High-performance Si-Containing anode materials in lithium-ion batteries: A superstructure of Si@Co–NC composite works effectively

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 -