Surface-segregated, high-voltage spinel lithium-ion battery cathode material LiNi0.5Mn1.5O4cathodes by aluminium doping with improved high-rate cyclability

Ying Luo, Taolin Lu, Yixiao Zhang, Liqin Yan, Samuel S. Mao, Jingying Xie

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

A series of Al-doped Li1+xNi0.5AlxMn1.5-xO4cathode materials for lithium ion batteries are successfully synthesized via a co-precipitation method. Raman spectroscopy studies reveal that the cation-disordered tends to increase with the content of Al. The data of X-ray photoelectron spectroscopy (XPS) depth profiles reveal that the inert Al3+ions segregates preferentially to the surface during the synthesis process. The results of the electrochemical tests suggest that the substitution of a small amount of Al has the ability to improve the rate capability of LiNi0.5Mn1.5O4spinel with conventional electrolytes. Especially, the Al-doped (x = 0.06) sample delivers a long cycle-life at high rate (20 C). The enhanced performance is attributed to the formation of Al-enriched surface, providing a more stable interface with the electrolyte at high voltage (∼4.7 V), along with the stabilization of the spinel structure with a disordering of the cations and improved Li-ion diffusion, based on results of the potentiostatic intermittent titration technique.

Original languageBritish English
Pages (from-to)289-297
Number of pages9
JournalJournal of Alloys and Compounds
Volume703
DOIs
StatePublished - 2017

Keywords

  • High-rate cyclability
  • LiNiMnOcathodes
  • Lithium ion battery
  • Surface segregation

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