Stabilizing High-Voltage LiNi0.5Mn1.5O4 Cathodes for High Energy Rechargeable Li Batteries by Coating With Organic Aromatic Acids and Their Li Salts

Sandipan Maiti, Hadar Sclar, Judith Grinblat, Michael Talianker, Yuval Elias, Xiaohan Wu, Aleksandr Kondrakov, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Here, three types of surface coatings based on adsorption of organic aromatic acids or their Li salts are applied as functional coating substrates to engineer the surface properties of high voltage LiNi0.5Mn1.5O4 (LNMO) spinel cathodes. The materials used as coating include 1,3,5-benzene-tricarboxylic acid (trimesic acid [TMA]), its Li-salt, and 1,4-benzene-dicarboxylic acid (terephthalic acid). The surface coating involves simple ethanol liquid-phase mixing and low-temperature heat treatment under nitrogen flow. In typical comparative studies, TMA-coated (3–5%) LNMO cathodes deliver >90% capacity retention after 400 cycles with significantly improved rate performance in Li-coin cells at 30 °C compared to uncoated material with capacity retention of ≈40%. The cathode coating also prevents the rapid drop in the electrochemical activity of high voltage Li cells at 55 °C. Studies of high voltage full cells containing TMA coated cathodes versus graphite anodes also demonstrate improved electrochemical behavior, including improved cycling performance and capacity retention, increased rate capabilities, lower voltage hysteresis, and very minor direct current internal resistance evolution. In line with the highly positive effects on the electrochemical performance, it is found that these coatings reduce detrimental transition metal cations dissolution and ensure structural stability during prolonged cycling and thermal stability at elevated temperatures.

Original languageEnglish
Article number2200674
JournalSmall Methods
Volume6
Issue number10
DOIs
StatePublished - 1 Oct 2022

Keywords

  • LiNi Mn O (LNMO) spinel
  • benzene carboxylic acids
  • high-voltage cathodes
  • lithium-ion batteries
  • surface coatings

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science

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