Abstract
Silicon micropillars with tunable sizes are successfully fabricated on copper foils by using nanosecond-pulsed laser irradiation and then used as anodes for lithium-ion batteries. The size of the silicon micropillars is manipulated by using different slurry layer thicknesses ranging from a few microns to tens of microns. The effects of the pillar size on electrochemical properties are thoroughly investigated. The smaller the pillars, the better the electrochemical performance. A capacity of 1647 mAh g-1 at 0.1 C current rate is achieved in the anode with the smallest pillars, with 1215, 892, and 582 mAh g-1 at 0.2, 0.5, and 1.0 C, respectively. Although a significant difference in discharge capacity is observed in the early period of cycling among micropillars of different sizes, this discrepancy becomes smaller as a function of the cycle number. Morphological studies reveal that the expansion of micropillars occurred during long-term cycling, which finally led to the formation of island-like structures. Also, the formation of a solid electrolyte interphase film obstructs Li+ diffusion into Si for lithiation, resulting in capacity decay. This study demonstrates the importance of minimizing the pillar size and optimizing the pillar density during anode fabrication.
| Original language | English |
|---|---|
| Article number | 3623 |
| Journal | Applied Sciences (Switzerland) |
| Volume | 9 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 2019 Sep 1 |
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Keywords
- Anode
- Lithium-ion batteries
- Microstructure
- Selective laser melting
- Silicon micropillars
ASJC Scopus subject areas
- Materials Science(all)
- Instrumentation
- Engineering(all)
- Process Chemistry and Technology
- Computer Science Applications
- Fluid Flow and Transfer Processes
Cite this
Effect of the pillar size on the electrochemical performance of laser-induced silicon micropillars as anodes for lithium-ion batteries. / Yang, Xueyuan; Tachikawa, Naoki; Katayama, Yasushi; Li, Lin; Yan, Jiwang.
In: Applied Sciences (Switzerland), Vol. 9, No. 17, 3623, 01.09.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of the pillar size on the electrochemical performance of laser-induced silicon micropillars as anodes for lithium-ion batteries
AU - Yang, Xueyuan
AU - Tachikawa, Naoki
AU - Katayama, Yasushi
AU - Li, Lin
AU - Yan, Jiwang
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Silicon micropillars with tunable sizes are successfully fabricated on copper foils by using nanosecond-pulsed laser irradiation and then used as anodes for lithium-ion batteries. The size of the silicon micropillars is manipulated by using different slurry layer thicknesses ranging from a few microns to tens of microns. The effects of the pillar size on electrochemical properties are thoroughly investigated. The smaller the pillars, the better the electrochemical performance. A capacity of 1647 mAh g-1 at 0.1 C current rate is achieved in the anode with the smallest pillars, with 1215, 892, and 582 mAh g-1 at 0.2, 0.5, and 1.0 C, respectively. Although a significant difference in discharge capacity is observed in the early period of cycling among micropillars of different sizes, this discrepancy becomes smaller as a function of the cycle number. Morphological studies reveal that the expansion of micropillars occurred during long-term cycling, which finally led to the formation of island-like structures. Also, the formation of a solid electrolyte interphase film obstructs Li+ diffusion into Si for lithiation, resulting in capacity decay. This study demonstrates the importance of minimizing the pillar size and optimizing the pillar density during anode fabrication.
AB - Silicon micropillars with tunable sizes are successfully fabricated on copper foils by using nanosecond-pulsed laser irradiation and then used as anodes for lithium-ion batteries. The size of the silicon micropillars is manipulated by using different slurry layer thicknesses ranging from a few microns to tens of microns. The effects of the pillar size on electrochemical properties are thoroughly investigated. The smaller the pillars, the better the electrochemical performance. A capacity of 1647 mAh g-1 at 0.1 C current rate is achieved in the anode with the smallest pillars, with 1215, 892, and 582 mAh g-1 at 0.2, 0.5, and 1.0 C, respectively. Although a significant difference in discharge capacity is observed in the early period of cycling among micropillars of different sizes, this discrepancy becomes smaller as a function of the cycle number. Morphological studies reveal that the expansion of micropillars occurred during long-term cycling, which finally led to the formation of island-like structures. Also, the formation of a solid electrolyte interphase film obstructs Li+ diffusion into Si for lithiation, resulting in capacity decay. This study demonstrates the importance of minimizing the pillar size and optimizing the pillar density during anode fabrication.
KW - Anode
KW - Lithium-ion batteries
KW - Microstructure
KW - Selective laser melting
KW - Silicon micropillars
UR - http://www.scopus.com/inward/record.url?scp=85072276716&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072276716&partnerID=8YFLogxK
U2 - 10.3390/app9173623
DO - 10.3390/app9173623
M3 - Article
AN - SCOPUS:85072276716
VL - 9
JO - Applied Sciences (Switzerland)
JF - Applied Sciences (Switzerland)
SN - 2076-3417
IS - 17
M1 - 3623
ER -