Preparation and Electrochemical Performance of Cu/Al Co-Doped P2-Na0.72Fe0.3Mn0.7O2 Cathode Materials

HOU Zhiwei; REN Haipeng; SUN Zhien

doi:10.16516/j.ceec.2026-117

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Preparation and Electrochemical Performance of Cu/Al Co-Doped P2-Na_0.72Fe_0.3Mn_0.7O₂ Cathode Materials

更新时间：2026-10-14

- Preparation and Electrochemical Performance of Cu/Al Co-Doped P2-Na_0.72Fe_0.3Mn_0.7O₂ Cathode Materials
- Southern Energy Construction Vol. 13, Issue 4, Pages: 45-51(2026)
- 作者机构：
  
  天津国安盟固利新材料科技股份有限公司,天津,301811
- 作者简介：
- 基金信息：
- DOI：10.16516/j.ceec.2026-117
  CLC： TM911.3;TQ152
- Published：2026
- 稿件说明：
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侯智伟, 任海朋, 孙志恩. Cu/Al共掺杂P2-Na_0.72Fe_0.3Mn_0.7O₂正极材料的制备及其电化学性能[J]. 南方能源建设, 2026, 13(4): 45-51. DOI: 10.16516/j.ceec.2026-117.

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侯智伟, 任海朋, 孙志恩. Cu/Al共掺杂P2-Na_0.72Fe_0.3Mn_0.7O₂正极材料的制备及其电化学性能[J]. 南方能源建设, 2026, 13(4): 45-51. DOI: 10.16516/j.ceec.2026-117. DOI：

. DOI： 10.16516/j.ceec.2026-117.

摘要

目的

为解决P2型Na

0.72

0.3

0.7

正极材料在充放电过程中易发生Jahn-Teller畸变、晶体结构不稳定、Na

传输速率慢及电子导电性差等问题。

方法

采用高温固相法制备了Cu/Al共掺杂P2型Na

0.72

0.15

0.65

0.05

正极材料。通过X射线衍射（XRD）、扫描电子显微镜（SEM）对材料的晶体结构及微观形貌进行表征，并结合恒流充放电和电化学阻抗谱（EIS）等测试系统研究其电化学性能。

结果

结果表明，Cu/Al双掺杂未改变材料的P2型层状结构，且能有效促进颗粒生长、改善颗粒分散性；Al

的引入可取代部分Mn

，抑制Jahn-Teller畸变，强化Al-O共价键以稳定层状骨架，同时扩大Na

扩散通道；Cu

的掺杂能优化过渡金属层价态平衡，抑制P2→O2等不可逆相变，提升材料本征电子导电性。电化学测试显示，在2.00～4.25 V电压区间，0.1C下，掺杂样品首次放电比容量可达133.8 mA·h/g，循环50圈后容量保持率为93.01%，显著高于未掺杂样品（78.75%）；在10C高倍率下，双掺杂样品放电比容量仍能达到55.2 mA·h/g，表现出优异的倍率性能。此外，双掺杂样品的电荷转移阻抗显著降低，Na

迁移速率提升至2.56×10

−9

/s，极化现象明显缓解。

结论

研究证实，Cu与Al的协同掺杂可实现结构稳定性与电化学动力学性能的同步提升，为高性能钠离子电池层状氧化物正极材料的设计与改性提供了可行思路。

Abstract

Objective

To solve the problems of P2-type Na

0.72

0.3

0.7

cathode materials

such as easy occurrence of Jahn-Teller distortion

unstable crystal structure

slow Na

transport rate and poor electronic conductivity during charge-discharge processes

Cu/Al co-doped P2-type Na

0.72

0.15

0.65

0.05

cathode materials were prepared by a high-temperature solid-state method.

Method

The crystal structure and micromorphology of the materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Meanwhile

the electrochemical properties were systematically studied by combining galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) tests.

Result

The results indicate that Cu/Al co-doping does not alter the P2-type layered structure of the material

but also effectively promote particle growth and improves the particle dispersion. The introduction of Al

can substitute for part of Mn

thereby suppressing Jahn-Teller distortion

strengthening the Al-O covalent bond to stabilize the layered framework

and expanding the Na

diffusion channels at the same time. Cu

doping can optimize the valence balance of the transition metal layer

inhibit irreversible phase transitions such as P2→O2

and enhance the intrinsic electronic conductivity of the material. Electrochemical test results show that in the voltage range of 2.0～4.25 V at 0.1

rate

the co-doped sample achieves an initial discharge specific capacity of 133.8 mAh/g

with a capacity retention rate of 93.01% after 50 cycles

which is significantly higher than that of the undoped sample (78.75%). The co-doped sample still maintains a discharge specific capacity of 55.2 mAh/g at a high rate of 10

showing excellent rate performance. In addition

the charge

-transfer impedance of the co-doped sample is significantly reduced

the Na

diffusion coefficient is increased to 2.56×10

−9

and the polarization phenomenon is obviously mitigated.

Conclusion

This study confirms that Cu/Al co-doping can synchronously improve the structural stability and electrochemical kinetics

providing a feasible approach for the design and modification of high-performance layered oxide cathode materials for sodium-ion batteries.

关键词

Keywords

references

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