Cation W-doping motivated novel layered K0.45Rb0.05Mn0.85−xWxMg0.15O2 cathode for boosting potassium/sodium-ion storage

IF 13.2 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-01-01 DOI:10.1016/j.cej.2024.158632

Yucong Chen , Xiaobo Chen , Jia Li , Hongjie Chen , Yixuan Su , Weitao Chen , Chengrun Yu , Francis Chi-Chun Ling , Qiang Ru

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引用次数: 0

Abstract

Novel layered K_0.45Rb_0.05Mn_0.85−xMg_0.15W_xO₂ cathode materials modified with different ratios of W-doping are fabricated for potassium (PIBs) and sodium ion batteries (SIBs) by a facile solid-phase sintering strategy. W-doping can dramatically amplify the lattice spacing, achieve narrow-sized primary particle and mitigate the lattice oxygen release from the surface of the material. Meanwhile, by comparing the SEM and XRD before and after cycling, the W-doping modification can effectively stabilize the lattice structure and inhibit the crack formation on the surface of the material. Further, W-doping alleviates the electrochemical polarization and lowers the diffusion barrier of potassium/sodium ions. Thus, benefiting from the reinforced structural stability, rapid ion mobility and conspicuous pseudocapacitance contribution, the K_0.45Rb_0.05Mn_0.84Mg_0.15W_0.01O₂ cathode harvests favourable potassium/sodium storage capability of 110.6 mAh/g at 20 mA g⁻¹ in PIBs and 109.9 mAh/g at 100 mA g⁻¹ in SIBs. Meanwhile, the favorable chemical performance can be also supported by the KRMMO-W1//Hard carbon K-/Na-ion full batteries, which increases the feasibility of practical applications.

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阳离子w掺杂激发了新型层状K0.45Rb0.05Mn0.85−xWxMg0.15O2阴极，用于提高钾/钠离子的存储

采用简单固相烧结的方法制备了不同w掺杂比例的K0.45Rb0.05Mn0.85−xMg0.15WxO2层状正极材料，用于钾离子电池和钠离子电池。w掺杂可以显著地扩大晶格间距，实现窄尺寸的初级颗粒，并减轻材料表面晶格氧的释放。同时，通过对比循环前后的SEM和XRD， w掺杂改性可以有效地稳定材料表面的晶格结构，抑制材料表面裂纹的形成。此外，w掺杂可以缓解电化学极化，降低钾/钠离子的扩散势垒。因此，受益于增强的结构稳定性、快速的离子迁移率和显著的赝电容贡献，k0.45 rb0.05 mn0.84 mg0.15 w0.010 o2阴极在pib中获得了良好的钾/钠存储能力，在20 mA g−1时为110.6 mAh/g，在sib中为100 mA g−1时为109.9 mAh/g。同时，KRMMO-W1//Hard carbon K-/Na-ion full batteries也能支持其良好的化学性能，增加了实际应用的可行性。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.