Enhanced electrochemical stability of high-voltage LiNi0.5Mn1.5O4 cathode by surface modification using atomic layer deposition

Research Paper

Abstract

We report improved cycling performance of high-voltage LiNi0.5Mn1.5O4 cathode for lithium-ion batteries by modifying its surface with ultrathin layer coating of Al2O3 (<1 nm) using atomic layer deposition (ALD) technique. Four and six layers of ALD Al2O3 were coated directly on the porous LiNi0.5Mn1.5O4 nanoparticle (~200 nm) slurry composite. Electrochemical characterization results show that LiNi0.5Mn1.5O4 electrode with four and six layers of ALD Al2O3 maintained 92 and 98 % of their initial capacity after 200 cycles, respectively, in comparison to bare LiNi0.5Mn1.5O4 electrode which showed 84 % capacity retention. We show that the ALD Al2O3 coated cathode surface is protected from undesired side reactions occurring at the electrode/electrolyte interface. For the first time, we used XPS studies to investigate the surface chemistry of ultrathin ALD Al2O3 coated LiNi0.5Mn1.5O4 and confirmed that the ultrathin ALD Al2O3 layer reduces side reactions involving organic components of the electrolyte decomposition product in high-voltage cathodes.

Keywords

Ultrathin coating Al2O3 Atomic layer deposition LiNi0.5Mn1.5O4 nanoparticle XPS investigation Li-ion battery Energy storage 

Supplementary material

11051_2014_2745_MOESM1_ESM.docx (512 kb)
Supplementary material 1 (DOCX 511 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of Chemistry and BiochemistryUniversity of MarylandCollege ParkUSA
  2. 2.Department of Materials Science and EngineeringUniversity of MarylandCollege ParkUSA
  3. 3.Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices DirectorateU.S. Army Research LaboratoryAdelphiUSA

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