TY - JOUR
T1 - Enhanced Capacity and Cyclability of Si@NiSi2 Nanocomposite Anodes Fabricated by Facile Electroless Ni Plating
AU - Wu, Chia Chun
AU - Brahma, Sanjaya
AU - Liu, Chuan Pu
N1 - Funding Information:
This work was financially supported by the Hierarchical Green-Energy Materials (Hi-GEM) Research Center from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and the Ministry of Science and Technology (MOST 110-2221-E-006-117-MY3 and MOST 110-2221-E-006-116-MY3) in Taiwan.
Publisher Copyright:
© 2022 American Chemical Society.
PY - 2023/1/12
Y1 - 2023/1/12
N2 - Although silicon (Si) has been proposed as the most promising anode material in lithium-ion batteries due to their high capacity (∼4000 mA h g-1), the poor cyclability resulting from the strain-induced pulverization caused by the severe volume change during charge/discharge hinders the industrial applications. Here, Si nanoparticles were conformally coated with either Ni, NiO, or NiSi2 to suppress the tremendous volume change of Si, hence leading to prolonging the cycle life of the Si anode to a different degree. Both Si@Ni and Si@NiO nanocomposites were synthesized by one-step self-reducing (SR) electroless nickel plating without/with heat treatment, respectively, whereas Si@NiSi2 nanocomposites were obtained by a two-step (SR + electroless nickel deposition, EN) process, followed by heat treatment. Among all these three nanocomposite anodes, Si@NiSi2 prepared by 5 min of SR, 30 min of EN, and 400 °C annealing in sequence achieved the highest capacity of ∼1390 mA h g-1 and the best capacity retention of ∼86.6% with a Coulombic efficiency of 99% over 70 cycles. For comparison, the capacity retention of the Si@Ni and Si@NiO electrode over 70 cycles is estimated to be ∼67 and 75%, respectively. These results suggest that NiSi2 could be a promising protective coating layer to effectively buffer the volume change of Si and promote the battery life.
AB - Although silicon (Si) has been proposed as the most promising anode material in lithium-ion batteries due to their high capacity (∼4000 mA h g-1), the poor cyclability resulting from the strain-induced pulverization caused by the severe volume change during charge/discharge hinders the industrial applications. Here, Si nanoparticles were conformally coated with either Ni, NiO, or NiSi2 to suppress the tremendous volume change of Si, hence leading to prolonging the cycle life of the Si anode to a different degree. Both Si@Ni and Si@NiO nanocomposites were synthesized by one-step self-reducing (SR) electroless nickel plating without/with heat treatment, respectively, whereas Si@NiSi2 nanocomposites were obtained by a two-step (SR + electroless nickel deposition, EN) process, followed by heat treatment. Among all these three nanocomposite anodes, Si@NiSi2 prepared by 5 min of SR, 30 min of EN, and 400 °C annealing in sequence achieved the highest capacity of ∼1390 mA h g-1 and the best capacity retention of ∼86.6% with a Coulombic efficiency of 99% over 70 cycles. For comparison, the capacity retention of the Si@Ni and Si@NiO electrode over 70 cycles is estimated to be ∼67 and 75%, respectively. These results suggest that NiSi2 could be a promising protective coating layer to effectively buffer the volume change of Si and promote the battery life.
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U2 - 10.1021/acs.jpcc.2c08240
DO - 10.1021/acs.jpcc.2c08240
M3 - Article
AN - SCOPUS:85145477143
SN - 1932-7447
VL - 127
SP - 169
EP - 176
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 1
ER -