Cu-based Prussian blue cubic sheet with core-shell structure for high-rate sodium-ion batteries

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage Pub Date : 2025-03-01 DOI:10.1016/j.est.2025.116031

Haonan Cui , Jun Wu , Zibin Xu , Junming Xu , Yurong Cai , Wenbin Ni , Xiaochong Zhou

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Abstract

Suffering from their severe frame distortion, conventional Prussian blue analogues (PBAs) have still remained challenges in poor cyclability and short life-span for cathodes of sodium-ion batteries (SIBs). By employing a two-step co-precipitation coating strategy, a cubic sheet FeCu-HCF@Cu-HCF composite was in-situ synthesized in this paper with a core-shell structure of Na_xFe_1-yCu_y[Fe(CN)₆] (FeCu-HCF) as a core and Na_xCu[Fe(CN)₆] (Cu-HCF) as a shell layer. As an active cathode for SIBs, as-prepared FeCu-HCF@Cu-HCF composite showed an excellent cyclability retaining its initial capacity of 83.08 % after 300 cycles at 0.5C and high-rate capability of up 10C (1C = 140 mA·g⁻¹). Results analysis demonstrated that FeCu-HCF@Cu-HCF sample achieved an improved reaction kinetics with a higher Na⁺ diffusion coefficient and a lower coordinated water content than FeCu-HCF, indicating its better application prospect for high-performance of SIBs.

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来源期刊

Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment

CiteScore

11.80

自引率

24.50%

发文量

2262

审稿时长

69 days

期刊介绍： Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.