun Huang ^a ,
Tao Peng ^c ,
Weiwei Sun ^{a, *,}

a.
College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
b.
School of Physics and Electronics, Hunan University, Changsha 410082, China
c.
School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China

wwsun@whu.edu.cn

Received Date: 13 March 2021
Revised Date: 30 March 2021
Accepted Date: 1 April 2021
Available Online: 3 April 2021

Figures(4)

Potassium-ion batteries (KIBs) have become the most promising alternative to lithium-ion batteries for large-scale energy storage system due to their abundance and low cost. However, previous reports focused on the intercalation-type cathode materials usually showed an inferior capacity, together with a poor cyclic life caused by the repetitive intercalation of large-size K-ions, which hinders their practical application. Here, we combine the strategies of carbon coating, template etching and hydrothermal selenization to prepare yolk-shelled FeSe₂@N-doped carbon nanoboxes (FeSe₂@C NBs), where the inner highly-crystalline FeSe₂ clusters are completely surrounded by the self-supported carbon shell. The integrated and highly conductive carbon shell not only provides a fast electron/ion diffusion channel, but also prevents the agglomeration of FeSe₂ clusters. When evaluated as a conversion-type cathode material for KIBs, the FeSe₂@C NBs electrode delivers a relatively high specific capacity of 257 mAh/g at 100 mA/g and potential platform of about 1.6 V, which endow a high energy density of about 411 Wh/kg. Most importantly, by designing a robust host with large internal void space to accommodate the volumetric variation of the inner FeSe₂ clusters, the battery based on FeSe₂@C NBs exhibits ultra-long cycle stability. Specifically, even after 700 cycles at 100 mA/g, a capacity of 221 mAh/g along with an average fading rate of only 0.02% can be retained, which achieves the optimal balance of high specific capacity and long-cycle stability.
- Potassium battery,
- Yolk-shell structure,
- FeSe₂,
- Conversion-type cathode,
- High energy density
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Engineering of yolk-shelled FeSe₂@nitrogen-doped carbon as advanced cathode for potassium-ion batteries