Homologous Strategy to Construct High-Performance Coupling Electrodes for Advanced Potassium-Ion Hybrid Capacitors
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ARTICLE
Cite as Nano-Micro Lett. (2021) 13:14 Received: 14 June 2020 Accepted: 21 August 2020 © The Author(s) 2020
https://doi.org/10.1007/s40820-020-00524-z
Homologous Strategy to Construct High‑Performance Coupling Electrodes for Advanced Potassium‑Ion Hybrid Capacitors Ying Xu1, Jiafeng Ruan1, Yuepeng Pang1, Hao Sun1, Chu Liang2 *, Haiwen Li3, Junhe Yang1 *, Shiyou Zheng1 *
HIGHLIGHTS • A novel and facile homologous strategy is proposed to construct unique multichannel carbon fiber (MCCF)-based electrode materials for potassium-ion hybrid capacitors. • The S-MCCF anodes present high capacity, super rate capability, and long cycle stability in potassium-ion half-cells, and the aMCCF cathodes have a high specific surface area of 1445 m2 g−1 and exhibit outstanding capacitive performance. • The fabricated PIHC (manode:mcathode = 1:2) devices show high energy and power densities together with excellent cycling stability.
500
ered as promising potentials in mid- to
400
S-MCCF//aMCCF PIHC
large-scale storage system applications density. However, the process involving the intercalation of K+ into the carbonaceous anode is a sluggish reaction, while the adsorption of anions onto the cathode surface is relatively faster, resulting in an
S-MCCF anode
300
PF
PIHC, it is critical to promote the K+ insertion/desertion in anodic materials
−
6
K+
200
This work
100
e−
10
1
SIHC Ref. 62 Ref. 60 Ref. 59 Ref. 61
PIHC Ref. 23 Ref. 63 Ref. 9 Ref. 7
100 1000 10000 Power density (W kg−1)
100
inability to exploit the advantage of high energy. To achieve a high-performance
aMCCF cathode Charge
owing to their high energy and power
Capacity retention (%)
capacitors (PIHCs) have been consid-
Energy density (Wh kg−1)
ABSTRACT Potassium-ion hybrid
Current density: 1000 mA g−1
0
0
1000
2000
3000 4000 Cycle number
5000
6000
7000
and design suitable cathodic materials matching the anodes. In this study, we propose a facile “homologous strategy” to construct suitable anode and cathode for high-performance PIHCs, that is, unique multichannel carbon fiber (MCCF)-based anode and cathode materials are firstly prepared by electrospinning, and then followed by sulfur doping and KOH activation treatment, respectively. Owing to a multichannel structure with a large interlayer spacing for introducing S in the sulfur-doped multichannel carbon fiber (S-MCCF) composite, it presents high capacity, super rate capability, and long cycle stability as an anode in potassium-ion cells. The cathode composite of activated
multichannel carbon fiber (aMCCF) has a considerably high specific surface area of 1445 m2 g−1 and exhibits outstanding capacitive
* 1 2 3
Chu Liang, [email protected]; Junhe Yang, [email protected]; Shiyou Zheng, [email protected] School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People’s Republic of China College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China In
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