Surface studies of high voltage lithium rich composition: Li 1.2Mn0.525Ni0.175Co0.1O2

Surendra K. Martha; Jagjit Nanda; Gabriel M. Veith; Nancy J. Dudney

doi:10.1016/j.jpowsour.2012.05.049

Surface studies of high voltage lithium rich composition: Li _1.2Mn_0.525Ni_0.175Co_0.1O₂

Surendra K. Martha, Jagjit Nanda, Gabriel M. Veith, Nancy J. Dudney

Energy Storage & Conversion

Research output: Contribution to journal › Article › peer-review

136 Scopus citations

Abstract

This article reports the evidence of surface film formation due to the oxidation of electrolyte upon high voltage cycling (4.9 V) of the lithium rich cathode, Li_1.2Mn_0.525Ni_0.175Co _0.1O₂. We have studied the chemical composition of this surface film using electrochemical impedance, X-ray Photoelectron and micro-Raman spectroscopies and the results are compared against the pristine electrode. In order to distinguish the changes in the surface film composition induced by prolonged electrochemical cycling versus chemical passivation effect, we studied the surface composition of cathode powders aged with electrolytes at 60 °C. Our results show that after 150 cycles, the electrodes showed a rapid drop in capacity due to increase in the surface film resistance resulting in limited capacity utilization.

Original language	English
Pages (from-to)	179-186
Number of pages	8
Journal	Journal of Power Sources
Volume	216
DOIs	https://doi.org/10.1016/j.jpowsour.2012.05.049
State	Published - Oct 15 2012

Funding

Materials used in this study were supplied courtesy of Toda Materials Corporation, Japan, lithium rich Li 1.2 Mn 0.525 Ni 0.175 Co 0.1 O 2 . We thank Dr. Frank Delnick for technical discussion and valuable inputs for analysis of electrochemical impedance results. This work is supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy. GMV acknowledges support from the Office of Basic Energy Sciences , Materials Sciences and Engineering Division , U.S. Department of Energy .

Funders	Funder number
Office of Basic Energy Sciences
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Vehicle Technologies Office
Division of Materials Sciences and Engineering

Keywords

Impedance
Li-rich MNC
Lithium battery
Micro-Raman spectroscopy
Surface chemistry
XPS

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2012.05.049

Cite this

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title = "Surface studies of high voltage lithium rich composition: Li 1.2Mn0.525Ni0.175Co0.1O2",

abstract = "This article reports the evidence of surface film formation due to the oxidation of electrolyte upon high voltage cycling (4.9 V) of the lithium rich cathode, Li1.2Mn0.525Ni0.175Co 0.1O2. We have studied the chemical composition of this surface film using electrochemical impedance, X-ray Photoelectron and micro-Raman spectroscopies and the results are compared against the pristine electrode. In order to distinguish the changes in the surface film composition induced by prolonged electrochemical cycling versus chemical passivation effect, we studied the surface composition of cathode powders aged with electrolytes at 60 °C. Our results show that after 150 cycles, the electrodes showed a rapid drop in capacity due to increase in the surface film resistance resulting in limited capacity utilization.",

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AB - This article reports the evidence of surface film formation due to the oxidation of electrolyte upon high voltage cycling (4.9 V) of the lithium rich cathode, Li1.2Mn0.525Ni0.175Co 0.1O2. We have studied the chemical composition of this surface film using electrochemical impedance, X-ray Photoelectron and micro-Raman spectroscopies and the results are compared against the pristine electrode. In order to distinguish the changes in the surface film composition induced by prolonged electrochemical cycling versus chemical passivation effect, we studied the surface composition of cathode powders aged with electrolytes at 60 °C. Our results show that after 150 cycles, the electrodes showed a rapid drop in capacity due to increase in the surface film resistance resulting in limited capacity utilization.

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