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Improving rate capability and cycling stability of P2-type sodium-ion layered cathode by synergistic effect of K/Ti co-doping strategy

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Abstract

As the sodium host, the P2-NaxMnO2 cathode suffers from multiple structural transformations caused by the Jahn-Teller distortion, incurring rapid voltage decay and capacity degradation of the sodium-ion batteries. Herein, K and Ti elements have been co-doped into the P2-NaxMnO2 to adjust the Na+/vacancy ordering and to reduce the Jahn-Teller distortion-caused structural transformations by lowering the Mn3+ concentration. The prepared P2-Na0.66K0.01Mn0.9Ti0.1O2 shows high structural stability and rate performance with capacity retention of 87.4% after 200 cycles at a current density of 200 mA g−1, which is 60% higher than that of Na0.67MnO2. Moreover, the P2-Na0.66K0.01Mn0.9Ti0.1O2 also exhibits a good rate performance of 95.4 mAh g−1 at the same current density (74 mAh g−1 for Na0.67MnO2). The ex-situ XRD analyses demonstrate that the remarkable electrochemical performance of Na0.66K0.01Mn0.9Ti0.1O2 cathode should benefit from the high structural stability during the charge and discharge process and the improved diffusion kinetics.

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Funding

This work was supported by the State Key Program of the National Nature Science of China (Grant No.61835014), the Major Program of the National Natural Science Foundation of China (Grant No.51890865), and the Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang of China (Grant No.20kfhk01).

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Author notes

  1. Shihong Guo and Huawei Han contributed equally to this work.

Authors and Affiliations

  1. Institute of Functional Crystals and Tianjin Key Laboratory of Functional Crystal Materials, Tianjin University of Technology, Tianjin, 300384, China

    Shihong Guo, Huawei Han, Shuai Guo, Ningyun Hong, Jiangtao Fan, Zhen Long & Shifu Xiong

  2. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Xiaoqing Qiu

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  1. Shihong Guo
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Contributions

Shihong Guo: conceptualization, investigation, writing – original draft. Huawei Han: conceptualization, investigation, writing – original draft. Yimeng Chen: investigation. Shuai Guo: validation. Ningyun Hong: resources. Jiangtao Fan: data curation. Xiubao Jiang: data curation. Zhen Long: visualization, project administration. Xiaoqing Qiu: validation, writing – review and editing. Mei Tang: project administration. Shifu Xiong: project administration.

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Correspondence to Zhen Long, Shifu Xiong or Xiaoqing Qiu.

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ESM 1

The Supproting Information is available free of charge at Physical parameters, SEM images, Powder XRD patterns of NMO, NMTO-0.10 and NKMTO-0.010 samples, Comparison table of electrochemical properties of different materials, Pseudocapacitive capacities of samples at 0.8 mV s-1 scan rate of NMO. Ratio of the pseudocapacitive and diffusion-controlled contribution at different scan rates of NMO. (DOCX 3470 kb)

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Guo, S., Han, H., Guo, S. et al. Improving rate capability and cycling stability of P2-type sodium-ion layered cathode by synergistic effect of K/Ti co-doping strategy. Ionics 29, 2735–2746 (2023). https://doi.org/10.1007/s11581-023-05032-9

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  • DOI: https://doi.org/10.1007/s11581-023-05032-9

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