Electrochemical lithiation of graphene-supported silicon and germanium for rechargeable batteries

Aaron Michael Chockla; Matthew G. Panthani; Vincent C. Holmberg; Colin M. Hessel; Dariya K. Reid; Timothy D. Bogart; Justin T. Harris; C. Buddie Mullins; Brian A. Korgel

doi:10.1021/jp302344b

Electrochemical lithiation of graphene-supported silicon and germanium for rechargeable batteries

Aaron Michael Chockla, Matthew G. Panthani, Vincent C. Holmberg, Colin M. Hessel, Dariya K. Reid, Timothy D. Bogart, Justin T. Harris, C. Buddie Mullins, Brian A. Korgel^*

^*Corresponding author for this work

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Abstract

Binder-free graphene-supported Ge nanowires, Si nanowires, and Si nanocrystals were studied for use as negative electrode materials in rechargeable lithium ion batteries (LIBs). Graphene obtained from reduced graphene oxide (RGO) helped stabilize electrochemical cycling of all of the nanomaterials. However, differential capacity plots revealed competition between RGO and Si/Ge lithiation. At high Si/Ge loading (>50% w/w) and low cycle rates (<C/10), only lithiation of Si and Ge occurs, but at higher cycle rates (>C/10), RGO lithiation begins to dominate. Under those conditions, only Ge nanowires exhibited significant lithiation relative to RGO, most likely due to the inherently faster lithiation of Ge compared to Si.

Original language	English (US)
Pages (from-to)	11917-11923
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	22
DOIs	https://doi.org/10.1021/jp302344b
State	Published - Jun 7 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Surfaces, Coatings and Films
Physical and Theoretical Chemistry

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

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10.1021/jp302344b

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title = "Electrochemical lithiation of graphene-supported silicon and germanium for rechargeable batteries",

abstract = "Binder-free graphene-supported Ge nanowires, Si nanowires, and Si nanocrystals were studied for use as negative electrode materials in rechargeable lithium ion batteries (LIBs). Graphene obtained from reduced graphene oxide (RGO) helped stabilize electrochemical cycling of all of the nanomaterials. However, differential capacity plots revealed competition between RGO and Si/Ge lithiation. At high Si/Ge loading (>50% w/w) and low cycle rates (<C/10), only lithiation of Si and Ge occurs, but at higher cycle rates (>C/10), RGO lithiation begins to dominate. Under those conditions, only Ge nanowires exhibited significant lithiation relative to RGO, most likely due to the inherently faster lithiation of Ge compared to Si.",

author = "Chockla, {Aaron Michael} and Panthani, {Matthew G.} and Holmberg, {Vincent C.} and Hessel, {Colin M.} and Reid, {Dariya K.} and Bogart, {Timothy D.} and Harris, {Justin T.} and Mullins, {C. Buddie} and Korgel, {Brian A.}",

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doi = "10.1021/jp302344b",

language = "English (US)",

volume = "116",

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journal = "Journal of Physical Chemistry C",

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publisher = "American Chemical Society",

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TY - JOUR

T1 - Electrochemical lithiation of graphene-supported silicon and germanium for rechargeable batteries

AU - Chockla, Aaron Michael

AU - Panthani, Matthew G.

AU - Holmberg, Vincent C.

AU - Hessel, Colin M.

AU - Reid, Dariya K.

AU - Bogart, Timothy D.

AU - Harris, Justin T.

AU - Mullins, C. Buddie

AU - Korgel, Brian A.

PY - 2012/6/7

Y1 - 2012/6/7

N2 - Binder-free graphene-supported Ge nanowires, Si nanowires, and Si nanocrystals were studied for use as negative electrode materials in rechargeable lithium ion batteries (LIBs). Graphene obtained from reduced graphene oxide (RGO) helped stabilize electrochemical cycling of all of the nanomaterials. However, differential capacity plots revealed competition between RGO and Si/Ge lithiation. At high Si/Ge loading (>50% w/w) and low cycle rates (<C/10), only lithiation of Si and Ge occurs, but at higher cycle rates (>C/10), RGO lithiation begins to dominate. Under those conditions, only Ge nanowires exhibited significant lithiation relative to RGO, most likely due to the inherently faster lithiation of Ge compared to Si.

AB - Binder-free graphene-supported Ge nanowires, Si nanowires, and Si nanocrystals were studied for use as negative electrode materials in rechargeable lithium ion batteries (LIBs). Graphene obtained from reduced graphene oxide (RGO) helped stabilize electrochemical cycling of all of the nanomaterials. However, differential capacity plots revealed competition between RGO and Si/Ge lithiation. At high Si/Ge loading (>50% w/w) and low cycle rates (<C/10), only lithiation of Si and Ge occurs, but at higher cycle rates (>C/10), RGO lithiation begins to dominate. Under those conditions, only Ge nanowires exhibited significant lithiation relative to RGO, most likely due to the inherently faster lithiation of Ge compared to Si.

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IS - 22

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Electrochemical lithiation of graphene-supported silicon and germanium for rechargeable batteries

Abstract

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