Details

Autor(en) / Beteiligte

• Hu, Jun
• Wang, Bo
• Yu, Qiyao
• Zhang, Di
• Zhang, Yanghuan
• Li, Ying
• Wang, Wei (Alex)

Titel

CoSe2/N-doped carbon porous nanoframe as an anode material for potassium-ion storage

Ist Teil von

• Nanotechnology, 2020-09, Vol.31 (39), p.395403-395403

Ort / Verlag

England: IOP Publishing

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Transition metal selenides (TMS), on account of their relatively high theoretical capacity, unique electrical properties, easy compositing and low cost, are considered to be a candidate anode material for potassium-ion batteries. However, the cycling stability of TMS is unsatisfactory owing to the large intercalation/deintercalation of K ions. Herein, a CoSe2/N-doped carbon porous frame (CoSe2@NC) is successfully synthesized through a simple mixing and sintering approach and displays excellent potassium storage performance. Plentiful C-N bonds in the precursor can induce the formation of homogeneous N-doped carbon matrix and C-N-Co bonds, thus endowing robust structure and high electronic conductivity for superior cycling stability. Therefore, the unique porous nanoframe suppresses volume expansion and provides more diffusion paths for K ions. After 1000 cycles at 50 mA g−1, a high capacity of 311.3 mA h g−1 is acquired. When the current density increases to 500 mA g−1, the CoSe2@NC can still maintain a capacity of 184.5 mA h g−1 after 1000 cycles. The high performance, easy compositing and low cost of the CoSe2@NC make it a favorable material for application in KIBs.