TY - JOUR
T1 - A-few-second synthesis of silicon nanoparticles by gas-evaporation and their self-supporting electrodes based on carbon nanotube matrix for lithium secondary battery anodes
AU - Kowase, Takayuki
AU - Hori, Keisuke
AU - Hasegawa, Kei
AU - Momma, Toshiyuki
AU - Noda, Suguru
N1 - Funding Information:
The authors thank Prof. Osaka at Department of Applied Chemistry, Waseda University for the facilities for coin cell fabrication, Mr. Enomoto at Kagami Memorial Research Institute for Materials Science and Technology, Waseda University for the TEM observations, Prof. Kuroda, Prof. Shimojima, Ms. Shoji, and Ms. Uchida at Department of Applied Chemistry, Waseda University for their supports with the BET measurements, and Dr. Sugime at Waseda Institute for Advanced Study, Waseda University for his help in editing this manuscript. This work was supported by Grant-in-Aid for Scientific Research (A) and (S) from Japan Society for the Promotion of Science [grant numbers JP25249111 and JP16H06368]; and ALCA from Japan Science and Technology Agency.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - Rapid gas-evaporation method is proposed and developed, which yields Si nanoparticles (SiNPs) in a few seconds at high yields of 20%–60% from inexpensive and safe bulk Si. Such rapid process is realized by heating the Si source to a temperature ≥2000 °C, much higher than the melting point of Si (1414 °C). The size of SiNPs is controlled at tens to hundreds nanometers simply by the Ar gas pressure during the evaporation process. Self-supporting films are fabricated simply by co-dispersion and filtration of the SiNPs and carbon nanotubes (CNTs) without using binders nor metal foils. The half-cell tests showed the improved performances of the SiNP-CNT composite films as anode when coated with graphitic carbon layer. Their performances are evaluated with various SiNP sizes and Si/CNT ratios systematically. The SiNP-CNT film with a Si/CNT mass ratio of 4 realizes the balanced film-based capacities of 618 mAh/gfilm, 230 mAh/cm3, and 0.644 mAh/cm2 with a moderate Si-based performance of 863 mAh/gSi at the 100th cycle.
AB - Rapid gas-evaporation method is proposed and developed, which yields Si nanoparticles (SiNPs) in a few seconds at high yields of 20%–60% from inexpensive and safe bulk Si. Such rapid process is realized by heating the Si source to a temperature ≥2000 °C, much higher than the melting point of Si (1414 °C). The size of SiNPs is controlled at tens to hundreds nanometers simply by the Ar gas pressure during the evaporation process. Self-supporting films are fabricated simply by co-dispersion and filtration of the SiNPs and carbon nanotubes (CNTs) without using binders nor metal foils. The half-cell tests showed the improved performances of the SiNP-CNT composite films as anode when coated with graphitic carbon layer. Their performances are evaluated with various SiNP sizes and Si/CNT ratios systematically. The SiNP-CNT film with a Si/CNT mass ratio of 4 realizes the balanced film-based capacities of 618 mAh/gfilm, 230 mAh/cm3, and 0.644 mAh/cm2 with a moderate Si-based performance of 863 mAh/gSi at the 100th cycle.
KW - Carbon nanotubes
KW - Composite
KW - Lithium secondary batteries
KW - Rapid gas-evaporation
KW - Self-supporting anodes
KW - Silicon nanoparticles
UR - http://www.scopus.com/inward/record.url?scp=85026730721&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85026730721&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2017.07.115
DO - 10.1016/j.jpowsour.2017.07.115
M3 - Article
AN - SCOPUS:85026730721
SN - 0378-7753
VL - 363
SP - 450
EP - 459
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -
