In situ determination of the liquid/solid interface thickness and composition for the li ion cathode LiMn1.5Ni0.5O4

James F. Browning; Loïc Baggetto; Katherine L. Jungjohann; Yongqiang Wang; Wyatt E. Tenhaeff; Jong K. Keum; David L. Wood; Gabriel M. Veith

doi:10.1021/am5032055

In situ determination of the liquid/solid interface thickness and composition for the li ion cathode LiMn_1.5Ni_0.5O₄

James F. Browning, Loïc Baggetto, Katherine L. Jungjohann, Yongqiang Wang, Wyatt E. Tenhaeff, Jong K. Keum, David L. Wood, Gabriel M. Veith

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

70 Scopus citations

Abstract

Using neutron reflectometry, we have determined the thickness and scattering length density profile of the electrode-electrolyte interface for the high-voltage cathode LiMn_1.5Ni_0.5O₄ in situ at open circuit voltage and fully delithiated. Upon exposure to a liquid electrolyte, a thin 3.3 nm Li-rich interface forms due to the ordering of the electrolyte on the cathode surface. This interface changes in composition, as evident by an increase in the scattering length density of the new layer, with charging as the condensed layer evolves from being lithium rich to one containing a much higher concentration of F from the LiPF₆ salt. These results show the surface chemistry evolves as a function of the potential.

Original language	English
Pages (from-to)	18569-18576
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	6
Issue number	21
DOIs	https://doi.org/10.1021/am5032055
State	Published - Nov 12 2014

Keywords

Li ion batteries
SEI layer
in situ battery
liquid-solid interface
neutron reflectometry

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10.1021/am5032055

Cite this

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title = "In situ determination of the liquid/solid interface thickness and composition for the li ion cathode LiMn1.5Ni0.5O4",

abstract = "Using neutron reflectometry, we have determined the thickness and scattering length density profile of the electrode-electrolyte interface for the high-voltage cathode LiMn1.5Ni0.5O4 in situ at open circuit voltage and fully delithiated. Upon exposure to a liquid electrolyte, a thin 3.3 nm Li-rich interface forms due to the ordering of the electrolyte on the cathode surface. This interface changes in composition, as evident by an increase in the scattering length density of the new layer, with charging as the condensed layer evolves from being lithium rich to one containing a much higher concentration of F from the LiPF6 salt. These results show the surface chemistry evolves as a function of the potential.",

keywords = "Li ion batteries, SEI layer, in situ battery, liquid-solid interface, neutron reflectometry",

author = "Browning, {James F.} and Lo{\"i}c Baggetto and Jungjohann, {Katherine L.} and Yongqiang Wang and Tenhaeff, {Wyatt E.} and Keum, {Jong K.} and Wood, {David L.} and Veith, {Gabriel M.}",

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year = "2014",

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doi = "10.1021/am5032055",

language = "English",

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T1 - In situ determination of the liquid/solid interface thickness and composition for the li ion cathode LiMn1.5Ni0.5O4

AU - Browning, James F.

AU - Baggetto, Loïc

AU - Jungjohann, Katherine L.

AU - Wang, Yongqiang

AU - Tenhaeff, Wyatt E.

AU - Keum, Jong K.

AU - Wood, David L.

AU - Veith, Gabriel M.

PY - 2014/11/12

Y1 - 2014/11/12

N2 - Using neutron reflectometry, we have determined the thickness and scattering length density profile of the electrode-electrolyte interface for the high-voltage cathode LiMn1.5Ni0.5O4 in situ at open circuit voltage and fully delithiated. Upon exposure to a liquid electrolyte, a thin 3.3 nm Li-rich interface forms due to the ordering of the electrolyte on the cathode surface. This interface changes in composition, as evident by an increase in the scattering length density of the new layer, with charging as the condensed layer evolves from being lithium rich to one containing a much higher concentration of F from the LiPF6 salt. These results show the surface chemistry evolves as a function of the potential.

AB - Using neutron reflectometry, we have determined the thickness and scattering length density profile of the electrode-electrolyte interface for the high-voltage cathode LiMn1.5Ni0.5O4 in situ at open circuit voltage and fully delithiated. Upon exposure to a liquid electrolyte, a thin 3.3 nm Li-rich interface forms due to the ordering of the electrolyte on the cathode surface. This interface changes in composition, as evident by an increase in the scattering length density of the new layer, with charging as the condensed layer evolves from being lithium rich to one containing a much higher concentration of F from the LiPF6 salt. These results show the surface chemistry evolves as a function of the potential.

KW - Li ion batteries

KW - SEI layer

KW - in situ battery

KW - liquid-solid interface

KW - neutron reflectometry

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