Improved Battery Performance of Nanocrystalline Si Anodes Utilized by Radio Frequency (RF) Sputtered Multifunctional Amorphous Si Coating Layers

In Kyoung Ahn; Young Joo Lee; Sekwon Na; So Yeon Lee; Dae Hyun Nam; Ji Hoon Lee; Young Chang Joo

doi:10.1021/acsami.7b17890

Improved Battery Performance of Nanocrystalline Si Anodes Utilized by Radio Frequency (RF) Sputtered Multifunctional Amorphous Si Coating Layers

In Kyoung Ahn
, Young Joo Lee
, Sekwon Na
, So Yeon Lee
, Dae Hyun Nam
, Ji Hoon Lee
, Young Chang Joo

Department of Materials Science and Engineering

Seoul National University

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

17 Scopus citations

Abstract

Despite the high theoretical specific capacity of Si, commercial Li-ion batteries (LIBs) based on Si are still not feasible because of unsatisfactory cycling stability. Herein, amorphous Si (a-Si)-coated nanocrystalline Si (nc-Si) formed by versatile radio frequency (RF) sputtering systems is proposed as a promising anode material for LIBs. Compared to uncoated nc-Si (retention of 0.6% and Coulombic efficiency (CE) of 79.7%), the a-Si-coated nc-Si (nc-Si@a-Si) anodes show greatly improved cycling retention (C_50th/C_first) of 50% and a first CE of 86.6%. From the ex situ investigation with electrochemical impedance spectroscopy (EIS) and cracked morphology during cycling, the a-Si layer was found to be highly effective at protecting the surface of the nc-Si from the formation of solid-state electrolyte interphases (SEI) and to dissipate the mechanical stress upon de/lithiation due to the high fracture toughness.

Original language	English
Pages (from-to)	2242-2248
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	3
DOIs	https://doi.org/10.1021/acsami.7b17890
State	Published - 24 Jan 2018

Keywords

amorphous Si
coating
Li-ion battery
RF sputter
Si anode

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title = "Improved Battery Performance of Nanocrystalline Si Anodes Utilized by Radio Frequency (RF) Sputtered Multifunctional Amorphous Si Coating Layers",

abstract = "Despite the high theoretical specific capacity of Si, commercial Li-ion batteries (LIBs) based on Si are still not feasible because of unsatisfactory cycling stability. Herein, amorphous Si (a-Si)-coated nanocrystalline Si (nc-Si) formed by versatile radio frequency (RF) sputtering systems is proposed as a promising anode material for LIBs. Compared to uncoated nc-Si (retention of 0.6\% and Coulombic efficiency (CE) of 79.7\%), the a-Si-coated nc-Si (nc-Si@a-Si) anodes show greatly improved cycling retention (C50th/Cfirst) of 50\% and a first CE of 86.6\%. From the ex situ investigation with electrochemical impedance spectroscopy (EIS) and cracked morphology during cycling, the a-Si layer was found to be highly effective at protecting the surface of the nc-Si from the formation of solid-state electrolyte interphases (SEI) and to dissipate the mechanical stress upon de/lithiation due to the high fracture toughness.",

keywords = "amorphous Si, coating, Li-ion battery, RF sputter, Si anode",

author = "Ahn, \{In Kyoung\} and Lee, \{Young Joo\} and Sekwon Na and Lee, \{So Yeon\} and Nam, \{Dae Hyun\} and Lee, \{Ji Hoon\} and Joo, \{Young Chang\}",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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doi = "10.1021/acsami.7b17890",

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T1 - Improved Battery Performance of Nanocrystalline Si Anodes Utilized by Radio Frequency (RF) Sputtered Multifunctional Amorphous Si Coating Layers

AU - Ahn, In Kyoung

AU - Lee, Young Joo

AU - Na, Sekwon

AU - Lee, So Yeon

AU - Nam, Dae Hyun

AU - Lee, Ji Hoon

AU - Joo, Young Chang

PY - 2018/1/24

Y1 - 2018/1/24

N2 - Despite the high theoretical specific capacity of Si, commercial Li-ion batteries (LIBs) based on Si are still not feasible because of unsatisfactory cycling stability. Herein, amorphous Si (a-Si)-coated nanocrystalline Si (nc-Si) formed by versatile radio frequency (RF) sputtering systems is proposed as a promising anode material for LIBs. Compared to uncoated nc-Si (retention of 0.6% and Coulombic efficiency (CE) of 79.7%), the a-Si-coated nc-Si (nc-Si@a-Si) anodes show greatly improved cycling retention (C50th/Cfirst) of 50% and a first CE of 86.6%. From the ex situ investigation with electrochemical impedance spectroscopy (EIS) and cracked morphology during cycling, the a-Si layer was found to be highly effective at protecting the surface of the nc-Si from the formation of solid-state electrolyte interphases (SEI) and to dissipate the mechanical stress upon de/lithiation due to the high fracture toughness.

AB - Despite the high theoretical specific capacity of Si, commercial Li-ion batteries (LIBs) based on Si are still not feasible because of unsatisfactory cycling stability. Herein, amorphous Si (a-Si)-coated nanocrystalline Si (nc-Si) formed by versatile radio frequency (RF) sputtering systems is proposed as a promising anode material for LIBs. Compared to uncoated nc-Si (retention of 0.6% and Coulombic efficiency (CE) of 79.7%), the a-Si-coated nc-Si (nc-Si@a-Si) anodes show greatly improved cycling retention (C50th/Cfirst) of 50% and a first CE of 86.6%. From the ex situ investigation with electrochemical impedance spectroscopy (EIS) and cracked morphology during cycling, the a-Si layer was found to be highly effective at protecting the surface of the nc-Si from the formation of solid-state electrolyte interphases (SEI) and to dissipate the mechanical stress upon de/lithiation due to the high fracture toughness.

KW - amorphous Si

KW - coating

KW - Li-ion battery

KW - RF sputter

KW - Si anode

UR - https://www.scopus.com/pages/publications/85041138493

U2 - 10.1021/acsami.7b17890

DO - 10.1021/acsami.7b17890

M3 - Article

C2 - 29308877

AN - SCOPUS:85041138493

SN - 1944-8244

VL - 10

SP - 2242

EP - 2248

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 3

ER -

Improved Battery Performance of Nanocrystalline Si Anodes Utilized by Radio Frequency (RF) Sputtered Multifunctional Amorphous Si Coating Layers

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Keywords

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