Conjugated polymer energy level shifts in lithium-ion battery electrolytes

Charles Kiseok Song; Brian J. Eckstein; Teck Lip Dexter Tam; Lynn Trahey; Tobin J. Marks

doi:10.1021/am505416m

Conjugated polymer energy level shifts in lithium-ion battery electrolytes

Charles Kiseok Song, Brian J. Eckstein, Teck Lip Dexter Tam, Lynn Trahey^*, Tobin J. Marks

^*Corresponding author for this work

Chemistry

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

40 Scopus citations

Abstract

The ionization potentials (IPs) and electron affinities (EAs) of widely used conjugated polymers are evaluated by cyclic voltammetry (CV) in conventional electrochemical and lithium-ion battery media, and also by ultraviolet photoelectron spectroscopy (UPS) in vacuo. By comparing the data obtained in the different systems, it is found that the IPs of the conjugated polymer films determined by conventional CV (IP_C) can be correlated with UPS-measured HOMO energy levels (E_H,UPS) by the relationship E_H,UPS = (1.14 ± 0.23) × qIP_C + (4.62 ± 0.10) eV, where q is the electron charge. It is also found that the EAs of the conjugated polymer films measured via CV in conventional (EA_C) and Li⁺ battery (EA_B) media can be linearly correlated by the relationship EA_B = (1.07 ± 0.13) × EA_C + (2.84 ± 0.22) V. The slopes and intercepts of these equations can be correlated with the dielectric constants of the polymer film environments and the redox potentials of the reference electrodes, as modified by the surrounding electrolyte, respectively.

Original language	English (US)
Pages (from-to)	19347-19354
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	6
Issue number	21
DOIs	https://doi.org/10.1021/am505416m
State	Published - Nov 12 2014

Keywords

conjugated polymer
cyclic voltammetry
electrolyte
electron affinity
lithium-ion battery
organic photovoltaics

ASJC Scopus subject areas

General Materials Science

UN SDGs

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

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10.1021/am505416m

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@article{3eeb57442a4b4db4b605a2f788baeef1,

title = "Conjugated polymer energy level shifts in lithium-ion battery electrolytes",

abstract = "The ionization potentials (IPs) and electron affinities (EAs) of widely used conjugated polymers are evaluated by cyclic voltammetry (CV) in conventional electrochemical and lithium-ion battery media, and also by ultraviolet photoelectron spectroscopy (UPS) in vacuo. By comparing the data obtained in the different systems, it is found that the IPs of the conjugated polymer films determined by conventional CV (IPC) can be correlated with UPS-measured HOMO energy levels (EH,UPS) by the relationship EH,UPS = (1.14 ± 0.23) × qIPC + (4.62 ± 0.10) eV, where q is the electron charge. It is also found that the EAs of the conjugated polymer films measured via CV in conventional (EAC) and Li+ battery (EAB) media can be linearly correlated by the relationship EAB = (1.07 ± 0.13) × EAC + (2.84 ± 0.22) V. The slopes and intercepts of these equations can be correlated with the dielectric constants of the polymer film environments and the redox potentials of the reference electrodes, as modified by the surrounding electrolyte, respectively.",

keywords = "conjugated polymer, cyclic voltammetry, electrolyte, electron affinity, lithium-ion battery, organic photovoltaics",

author = "Song, {Charles Kiseok} and Eckstein, {Brian J.} and Tam, {Teck Lip Dexter} and Lynn Trahey and Marks, {Tobin J.}",

note = "Publisher Copyright: {\textcopyright} 2014 American Chemical Society.",

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doi = "10.1021/am505416m",

language = "English (US)",

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T1 - Conjugated polymer energy level shifts in lithium-ion battery electrolytes

AU - Song, Charles Kiseok

AU - Eckstein, Brian J.

AU - Tam, Teck Lip Dexter

AU - Trahey, Lynn

AU - Marks, Tobin J.

PY - 2014/11/12

Y1 - 2014/11/12

N2 - The ionization potentials (IPs) and electron affinities (EAs) of widely used conjugated polymers are evaluated by cyclic voltammetry (CV) in conventional electrochemical and lithium-ion battery media, and also by ultraviolet photoelectron spectroscopy (UPS) in vacuo. By comparing the data obtained in the different systems, it is found that the IPs of the conjugated polymer films determined by conventional CV (IPC) can be correlated with UPS-measured HOMO energy levels (EH,UPS) by the relationship EH,UPS = (1.14 ± 0.23) × qIPC + (4.62 ± 0.10) eV, where q is the electron charge. It is also found that the EAs of the conjugated polymer films measured via CV in conventional (EAC) and Li+ battery (EAB) media can be linearly correlated by the relationship EAB = (1.07 ± 0.13) × EAC + (2.84 ± 0.22) V. The slopes and intercepts of these equations can be correlated with the dielectric constants of the polymer film environments and the redox potentials of the reference electrodes, as modified by the surrounding electrolyte, respectively.

AB - The ionization potentials (IPs) and electron affinities (EAs) of widely used conjugated polymers are evaluated by cyclic voltammetry (CV) in conventional electrochemical and lithium-ion battery media, and also by ultraviolet photoelectron spectroscopy (UPS) in vacuo. By comparing the data obtained in the different systems, it is found that the IPs of the conjugated polymer films determined by conventional CV (IPC) can be correlated with UPS-measured HOMO energy levels (EH,UPS) by the relationship EH,UPS = (1.14 ± 0.23) × qIPC + (4.62 ± 0.10) eV, where q is the electron charge. It is also found that the EAs of the conjugated polymer films measured via CV in conventional (EAC) and Li+ battery (EAB) media can be linearly correlated by the relationship EAB = (1.07 ± 0.13) × EAC + (2.84 ± 0.22) V. The slopes and intercepts of these equations can be correlated with the dielectric constants of the polymer film environments and the redox potentials of the reference electrodes, as modified by the surrounding electrolyte, respectively.

KW - conjugated polymer

KW - cyclic voltammetry

KW - electrolyte

KW - electron affinity

KW - lithium-ion battery

KW - organic photovoltaics

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Conjugated polymer energy level shifts in lithium-ion battery electrolytes

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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