Insights into Solid-Electrolyte Interphase Induced Li-Ion Degradation from in Situ Auger Electron Spectroscopy

Ching Yen Tang; Yonghui Ma; Richard T. Haasch; Jia Hu Ouyang; Shen J. Dillon

doi:10.1021/acs.jpclett.7b02847

Insights into Solid-Electrolyte Interphase Induced Li-Ion Degradation from in Situ Auger Electron Spectroscopy

Ching Yen Tang, Yonghui Ma, Richard T. Haasch, Jia Hu Ouyang, Shen J. Dillon

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Abstract

Surface reactions occurring on LiMn₂O₄, LiCoO₂, LiNiO₂, Li[Ni_1/3Mn_1/3Co_1/3]O₂, and LiFePO₄ during charging and overcharging are studied by in situ and ex situ Auger electron spectroscopy. Carbon surface stability at the cathode solid-electrolyte interphase (SEI), associated with carbonate formation, decomposition, and CO/CO₂ evolution, on different electrodes during cycling correlates with their cycle life. To understand how associated CO and CO₂ evolution affects cycle stability, LiMn₂O₄ is cycled in flowing gas. Flowing Ar enhances cycle life by a factor of 2, while flowing Ar with 1% CO₂ reduces cycle life by a factor of 2. CO₂ is proposed to degrade cycle life by trapping Li and metal ions as carbonate in the anode SEI.

Original language	English (US)
Pages (from-to)	6226-6230
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	8
Issue number	24
DOIs	https://doi.org/10.1021/acs.jpclett.7b02847
State	Published - Dec 21 2017

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

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10.1021/acs.jpclett.7b02847

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title = "Insights into Solid-Electrolyte Interphase Induced Li-Ion Degradation from in Situ Auger Electron Spectroscopy",

abstract = "Surface reactions occurring on LiMn2O4, LiCoO2, LiNiO2, Li[Ni1/3Mn1/3Co1/3]O2, and LiFePO4 during charging and overcharging are studied by in situ and ex situ Auger electron spectroscopy. Carbon surface stability at the cathode solid-electrolyte interphase (SEI), associated with carbonate formation, decomposition, and CO/CO2 evolution, on different electrodes during cycling correlates with their cycle life. To understand how associated CO and CO2 evolution affects cycle stability, LiMn2O4 is cycled in flowing gas. Flowing Ar enhances cycle life by a factor of 2, while flowing Ar with 1% CO2 reduces cycle life by a factor of 2. CO2 is proposed to degrade cycle life by trapping Li and metal ions as carbonate in the anode SEI.",

author = "Tang, {Ching Yen} and Yonghui Ma and Haasch, {Richard T.} and Ouyang, {Jia Hu} and Dillon, {Shen J.}",

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AU - Ma, Yonghui

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AU - Ouyang, Jia Hu

AU - Dillon, Shen J.

PY - 2017/12/21

Y1 - 2017/12/21

N2 - Surface reactions occurring on LiMn2O4, LiCoO2, LiNiO2, Li[Ni1/3Mn1/3Co1/3]O2, and LiFePO4 during charging and overcharging are studied by in situ and ex situ Auger electron spectroscopy. Carbon surface stability at the cathode solid-electrolyte interphase (SEI), associated with carbonate formation, decomposition, and CO/CO2 evolution, on different electrodes during cycling correlates with their cycle life. To understand how associated CO and CO2 evolution affects cycle stability, LiMn2O4 is cycled in flowing gas. Flowing Ar enhances cycle life by a factor of 2, while flowing Ar with 1% CO2 reduces cycle life by a factor of 2. CO2 is proposed to degrade cycle life by trapping Li and metal ions as carbonate in the anode SEI.

AB - Surface reactions occurring on LiMn2O4, LiCoO2, LiNiO2, Li[Ni1/3Mn1/3Co1/3]O2, and LiFePO4 during charging and overcharging are studied by in situ and ex situ Auger electron spectroscopy. Carbon surface stability at the cathode solid-electrolyte interphase (SEI), associated with carbonate formation, decomposition, and CO/CO2 evolution, on different electrodes during cycling correlates with their cycle life. To understand how associated CO and CO2 evolution affects cycle stability, LiMn2O4 is cycled in flowing gas. Flowing Ar enhances cycle life by a factor of 2, while flowing Ar with 1% CO2 reduces cycle life by a factor of 2. CO2 is proposed to degrade cycle life by trapping Li and metal ions as carbonate in the anode SEI.

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Insights into Solid-Electrolyte Interphase Induced Li-Ion Degradation from in Situ Auger Electron Spectroscopy

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