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PPy-Encapsulated Na2Li2Ti6O14 Composites as High-Performance Anodes for Li-Ion Battery

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Na2Li2Ti6O14 as a reliable anode material is becoming a hopeful candidate for Li-ion battery. Nevertheless, the pristine Na2Li2Ti6O14 usually suffer from bad rate performance and poor cycling stability under high current due to limited diffusion kinetics and poor electrical conductivity. Here, the PPy-coated Na2Li2Ti6O14 composites are successfully obtained via the solid-state method and followed by chemical oxidation process in the first time. The results of tests prove that the Na2Li2Ti6O14@PPy composites have better electrochemical performance than the bare Na2Li2Ti6O14 because of the excellent electrical conductivity and the special macromolecular architecture of PPy. In particular, the Na2Li2Ti6O14@PPy (4 wt%) exhibits excellent charge capacities of about 223.2, 218.0, 200.8, 184.3 and 172.6 mAh g−1 at 50, 100, 200, 300 and 500 mA g−1, respectively, revealing the best rate capability of all electrode materials. The Na2Li2Ti6O14@PPy(4 wt%) not only has the highest charge capacity under 0.5 mA g−1, but also has the highest capacity retention of 85.12% among all samples after 100 loops. Hence, the PPy coating is known as a promising way to improve the electrochemical property of Na2Li2Ti6O14. The PPy-coated Na2Li2Ti6O14 demonstrates the great prospect as promising negative materials for Li-ion batteries.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. U1960107), the ‘‘333” Talent Project of Hebei Province (No. A202005018) and the Fundamental Research Funds for the Central Universities (No. N2123001).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Fan-Fan Wang, Nan Zhang, Ze-Chen Lv, Yan-Rong Zhu & Ting-Feng Yi

  2. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, China

    Jun-Hong Zhang

  3. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China

    Fan-Fan Wang, Nan Zhang, Ze-Chen Lv, Yan-Rong Zhu & Ting-Feng Yi

  4. Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004, China

    Ting-Feng Yi

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  1. Fan-Fan Wang
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Wang, FF., Zhang, N., Lv, ZC. et al. PPy-Encapsulated Na2Li2Ti6O14 Composites as High-Performance Anodes for Li-Ion Battery. Acta Metall. Sin. (Engl. Lett.) 35, 1873–1881 (2022). https://doi.org/10.1007/s40195-022-01418-2

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