P2/O3 biphasic Ni/Fe/Mn-based layered cathode with high capacity and great cyclability for sodium-ion batteries

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL

Ionics Pub Date : 2024-12-11 DOI:10.1007/s11581-024-05985-5

Ningshuang Zhang, Xiaoqi Fan, Yifan Tong, Mengya Wang, Hao Ding, Junfei Zhou, Xin Li, Dongni Zhao, Shiyou Li

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引用次数: 0

Abstract

The rapid capacity loss suffered by P2-type Ni/Fe/Mn-based layered cathode materials, which is caused by deleterious high-voltage phase transformations and the dissolution of active materials, greatly limits their application in large-scale sodium-ion battery installations. In this study, a novel P2/O3 biphasic Na_0.62Mg_0.05Ni_0.15Fe_0.2Li_0.05Mn_0.6O₂ (NM-NFLM) layered cathode is developed using a multi-element (Mg and Li) co-substitution strategy. The absence of significant voltage plateaus in the charge/discharge profiles of cells featuring the proposed cathode indicates that deleterious phase transformations and concomitant lattice mismatch in the high-voltage region are effectively suppressed because of the intergrown structure of the resulting cathode, which has also been demonstrated by ex-situ X-ray diffraction analyses. The optimized cathode also displays improved structural stability and enhanced Na⁺ diffusion kinetics owing to the incorporation of stabilizing dopant pillars. Hence, the assembled Na half-cell delivers a high initial capacity of 205.6 mAh g⁻¹ at 0.1 C and excellent rate capability (98.6 mAh g⁻¹ at 10 C). Moreover, the P2 phase of NM-NFLM is maintained throughout the charging and discharging processes, with only a small amount of the O3 phase undergoing reversible phase transitions of O3-P3-O3, which improves its structure stability significantly. This study presents a design and optimization strategy of high-performance Ni/Fe/Mn-based cathodes.

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.