Ball‐Milling Strategy for Fast and Stable Potassium‐Ion Storage in Antimony‐<i>Carbon</i> Composite Anodes
Fengjun Ji, Tianqi Liu, Yanzhao Li, Deping Li, Lijie Ci
Abstract
Abstract Potassium‐ion batteries (PIBs) have been considered as promising alternatives to lithium‐ion batteries in large‐scale energy storage systems owing to the high earth abundance and low cost of potassium resources. However, the large radius of the K ion hinders the development of suitable electrode materials. Herein, with commercial antimony (Sb) and meso Carbon microbead (MCMB) powders as low‐cost raw materials, a facile ball‐milling strategy is developed for constructing high‐performance Sb−C composite electrodes. The as‐prepared Sb@MCMB‐3 electrode exhibits high reversible capacity (525.4 mAh g −1 at 100 mA g −1 ), superior rate capability (293.9 mAh g −1 at 5000 mA g −1 ) and stable cycling performance (497.5 mAh g −1 after 80 cycles at 100 mA g −1 and 300.1 mAh g −1 after 500 cycles at 1.0 A g −1 ). With consecutive CV measurements, the galvanostatic intermittent titration technique, and Randle‐Sevcik equation, the K‐ion diffusion kinetics are insightfully evaluated. Therefore, this work may broaden the pathways for the commercialization of PIBs.