TY - JOUR
T1 - High-performance Si-Containing anode materials in lithium-ion batteries
T2 - A superstructure of Si@Co–NC composite works effectively
AU - Li, Qiongguang
AU - Wang, Yanhong
AU - Yu, Jing
AU - Yuan, Menglei
AU - Tan, Qiangqiang
AU - Zhong, Ziyi
AU - Su, Fabing
N1 - Publisher Copyright:
© 2020 Institute of Process Engineering, Chinese Academy of Sciences
PY - 2022/2
Y1 - 2022/2
N2 - To mitigate the massive volume expansion of Si-based anode during the charge/discharge cycles, we synthesized a superstructure of Si@Co–NC composite via the carbonization of zeolite imidazolate frameworks incorporated with Si nanoparticles. The Si@Co–NC is comprised of Si-nanoparticle core and N-doped/Co-incorporated carbon shell, and there is void space between the core and the shell. When using as anode material for LIBs, Si@Co–NC displayed a super performance with a charge/discharge capacity of 191.6/191.4 mA h g−1 and a coulombic efficiency of 100.1% at 1000 mA g−1 after 3000 cycles, and the capacity loss rate is 0.022% per cycle only. The excellent electrochemical property of Si@Co–NC is because its electronic conductivity is enhanced by doping the carbon shell with N atoms and by incorporating with Co particles, and the pathway of lithium ions transmission is shortened by the hollow structure and abundant mesopores in the carbon shell. Also, the volume expansion of Si nanoparticles is well accommodated in the void space and suppressed by the carbon host matrix. This work shows that, through designing a superstructure for the anode materials, we can synergistically reduce the work function and introduce the confinement effect, thus significantly enhancing the anode materials' electrochemical performance in LIBs.
AB - To mitigate the massive volume expansion of Si-based anode during the charge/discharge cycles, we synthesized a superstructure of Si@Co–NC composite via the carbonization of zeolite imidazolate frameworks incorporated with Si nanoparticles. The Si@Co–NC is comprised of Si-nanoparticle core and N-doped/Co-incorporated carbon shell, and there is void space between the core and the shell. When using as anode material for LIBs, Si@Co–NC displayed a super performance with a charge/discharge capacity of 191.6/191.4 mA h g−1 and a coulombic efficiency of 100.1% at 1000 mA g−1 after 3000 cycles, and the capacity loss rate is 0.022% per cycle only. The excellent electrochemical property of Si@Co–NC is because its electronic conductivity is enhanced by doping the carbon shell with N atoms and by incorporating with Co particles, and the pathway of lithium ions transmission is shortened by the hollow structure and abundant mesopores in the carbon shell. Also, the volume expansion of Si nanoparticles is well accommodated in the void space and suppressed by the carbon host matrix. This work shows that, through designing a superstructure for the anode materials, we can synergistically reduce the work function and introduce the confinement effect, thus significantly enhancing the anode materials' electrochemical performance in LIBs.
KW - Confinement effect
KW - Doping
KW - Hollow core-shell structure
KW - Si anode
KW - Work function regulation
UR - http://www.scopus.com/inward/record.url?scp=85103297569&partnerID=8YFLogxK
U2 - 10.1016/j.gee.2020.08.007
DO - 10.1016/j.gee.2020.08.007
M3 - 文章
AN - SCOPUS:85103297569
SN - 2096-2797
VL - 7
SP - 116
EP - 129
JO - Green Energy and Environment
JF - Green Energy and Environment
IS - 1
ER -