High-performance P2-type Na0.7Co0.1Fe0.1Mn0.8O2 cathode materials for sodium-ion batteries

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Journal of Solid State Electrochemistry Pub Date : 2024-09-07 DOI:10.1007/s10008-024-06055-6
De-xin Liu, Teng-yue Ma, Jin-ling An, Jin-rong Liu, Wei-yan He
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Abstract

Sodium-ion batteries are gaining broad application prospects in the field of new energy due to their high energy density, low cost, and good safety. However, the irreversible phase transformation of layered oxides during charge and discharge cycles limits their long-term cycling performance and practicality. This article utilizes the sol–gel method to prepare a stable Na0.7MnO2 (NMO) crystal phase and explores the effects of double doping with Fe and Co on the microstructure and electrochemical properties of Na0.7MnO2. The XRD pattern indicates that Fe and Co ions were successfully incorporated into the lattice of the Na-Mn–O system, stabilizing the P2 crystal phase and increasing the sodium layer spacing. Na0.7Co0.1Fe0.1Mn0.8O2(NCFMO) can deliver an initial capacity of 109.78 mAh/g, with an average operating voltage of 3 V, and retains a capacity retention rate of 96.31% after 100 cycles. Moreover, at a current density of 0.2 C and a voltage range of 1.5–4.5 V, the cycle charge–discharge specific capacity reaches 226.08 and 159.3 mAh/g, respectively, demonstrating excellent cycle and rate performance.

Graphical abstract

The cycle performance of the material Na0.7Co0.1Fe0.1Mn0.8O2 in different voltage ranges is tested in the figure, and it shows excellent performance in the voltage range of 1.5–4.5 V.

Abstract Image

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用于钠离子电池的高性能 P2- 型 Na0.7Co0.1Fe0.1Mn0.8O2 正极材料
钠离子电池由于能量密度高、成本低、安全性好,在新能源领域有着广阔的应用前景。然而,层状氧化物在充放电循环过程中的不可逆相变限制了其长期循环性能和实用性。本文利用溶胶-凝胶法制备了稳定的 Na0.7MnO2 (NMO) 晶相,并探讨了铁和钴的双重掺杂对 Na0.7MnO2 微观结构和电化学性能的影响。XRD 图谱表明,Fe 和 Co 离子成功地掺入了 Na-Mn-O 体系的晶格中,稳定了 P2 晶相并增加了钠层间距。在平均工作电压为 3 V 时,Na0.7Co0.1Fe0.1Mn0.8O2(NCFMO)的初始容量为 109.78 mAh/g,循环 100 次后的容量保持率为 96.31%。此外,在 0.2 C 的电流密度和 1.5-4.5 V 的电压范围内,循环充放电比容量分别达到 226.08 和 159.3 mAh/g,表现出优异的循环性能和速率性能。图文摘要图中测试了 Na0.7Co0.1Fe0.1Mn0.8O2 材料在不同电压范围内的循环性能,在 1.5-4.5 V 的电压范围内表现出优异的性能。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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