Improved Li4Ti5O12 electrodes by modified current collector surface

Christina Toigo; Martin Frankenberger; Nicolas Billot; Claudia Pscherer; Benedikt Stumper; Fabian Distelrath; Jonathan Schubert; Karl Heinz Pettinger; Catia Arbizzani

doi:10.1016/j.electacta.2021.138978

Improved Li4Ti5O12 electrodes by modified current collector surface

Christina Toigo, Martin Frankenberger, Nicolas Billot, Claudia Pscherer, Benedikt Stumper, Fabian Distelrath, Jonathan Schubert, Karl Heinz Pettinger, Catia Arbizzani

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

7 Citations (Scopus)

Abstract

A copper current collector is treated by electrolytic deposition of copper dendrites at the surface of the foil. This treatment results in a more structured surface leading to an improved contact between the electrode materials and the current collector. The contact to the electrode material particles of different sizes is investigated. Active materials of submicron size exhibit a drastically reduced internal resistance and a clearly improved C-rate capability. BET surface area measurement and calculation of roughness factor resulted in the finding of dendritic copper foil to provide an 8-fold larger surface area compared to the untreated foil. A comprehensive electrochemical impedance spectroscopy study is conducted for elucidation of electrochemical utilisation of the surface area increase. As a result, both fitting parameters for capacitance and surface resistance correspond to a similar normalization shift, indicating a clear improvement in the electro-active interface area.

Original language	English
Article number	138978
Journal	Electrochimica Acta
Volume	392
DOIs	https://doi.org/10.1016/j.electacta.2021.138978
Publication status	Published - 1 Oct 2021
Externally published	Yes

Keywords

Copper dendrites
Current collector
Electrochemical impedance spectroscopy
LTO
Lithium titanium oxide
Lithium-ion battery
Surface modification

UN SDGs

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

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10.1016/j.electacta.2021.138978

Cite this

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title = "Improved Li4Ti5O12 electrodes by modified current collector surface",

abstract = "A copper current collector is treated by electrolytic deposition of copper dendrites at the surface of the foil. This treatment results in a more structured surface leading to an improved contact between the electrode materials and the current collector. The contact to the electrode material particles of different sizes is investigated. Active materials of submicron size exhibit a drastically reduced internal resistance and a clearly improved C-rate capability. BET surface area measurement and calculation of roughness factor resulted in the finding of dendritic copper foil to provide an 8-fold larger surface area compared to the untreated foil. A comprehensive electrochemical impedance spectroscopy study is conducted for elucidation of electrochemical utilisation of the surface area increase. As a result, both fitting parameters for capacitance and surface resistance correspond to a similar normalization shift, indicating a clear improvement in the electro-active interface area.",

keywords = "Copper dendrites, Current collector, Electrochemical impedance spectroscopy, LTO, Lithium titanium oxide, Lithium-ion battery, Surface modification",

author = "Christina Toigo and Martin Frankenberger and Nicolas Billot and Claudia Pscherer and Benedikt Stumper and Fabian Distelrath and Jonathan Schubert and Pettinger, {Karl Heinz} and Catia Arbizzani",

note = "Publisher Copyright: {\textcopyright} 2021 The Authors",

year = "2021",

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day = "1",

doi = "10.1016/j.electacta.2021.138978",

language = "English",

volume = "392",

journal = "Electrochimica Acta",

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TY - JOUR

T1 - Improved Li4Ti5O12 electrodes by modified current collector surface

AU - Toigo, Christina

AU - Frankenberger, Martin

AU - Billot, Nicolas

AU - Pscherer, Claudia

AU - Stumper, Benedikt

AU - Distelrath, Fabian

AU - Schubert, Jonathan

AU - Pettinger, Karl Heinz

AU - Arbizzani, Catia

PY - 2021/10/1

Y1 - 2021/10/1

N2 - A copper current collector is treated by electrolytic deposition of copper dendrites at the surface of the foil. This treatment results in a more structured surface leading to an improved contact between the electrode materials and the current collector. The contact to the electrode material particles of different sizes is investigated. Active materials of submicron size exhibit a drastically reduced internal resistance and a clearly improved C-rate capability. BET surface area measurement and calculation of roughness factor resulted in the finding of dendritic copper foil to provide an 8-fold larger surface area compared to the untreated foil. A comprehensive electrochemical impedance spectroscopy study is conducted for elucidation of electrochemical utilisation of the surface area increase. As a result, both fitting parameters for capacitance and surface resistance correspond to a similar normalization shift, indicating a clear improvement in the electro-active interface area.

AB - A copper current collector is treated by electrolytic deposition of copper dendrites at the surface of the foil. This treatment results in a more structured surface leading to an improved contact between the electrode materials and the current collector. The contact to the electrode material particles of different sizes is investigated. Active materials of submicron size exhibit a drastically reduced internal resistance and a clearly improved C-rate capability. BET surface area measurement and calculation of roughness factor resulted in the finding of dendritic copper foil to provide an 8-fold larger surface area compared to the untreated foil. A comprehensive electrochemical impedance spectroscopy study is conducted for elucidation of electrochemical utilisation of the surface area increase. As a result, both fitting parameters for capacitance and surface resistance correspond to a similar normalization shift, indicating a clear improvement in the electro-active interface area.

KW - Copper dendrites

KW - Current collector

KW - Electrochemical impedance spectroscopy

KW - LTO

KW - Lithium titanium oxide

KW - Lithium-ion battery

KW - Surface modification

UR - http://www.scopus.com/inward/record.url?scp=85112048373&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2021.138978

DO - 10.1016/j.electacta.2021.138978

M3 - Article

SN - 0013-4686

VL - 392

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 138978

ER -

Improved Li4Ti5O12 electrodes by modified current collector surface

Abstract

Keywords

UN SDGs

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