Surface Engineering through In Situ Construction of CoxB‐Spinel Dual Coating Layers for High‐Voltage Stable Sodium‐Ion Batteries

尖晶石 材料科学 阴极 溶解 涂层 无定形固体 过渡金属 化学工程 图层(电子) 保形涂层 离子 电化学 容量损失 纳米技术 电极 结晶学 冶金 物理化学 催化作用 化学 生物化学 工程类 有机化学
作者
Sheng Feng,Yan Lü,Xianlong Lu,Huan Chen,Xiangwei Wu,Meifen Wu,Fangfang Xu,Zhaoyin Wen
出处
期刊:Advanced Energy Materials [Wiley]
卷期号:14 (12) 被引量:5
标识
DOI:10.1002/aenm.202303773
摘要

Abstract Transition metal layered oxides (Na x TMO 2 ), boasting a high theoretical specific capacity and affordability, have emerged as prominent cathodes for sodium‐ion batteries (SIBs). Their potential, however, is hindered when operating at higher voltage range (4.0–4.3 V) due to irreversible phase transition, heterogeneous surface reconstruction, and side reaction. Herein, using a straightforward room‐temperature liquid‐phase reductive method, a dual conformal protective layer is in situ constructed on the surface of NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM). This layer comprises both a spinel structure and an amorphous Co x B coating, thereby achieving a layered‐spinel‐Co x B configuration. The spinel structure provides 3D Na + transport channels and works as a pillar to anchor the intrinsic layered structure. Simultaneously, the external Co x B layer effectively mitigates O loss, transition metal ion dissolution, and undesired side reactions on the surface. Benefiting from the synergistic effects on both the material's bulk and surface, the 1wt% Co x B coated cathode displays superior stability. After 300 cycles, the capacity retention is 79.6% between 2 and 4 V, significantly outperforming pristine‐NFM's(p‐NFM) 51.4%. When charged to 4.3 V, its capacity retention stands at 70%, much higher than that of p‐NFM (51.2%). This work provides new insights into exploiting high‐voltage stable cathode through constructing a dual conformal protective layer for high energy density SIBs.
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