Effect of Li powder-coated separator on irreversible behavior of SiOx-C anode in lithium-ion batteries

Sun Woo Hwang, Wooyoung Yoon

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Lithium powder coatings on anodes have been reported to reduce the irreversible first-cycle capacity loss in silicon monoxide (SiO<inf>x</inf>) anodes. Instead of electrodes, we coated a separator with Li powder to reduce the irreversible capacity. We assembled a SiO<inf>x</inf> anode and Li cobalt oxide (LCO) cathode coin cell (CR2032) with an Li-coated separator in an argon-filled glove box. The charge capacity of the obtained separator in a cell at 0.1 C was 1502.0 mAh g<sup>-1</sup> in the first cycle, while that of an uncoated separator was 1534.3 mAh g<sup>-1</sup>. The former also had a higher discharge capacity than the latter, 1334.2 compared to 1019.3 mAh g <sup>-1</sup>. Using electrochemical analysis it was estimated that the first cycle irreversible capacity loss ratio was 11.2% with the Li coating compared to the 33.6% capacity drop in pure SiO<inf>x</inf> cells. Morphology changes in the Li-coated separator are also observed using a scanning electron microscope. The results indicate that a uniform Li coating on a separator acts as an effective reserve layer, reducing the irreversible first-cycle capacity loss.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume161
Issue number10
DOIs
Publication statusPublished - 2014

Fingerprint

separators
Separators
Powders
electric batteries
Anodes
anodes
lithium
Silicon
silicon
ions
cycles
coatings
Coatings
Powder coatings
gloves
cell cathodes
Argon
cobalt oxides
Lithium
Lithium-ion batteries

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

@article{78aab01ee8914ef49833a7dc56a6a93e,
title = "Effect of Li powder-coated separator on irreversible behavior of SiOx-C anode in lithium-ion batteries",
abstract = "Lithium powder coatings on anodes have been reported to reduce the irreversible first-cycle capacity loss in silicon monoxide (SiOx) anodes. Instead of electrodes, we coated a separator with Li powder to reduce the irreversible capacity. We assembled a SiOx anode and Li cobalt oxide (LCO) cathode coin cell (CR2032) with an Li-coated separator in an argon-filled glove box. The charge capacity of the obtained separator in a cell at 0.1 C was 1502.0 mAh g-1 in the first cycle, while that of an uncoated separator was 1534.3 mAh g-1. The former also had a higher discharge capacity than the latter, 1334.2 compared to 1019.3 mAh g -1. Using electrochemical analysis it was estimated that the first cycle irreversible capacity loss ratio was 11.2{\%} with the Li coating compared to the 33.6{\%} capacity drop in pure SiOx cells. Morphology changes in the Li-coated separator are also observed using a scanning electron microscope. The results indicate that a uniform Li coating on a separator acts as an effective reserve layer, reducing the irreversible first-cycle capacity loss.",
author = "Hwang, {Sun Woo} and Wooyoung Yoon",
year = "2014",
doi = "10.1149/2.0031412jes",
language = "English",
volume = "161",
journal = "Journal of the Electrochemical Society",
issn = "0013-4651",
publisher = "Electrochemical Society, Inc.",
number = "10",

}

TY - JOUR

T1 - Effect of Li powder-coated separator on irreversible behavior of SiOx-C anode in lithium-ion batteries

AU - Hwang, Sun Woo

AU - Yoon, Wooyoung

PY - 2014

Y1 - 2014

N2 - Lithium powder coatings on anodes have been reported to reduce the irreversible first-cycle capacity loss in silicon monoxide (SiOx) anodes. Instead of electrodes, we coated a separator with Li powder to reduce the irreversible capacity. We assembled a SiOx anode and Li cobalt oxide (LCO) cathode coin cell (CR2032) with an Li-coated separator in an argon-filled glove box. The charge capacity of the obtained separator in a cell at 0.1 C was 1502.0 mAh g-1 in the first cycle, while that of an uncoated separator was 1534.3 mAh g-1. The former also had a higher discharge capacity than the latter, 1334.2 compared to 1019.3 mAh g -1. Using electrochemical analysis it was estimated that the first cycle irreversible capacity loss ratio was 11.2% with the Li coating compared to the 33.6% capacity drop in pure SiOx cells. Morphology changes in the Li-coated separator are also observed using a scanning electron microscope. The results indicate that a uniform Li coating on a separator acts as an effective reserve layer, reducing the irreversible first-cycle capacity loss.

AB - Lithium powder coatings on anodes have been reported to reduce the irreversible first-cycle capacity loss in silicon monoxide (SiOx) anodes. Instead of electrodes, we coated a separator with Li powder to reduce the irreversible capacity. We assembled a SiOx anode and Li cobalt oxide (LCO) cathode coin cell (CR2032) with an Li-coated separator in an argon-filled glove box. The charge capacity of the obtained separator in a cell at 0.1 C was 1502.0 mAh g-1 in the first cycle, while that of an uncoated separator was 1534.3 mAh g-1. The former also had a higher discharge capacity than the latter, 1334.2 compared to 1019.3 mAh g -1. Using electrochemical analysis it was estimated that the first cycle irreversible capacity loss ratio was 11.2% with the Li coating compared to the 33.6% capacity drop in pure SiOx cells. Morphology changes in the Li-coated separator are also observed using a scanning electron microscope. The results indicate that a uniform Li coating on a separator acts as an effective reserve layer, reducing the irreversible first-cycle capacity loss.

UR - http://www.scopus.com/inward/record.url?scp=84940295358&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84940295358&partnerID=8YFLogxK

U2 - 10.1149/2.0031412jes

DO - 10.1149/2.0031412jes

M3 - Article

AN - SCOPUS:84940295358

VL - 161

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 10

ER -