4.7 Article

Enhancing lithium ion diffusion kinetic in hierarchical lithium titanate@erbium oxide from coating to doping via facile one-step co-precipitation

期刊

JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 584, 期 -, 页码 900-906

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.10.022

关键词

Hierarchical Li4Ti5O12@Er2O3 microspheres; Li+ ions diffusion kinetic; Oxygen vacancy; One-step co-precipitation; Lithium ion batteries

资金

  1. National Natural Science Foundation of China [21965034, U1903217, 21666037]
  2. Xinjiang Autonomous Region Major Projects [2017A02004]
  3. Resource Sharing Platform Construction Project of Xinjiang Province [PT1909]
  4. Nature Science Foundation of Xinjiang Province [2017D01C074]
  5. Young Scholar Science Foundation of Xinjiang Educational Institutions [XJEDU2016S030]
  6. Xinjiang Autonomous Region postgraduate scientific research and innovation projects [XJ2019G015]

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Hierarchical lithium titanate@erbium oxide (Li4Ti5O12@Er2O3) microspheres with well-defined structure were successfully synthesized by a one-step co-precipitation method. The material shows excess rate capacity due to the hierarchical microsphere structure, Er2O3 coating, and Er3+ doping. The diffusion pathways for Li+ ions are shortened by the hierarchical microsphere structure, while the Er2O3 coating reduces adverse interface reactions and Er3+ doping induces oxygen vacancies to enhance Li+ ion diffusion kinetics.
Hierarchical lithium titanate@erbium oxide (Li4Ti5O12@Er2O3) microspheres from coating to doping were successfully synthesised by a simple and scalable one-step co-precipitation method. Microscopic observations revealed that the Li4Ti5O12@Er2O3 microspheres present a well-defined hierarchical structure and that Li4Ti5O12 is coated by the Er2O3 layer. The X-ray photoelectron spectroscopy (XPS) results demonstrate that partial Ti4+ is reduced to Ti3+ and induces oxygen vacancy because partial Er3+ dope into octahedral 16d Li+/Ti4+ sites of Li4Ti5O12. Owing to the hierarchical microsphere structure, Er2O3 coating, and Er3+ doping, the material exhibits excess rate capacity (183.7 mAh g(-1) at 30C). The hierarchical micro sphere structure shortens the diffusion pathways for Li+ ions. The Er2O3 coating on the surface reduces the adverse interface reaction. Importantly, oxygen vacancy induced by Er3+ doping enhances Li+ ion diffusion kinetics and offers extra space to store Li+ ions, which endows this sample with excess rate capacity. (C) 2020 Elsevier Inc. All rights reserved.

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