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Highly crystalline graphite nanofibers as an anode for high-performance potassium-ion batteries

Graphite is considered the most promising anode for low-cost potassium-ion batteries (PIBs). However, the large volume change and sluggish kinetics due to the large ionic size of K + cause inferior rate capability and poor cycling stability for the graphite anode. Herein, we report highly crystallin...

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Published in:New journal of chemistry 2024-04, Vol.48 (16), p.7497-752
Main Authors: Sun, Kaixuan, Chang, Kun, Tan, Jinshuo, Sun, Chuan-Fu, Liu, Qin
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Language:English
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creator Sun, Kaixuan
Chang, Kun
Tan, Jinshuo
Sun, Chuan-Fu
Liu, Qin
description Graphite is considered the most promising anode for low-cost potassium-ion batteries (PIBs). However, the large volume change and sluggish kinetics due to the large ionic size of K + cause inferior rate capability and poor cycling stability for the graphite anode. Herein, we report highly crystalline graphite nanofibers (GNFs) as an anode material for PIBs, which deliver flat voltage plateaus with a high specific capacity of 257 mA h g −1 . The highly graphitized, fiber-shaped nanostructure not only mitigates the volume expansion caused by K + -intercalation but also facilitates both ionic diffusion and electron transfer. GNFs achieve a long cycle life of 1 year with 99% capacity retention and fast K + -intercalation kinetics. Moreover, the low-defect structure of GNFs ensures a high initial coulombic efficiency of up to 74.23%. A potassium-ion full-cell prototype featuring GNFs anode and Prussian blue analogue cathode demonstrates a high energy efficiency of up to 90.6%. This low-defect graphitic nanofiber may offer insights into the design of carbon-based anodes for PIBs. Graphite nanofibres with high crystallinity and low defect levels for potassium-ion batteries with high initial Coulombic efficiency and long cycling stability are reported in this study.
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source Royal Society of Chemistry
subjects Anodes
Crystal defects
Design defects
Electrode materials
Electron transfer
Graphite
Graphitization
Intercalation
Ion diffusion
Kinetics
Nanofibers
Pigments
Potassium
Rechargeable batteries
title Highly crystalline graphite nanofibers as an anode for high-performance potassium-ion batteries
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