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Hollow and hierarchical Na2Li2Ti6O14 microspheres with high electrochemical performance as anode material for lithium-ion battery

具有中空分级结构的Na2Li2Ti6O14微球作为高性能锂离子电池负极材料

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Abstract

Relying on a solvent thermal method, spherical Na2Li2Ti6O14 was synthesized. All samples prepared by this method are hollow and hierarchical structures with the size of about 2–3 μm, which are assembled by many primary nanoparticles (~300 nm). Particle morphology analysis shows that with the increase of temperature, the porosity increases and the hollow structure becomes more obvious. Na2Li2Ti6O14 obtained at 800°C exhibits the best electrochemical performance among all samples. Charge-discharge results show that Na2Li2Ti6O14 prepared at 800°C can delivers a reversible capacity of 220.1, 181.7, 161.6, 144.2, 118.1 and 97.2 mA h g−1 at 50, 140, 280, 560, 1400, 2800 mA g−1. However, Na2Li2Ti6O14-bulk only delivers a reversible capacity of 187, 125.3, 108.3, 88.7, 69.2 and 54.8 mA h g−1 at the same current densities. The high electrochemical performances of the as-prepared materials can be attributed to the distinctive hollow and hierarchical spheres, which could effectively reduce the diffusion distance of Li ions, increase the contact area between electrodes and electrolyte, and buffer the volume changes during Li ion intercalation/deintercalation processes.

摘要

本文采用溶剂热法合成了球形Na2Li2Ti6O14材料. 所有溶剂热法制备得到的材料均具有中空的分级结构, 并且均由粒径约为300 nm的 初级粒子通过组装形成, 微球的直径大约为2−3 μm. 粒子的形貌分析表明, 随着合成温度的增加, 孔隙率逐渐增加且中空结构更加明显. 在 所有材料中, 800°C合成的Na2Li2Ti6O14具有最好的电化学性能. 充放电测试表明, 在电流密度为50、140、280、560、1400、2800 mA g−1时, 800°C合成的Na2Li2Ti6O14样品的可逆容量分别为220.1、181.7、161.6、144.2、118.1、97.2 mA h g−1. 但是在相同电流密度条件下, 块状的 Na2Li2Ti6O14的可逆容量分别为187、125.3、108.3、88.7、69.2、54.8 mA h g−1. 中空分级结构微球可以有效地减小锂离子的扩散距离、增 加电极与电解液的接触面积、以及缓冲锂离子嵌脱过程中的体积变化, 从而使其具有较高的电化学性能.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21301052 and 51404002), Natural Science Foundation of Heilongjiang Province (E2016056), Specialized Research Fund for the Doctoral Program of Higher Education (20132301120001), Postdoctoral Science-Research Developmental Foundation of Heilongjiang Province (LBH-Q13138), and Applied Technology Research and Development Program of Harbin (2015RAQXJ032).

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Authors and Affiliations

  1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, China

    Shan-Shan Fan  (范姗姗), Hua Zhong  (仲华), Hai-Tao Yu  (于海涛), Ming Lou  (娄明) & Ying Xie  (谢颖)

  2. School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, 243002, China

    Yan-Rong Zhu  (朱彦荣)

Authors
  1. Shan-Shan Fan  (范姗姗)
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  2. Hua Zhong  (仲华)
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  3. Hai-Tao Yu  (于海涛)
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  4. Ming Lou  (娄明)
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  5. Ying Xie  (谢颖)
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  6. Yan-Rong Zhu  (朱彦荣)
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Corresponding authors

Correspondence to Ying Xie  (谢颖) or Yan-Rong Zhu  (朱彦荣).

Additional information

Shan-Shan Fan received her BSc degree in applied chemistry from Luoyang Normal University in 2015. She entered Heilongjiang University to pursue her master’s degree in science in 2015. She is interested in the application of quantum chemistry and the synthesis and electrochemical performance of anode materials for lithium ion battery applications.

Ying Xie received his BE degree in fine chemical engineering from Harbin University of Science and Technology in 2002. He then obtained MSc degree in chemical engineering in 2004 and PhD degree in chemical engineering and technology from Harbin Institute of Technology in 2008. He joined Heilongjiang University in 2008, and then became a member of the Key Laboratory of Functional InorganicMaterial Chemistry. He is currently a professor of Heilongjiang University. His research interests include theoretical predictions on the structures and properties of inorganic compounds and the synthesis of electrode materials and their applications in lithium-ion battery.

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Hollow and hierarchical Na2Li2Ti6O14 micro spheres with high electrochemical performance as anode material for lithium-ion battery

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Fan, SS., Zhong, H., Yu, HT. et al. Hollow and hierarchical Na2Li2Ti6O14 microspheres with high electrochemical performance as anode material for lithium-ion battery. Sci. China Mater. 60, 427–437 (2017). https://doi.org/10.1007/s40843-017-9033-5

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