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Optimizing Kinetics for Enhanced Potassium‐Ion Storage in Carbon‐Based Anodes.

Optimizing Kinetics for Enhanced Potassium‐Ion Storage in Carbon‐Based Anodes.

Authors :
Yang, Keke
Zhou, Wang
Fu, Qingfeng
Xiao, Lili
Mo, Ying
Ke, Jinlong
Shen, Wenzhuo
Wang, Zhiyong
Tu, Jian
Chen, Shi
Gao, Peng
Liu, Jilei
Source :
Advanced Functional Materials. 10/25/2023, Vol. 33 Issue 44, p1-9. 9p.
Publication Year :
2023

Abstract

The sluggish kinetics in traditional graphite anode greatly limits its fast‐charging capability, which is critically important for commercialization of potassium ion batteries (PIBs). Hard carbon possesses randomly oriented pseudo‐graphitic crystallites, enabling homogeneous reaction current and superior rate performance. Herein, a series of hybrid anodes with different hard carbon/graphite ratios are prepared by uniformly mixing graphite and hard carbon with ball‐milling. Comprehensive experimental results in combination phase‐field simulations reveal that the hybrid anode possesses a homogeneous reaction current and an intriguing potential difference between K+‐adsorbed hard carbon and non‐potassiated graphite. The homogeneous reaction current in the hybrid anode promotes sufficient utilization of electrode material, leading to an increase in the reversible capacity. The present potential difference between K+‐adsorbed hard carbon and non‐potassiated graphite provides an additional electric field force that facilitates the diffusion of K+ from hard carbon into the nearest neighbor graphite. All these together, emphasize the synergistic effects between hard carbon and graphite in hybrid anodes toward satisfactory rate and cycling performance. The hybrid strategy proposed here is compatible with the commercial battery manufacturing, offering a practical pathway for the development of high‐performance PIBs. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1616301X
Volume :
33
Issue :
44
Database :
Academic Search Index
Journal :
Advanced Functional Materials
Publication Type :
Academic Journal
Accession number :
173231193
Full Text :
https://doi.org/10.1002/adfm.202306190