One-minute deposition of micrometre-thick porous Si-Cu anodes with compositional gradients on Cu current collectors for lithium secondary batteries

Jungho Lee, Kei Hasegawa, Toshiyuki Momma, Tetsuya Osaka, Suguru Noda

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We report micrometre-thick porous Si-Cu anodes that are rapidly co-deposited on Cu current collectors in 1 min. This rapid deposition is realized by heating Si and Cu powders to ∼2000 °C and elevating their vapour pressures, while the porous and amorphous anode structure is realized by keeping the substrates at 100 °C. The films spontaneously form a 2-4.5-μm-thick composition gradient that changes from a Cu-rich region at the bottom to a Si-rich region at the top of the film, because of the higher vapour pressure for Cu than Si. A small addition of 5 wt% Cu to the Si source enhances the cycle performance of the film remarkably in a half-cell test, yielding a gravimetric capacity of 1250 mAh g<inf>film</inf><sup>-1</sup>, a volumetric capacity of 1956 mAh cm<inf>film</inf><sup>-3</sup>, and an areal capacity of 0.96 mAh cm<inf>anode</inf><sup>-2</sup> at the 100th cycle. However, excess addition of Cu causes partial Si crystallization in the films, which results in poorer cycle performance. While further improvement is needed, this rapid vapour deposition method yields Si-Cu films with compositional gradients on Cu current collectors in 1 min using inexpensive and safe Si and Cu powder sources, and is attractive for practical Si-based anode fabrication.

Original languageEnglish
Pages (from-to)540-550
Number of pages11
JournalJournal of Power Sources
Volume286
DOIs
Publication statusPublished - 2015 Jul 15

Fingerprint

storage batteries
Secondary batteries
lithium batteries
Lithium
accumulators
micrometers
Anodes
anodes
gradients
Vapor pressure
Powders
vapor pressure
cycles
Vapor deposition
Crystallization
vapor deposition
crystallization
Heating
Fabrication
fabrication

Keywords

  • Anodes
  • Compositional gradients
  • Lithium secondary batteries
  • Physical vapour deposition
  • Porous films
  • Silicon-copper alloy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

@article{f21bc274b8e54929ac7b8b48100d4d3e,
title = "One-minute deposition of micrometre-thick porous Si-Cu anodes with compositional gradients on Cu current collectors for lithium secondary batteries",
abstract = "We report micrometre-thick porous Si-Cu anodes that are rapidly co-deposited on Cu current collectors in 1 min. This rapid deposition is realized by heating Si and Cu powders to ∼2000 °C and elevating their vapour pressures, while the porous and amorphous anode structure is realized by keeping the substrates at 100 °C. The films spontaneously form a 2-4.5-μm-thick composition gradient that changes from a Cu-rich region at the bottom to a Si-rich region at the top of the film, because of the higher vapour pressure for Cu than Si. A small addition of 5 wt{\%} Cu to the Si source enhances the cycle performance of the film remarkably in a half-cell test, yielding a gravimetric capacity of 1250 mAh gfilm-1, a volumetric capacity of 1956 mAh cmfilm-3, and an areal capacity of 0.96 mAh cmanode-2 at the 100th cycle. However, excess addition of Cu causes partial Si crystallization in the films, which results in poorer cycle performance. While further improvement is needed, this rapid vapour deposition method yields Si-Cu films with compositional gradients on Cu current collectors in 1 min using inexpensive and safe Si and Cu powder sources, and is attractive for practical Si-based anode fabrication.",
keywords = "Anodes, Compositional gradients, Lithium secondary batteries, Physical vapour deposition, Porous films, Silicon-copper alloy",
author = "Jungho Lee and Kei Hasegawa and Toshiyuki Momma and Tetsuya Osaka and Suguru Noda",
year = "2015",
month = "7",
day = "15",
doi = "10.1016/j.jpowsour.2015.04.024",
language = "English",
volume = "286",
pages = "540--550",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

TY - JOUR

T1 - One-minute deposition of micrometre-thick porous Si-Cu anodes with compositional gradients on Cu current collectors for lithium secondary batteries

AU - Lee, Jungho

AU - Hasegawa, Kei

AU - Momma, Toshiyuki

AU - Osaka, Tetsuya

AU - Noda, Suguru

PY - 2015/7/15

Y1 - 2015/7/15

N2 - We report micrometre-thick porous Si-Cu anodes that are rapidly co-deposited on Cu current collectors in 1 min. This rapid deposition is realized by heating Si and Cu powders to ∼2000 °C and elevating their vapour pressures, while the porous and amorphous anode structure is realized by keeping the substrates at 100 °C. The films spontaneously form a 2-4.5-μm-thick composition gradient that changes from a Cu-rich region at the bottom to a Si-rich region at the top of the film, because of the higher vapour pressure for Cu than Si. A small addition of 5 wt% Cu to the Si source enhances the cycle performance of the film remarkably in a half-cell test, yielding a gravimetric capacity of 1250 mAh gfilm-1, a volumetric capacity of 1956 mAh cmfilm-3, and an areal capacity of 0.96 mAh cmanode-2 at the 100th cycle. However, excess addition of Cu causes partial Si crystallization in the films, which results in poorer cycle performance. While further improvement is needed, this rapid vapour deposition method yields Si-Cu films with compositional gradients on Cu current collectors in 1 min using inexpensive and safe Si and Cu powder sources, and is attractive for practical Si-based anode fabrication.

AB - We report micrometre-thick porous Si-Cu anodes that are rapidly co-deposited on Cu current collectors in 1 min. This rapid deposition is realized by heating Si and Cu powders to ∼2000 °C and elevating their vapour pressures, while the porous and amorphous anode structure is realized by keeping the substrates at 100 °C. The films spontaneously form a 2-4.5-μm-thick composition gradient that changes from a Cu-rich region at the bottom to a Si-rich region at the top of the film, because of the higher vapour pressure for Cu than Si. A small addition of 5 wt% Cu to the Si source enhances the cycle performance of the film remarkably in a half-cell test, yielding a gravimetric capacity of 1250 mAh gfilm-1, a volumetric capacity of 1956 mAh cmfilm-3, and an areal capacity of 0.96 mAh cmanode-2 at the 100th cycle. However, excess addition of Cu causes partial Si crystallization in the films, which results in poorer cycle performance. While further improvement is needed, this rapid vapour deposition method yields Si-Cu films with compositional gradients on Cu current collectors in 1 min using inexpensive and safe Si and Cu powder sources, and is attractive for practical Si-based anode fabrication.

KW - Anodes

KW - Compositional gradients

KW - Lithium secondary batteries

KW - Physical vapour deposition

KW - Porous films

KW - Silicon-copper alloy

UR - http://www.scopus.com/inward/record.url?scp=84927136696&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84927136696&partnerID=8YFLogxK

U2 - 10.1016/j.jpowsour.2015.04.024

DO - 10.1016/j.jpowsour.2015.04.024

M3 - Article

VL - 286

SP - 540

EP - 550

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -