3D amorphous silicon on nanopillar copper electrodes as anodes for high-rate lithium-ion batteries

Gyu-Tae Kim, Sookyung Jeong, Ju Hyeon Shin, Jaephil Cho, Heon Lee

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

We present an amorphous Si anode deposited on a Cu nanopillar current collector, fabricated using a thermal roll-to-roll process followed by electroformation and LPCVD, for application in high-rate Li-ion batteries. Cu nanopillar current collectors with diameters of 250 and 500 nm were patterned periodically with 1 μm pitch and 2 μm height to optimize the diameters of the pillars for better electrochemical performance. Void spaces between Cu nanopillars allowed not only greater effective control of the strain caused by the Si expansion during lithiation than that allowed by a nonpatterned electrode but also significantly improved cycle performance even at 20 C measured after the same rate test: After 100 cycles at 0.5 C, the patterned electrodes with 250 and 500 nm diameter nanopillars showed high capacity retentions of 86% and 84%, respectively. These electrodes retained discharge capacities of 1057 and 780 mAh/g even at 20 C, respectively.

Original languageEnglish
Pages (from-to)1907-1912
Number of pages6
JournalACS Nano
Volume8
Issue number2
DOIs
Publication statusPublished - 2014 Feb 25

Fingerprint

Amorphous silicon
amorphous silicon
electric batteries
Copper
Anodes
anodes
lithium
copper
accumulators
Electrodes
electrodes
ions
cycles
voids
expansion
Lithium-ion batteries

Keywords

  • high C rate
  • Li-ion battery
  • patterned current collector
  • roll to roll
  • thin-film Si

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

3D amorphous silicon on nanopillar copper electrodes as anodes for high-rate lithium-ion batteries. / Kim, Gyu-Tae; Jeong, Sookyung; Shin, Ju Hyeon; Cho, Jaephil; Lee, Heon.

In: ACS Nano, Vol. 8, No. 2, 25.02.2014, p. 1907-1912.

Research output: Contribution to journalArticle

Kim, Gyu-Tae ; Jeong, Sookyung ; Shin, Ju Hyeon ; Cho, Jaephil ; Lee, Heon. / 3D amorphous silicon on nanopillar copper electrodes as anodes for high-rate lithium-ion batteries. In: ACS Nano. 2014 ; Vol. 8, No. 2. pp. 1907-1912.
@article{d09dcb88b3da47c8abd2ddeb59fd14fe,
title = "3D amorphous silicon on nanopillar copper electrodes as anodes for high-rate lithium-ion batteries",
abstract = "We present an amorphous Si anode deposited on a Cu nanopillar current collector, fabricated using a thermal roll-to-roll process followed by electroformation and LPCVD, for application in high-rate Li-ion batteries. Cu nanopillar current collectors with diameters of 250 and 500 nm were patterned periodically with 1 μm pitch and 2 μm height to optimize the diameters of the pillars for better electrochemical performance. Void spaces between Cu nanopillars allowed not only greater effective control of the strain caused by the Si expansion during lithiation than that allowed by a nonpatterned electrode but also significantly improved cycle performance even at 20 C measured after the same rate test: After 100 cycles at 0.5 C, the patterned electrodes with 250 and 500 nm diameter nanopillars showed high capacity retentions of 86{\%} and 84{\%}, respectively. These electrodes retained discharge capacities of 1057 and 780 mAh/g even at 20 C, respectively.",
keywords = "high C rate, Li-ion battery, patterned current collector, roll to roll, thin-film Si",
author = "Gyu-Tae Kim and Sookyung Jeong and Shin, {Ju Hyeon} and Jaephil Cho and Heon Lee",
year = "2014",
month = "2",
day = "25",
doi = "10.1021/nn406464c",
language = "English",
volume = "8",
pages = "1907--1912",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "2",

}

TY - JOUR

T1 - 3D amorphous silicon on nanopillar copper electrodes as anodes for high-rate lithium-ion batteries

AU - Kim, Gyu-Tae

AU - Jeong, Sookyung

AU - Shin, Ju Hyeon

AU - Cho, Jaephil

AU - Lee, Heon

PY - 2014/2/25

Y1 - 2014/2/25

N2 - We present an amorphous Si anode deposited on a Cu nanopillar current collector, fabricated using a thermal roll-to-roll process followed by electroformation and LPCVD, for application in high-rate Li-ion batteries. Cu nanopillar current collectors with diameters of 250 and 500 nm were patterned periodically with 1 μm pitch and 2 μm height to optimize the diameters of the pillars for better electrochemical performance. Void spaces between Cu nanopillars allowed not only greater effective control of the strain caused by the Si expansion during lithiation than that allowed by a nonpatterned electrode but also significantly improved cycle performance even at 20 C measured after the same rate test: After 100 cycles at 0.5 C, the patterned electrodes with 250 and 500 nm diameter nanopillars showed high capacity retentions of 86% and 84%, respectively. These electrodes retained discharge capacities of 1057 and 780 mAh/g even at 20 C, respectively.

AB - We present an amorphous Si anode deposited on a Cu nanopillar current collector, fabricated using a thermal roll-to-roll process followed by electroformation and LPCVD, for application in high-rate Li-ion batteries. Cu nanopillar current collectors with diameters of 250 and 500 nm were patterned periodically with 1 μm pitch and 2 μm height to optimize the diameters of the pillars for better electrochemical performance. Void spaces between Cu nanopillars allowed not only greater effective control of the strain caused by the Si expansion during lithiation than that allowed by a nonpatterned electrode but also significantly improved cycle performance even at 20 C measured after the same rate test: After 100 cycles at 0.5 C, the patterned electrodes with 250 and 500 nm diameter nanopillars showed high capacity retentions of 86% and 84%, respectively. These electrodes retained discharge capacities of 1057 and 780 mAh/g even at 20 C, respectively.

KW - high C rate

KW - Li-ion battery

KW - patterned current collector

KW - roll to roll

KW - thin-film Si

UR - http://www.scopus.com/inward/record.url?scp=84894621826&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894621826&partnerID=8YFLogxK

U2 - 10.1021/nn406464c

DO - 10.1021/nn406464c

M3 - Article

AN - SCOPUS:84894621826

VL - 8

SP - 1907

EP - 1912

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

IS - 2

ER -