Year: 2024
Type: article
Abstract: Nonaqueous aluminum‐ion batteries (AIBs) provide advantages, such as high energy density, enhanced safety, and reduced corrosion, making them ideal for advanced energy storage solutions. A key challenge faced by AIBs is the lack of suitable cathode materials for rapid Al‐ion insertion /extraction. Herein, K 2 Mn[Fe(CN) 6 ] 2H 2 O (KMHCF) is innovatively chosen as a model to investigate the aluminum storage performance of Prussian blue analogues in nonaqueous AIBs. As anticipated, the KMHCF allows for reversible aluminum storage and exhibits characteristic charge/discharge plateaus. Furthermore, carbon combined highly crystalline KMHCF (HC‐KMHCF@C) is synthesized through a chelator‐assisted preparation method in combination with an in situ carbon compositing technique. With reduced [Fe(CN) 6 ] 4 ⁻ defects, lower interstitial water content, and enhanced conductivity, HC‐KMHCF@C exhibits a high aluminum storage capacity (146.2 mAh g⁻¹ at 0.5 A g⁻¹) and satisfactory cycling performance (maintaining 86.4 mAh g⁻¹ after 800 cycles). The electrochemical reaction mechanism of HC‐KMHCF@C is investigated in detail. During the initial charge, K⁺ ions are extracted, shifting the structure from monoclinic to cubic. In subsequent cycles, reversible Al 3+ insertion and extraction cause the structure to alternate between monoclinic and cubic phases.
Source: Small Methods
Authors: Jiening Zheng, Ke Yi, Chengkang Chang
Institution: Shanghai Institute of Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4402047038