TY - JOUR

T1 - Combined Fe and Sr refining of Al-Si melt strategy for fabrication of hierarchical structure Si anodes

AU - Ding, Juxuan

AU - Sun, Jifei

AU - Ban, Boyuan

AU - Jiang, Xuesong

AU - Zhu, Xiaoxiao

AU - Mo, Zhangchao

AU - Kratzer, Markus

AU - Teichert, Karl Christian

AU - Chen, Jian

N1 - Publisher Copyright: © 2024 Elsevier B.V.

PY - 2024/4/21

Y1 - 2024/4/21

N2 - Both industrial and academic research societies have considered silicon (Si) as the most promising anode for next-generation lithium-ion batteries (LIBs). However, the huge volume changes of the Si matrix during the cycling processes damage the lifetime of Si anodes. Numerous studies have demonstrated that the structure of the Si matrix is a vital factor affecting the cycling performance of the Si anodes. Herein, we propose a combined modification strategy by adding Sr and Fe into the Al-Si melt for the fabrication of refined hierarchical structure Si (HSSi-SrFe). Under the poisoning effect of Sr and refining effect of Fe, the morphology of the Si matrix was changed from a coarse flaky to a micron-sized hierarchical structure with 1D nano-secondary branches. As a result, the HSSi-SrFe delivers higher tap density, better dispersion and over 10 times conductivity compared with nano-Si. Meanwhile, the HSSi-SrFe@C electrode maintains a reversible capacity of ∼ 1000 mAh g-1 after 1000 cycles, and the LCO || HSSi-SrFe@C full cell shows a 91 % capacity retention after 100 cycles with a high areal capacity. This work exhibits the practicality of the melt modification strategy to scalable production low-cost and high-quality hierarchical structure Si for the application of high energy density LIBs.

AB - Both industrial and academic research societies have considered silicon (Si) as the most promising anode for next-generation lithium-ion batteries (LIBs). However, the huge volume changes of the Si matrix during the cycling processes damage the lifetime of Si anodes. Numerous studies have demonstrated that the structure of the Si matrix is a vital factor affecting the cycling performance of the Si anodes. Herein, we propose a combined modification strategy by adding Sr and Fe into the Al-Si melt for the fabrication of refined hierarchical structure Si (HSSi-SrFe). Under the poisoning effect of Sr and refining effect of Fe, the morphology of the Si matrix was changed from a coarse flaky to a micron-sized hierarchical structure with 1D nano-secondary branches. As a result, the HSSi-SrFe delivers higher tap density, better dispersion and over 10 times conductivity compared with nano-Si. Meanwhile, the HSSi-SrFe@C electrode maintains a reversible capacity of ∼ 1000 mAh g-1 after 1000 cycles, and the LCO || HSSi-SrFe@C full cell shows a 91 % capacity retention after 100 cycles with a high areal capacity. This work exhibits the practicality of the melt modification strategy to scalable production low-cost and high-quality hierarchical structure Si for the application of high energy density LIBs.

KW - 1D nano-structure

KW - Hierarchical structure

KW - Lithium-ion battery

KW - Melt modification

UR - http://www.scopus.com/inward/record.url?scp=85190821205&partnerID=8YFLogxK

U2 - 10.1016/j.cej.2024.151488

DO - 10.1016/j.cej.2024.151488

M3 - Article

AN - SCOPUS:85190821205

VL - 489.2024

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

IS - 1 June

M1 - 151488

ER -