Enhanced Performance of Ternary NASICON-Type Na3.5−xMn0.5V1.5−xZrx (PO4)3/C Cathodes for Sodium-Ion Batteries

IF 10.8 2区化学 Q1 CHEMISTRY, PHYSICAL 物理化学学报 Pub Date : 2024-12-01 DOI:10.3866/PKU.WHXB202407023

Jianbao Mei , Bei Li , Shu Zhang , Dongdong Xiao , Pu Hu , Geng Zhang

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Abstract

Sodium-ion batteries (SIBs) are widely studied for energy storage applications, but achieving cathode materials with balanced high energy density, stability, and fast charge/discharge performance remains a key challenge. In this study, we successfully synthesized a series of NASICON-type Na_3.5−xMn_0.5V_1.5−xZr_x(PO₄)₃/C, incorporating Mn, V, and Zr to investigate their impact on electrochemical performance. By introducing Zr alongside Mn and V, we developed a novel strategy to activate V⁴⁺/V⁵⁺ redox reactions, achieving high energy density. Moreover, this substitution promotes Na-ion migration by widening the migration pathways and generating additional Na vacancies, which greatly enhances electrode reaction kinetics and boosts overall performance. Na_3.4Mn_0.5V_1.4Zr_0.1(PO₄)₃/C demonstrates superior stability, retaining 90% of its capacity after 800 cycles, and delivers high-rate performance (84 mAh∙g⁻¹ at 20C), significantly outperforming pristine Na_3.5Mn_0.5V_1.5(PO₄)₃/C. These advancements highlight a potential approach for developing efficient and sustainable SIBs.

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