Improved electrochemical performance of LiMn 1.5Ni 0.5O 4 electrode modified by AlPO 4 for lithium-ion batteries

Cheol Woo Yi, Jin Yi Shi, Keon Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

LiMn 1.5Ni 0.5O 4 materials modified by AlPO 4 are prepared by a sol-gel method with citric acid to improve their electrochemical performance. The physical and electrochemical properties of the samples are characterized by various analytical techniques. The coated AlPO 4 layer completely covers the surfaces of the LiMn 1.5Ni 0.5O 4 particles and the thickness of the coated layer is ∼15 nm. Moreover, the surface and charge-transfer resistances of the modified electrode are much lower than those of the pristine sample, and the lithium diffusion rate of the modified electrode was also significantly enhanced. As a result, the modified materials demonstrate improved electrochemical properties, even under elevated temperature conditions. This improvement is attributed to minimization of the side-reactions between the cathode and electrolyte by the AlPO4 protecting layer, the suppression of the formation of an undesirable SEI layer, and the partial absorption of the stress caused by the volume change during cycling. Therefore, surface modification by AlPO4 is an effective way to improve the performance of LiMn 1.5Ni 0.5O 4 cathode materials for lithium-ion batteries.

Original languageEnglish
Title of host publicationACS National Meeting Book of Abstracts
Publication statusPublished - 2011
Event241st ACS National Meeting and Exposition - Anaheim, CA, United States
Duration: 2011 Mar 272011 Mar 31

Other

Other241st ACS National Meeting and Exposition
CountryUnited States
CityAnaheim, CA
Period11/3/2711/3/31

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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