Scalable Synthesis of Pore-Rich Si/C@C Core–Shell-Structured Microspheres for Practical Long-Life Lithium-Ion Battery Anodes

• DOI: 10.1021/acsami.1c22656
• Publication Date: 2022-02-17T14:04:26Z
• Authors: Weili An; Peng He; Zongzhou Che; Chengmao Xiao; Eming Guo; Chunlei Pang; Xueqin He; Jianguo Ren; Guohui Yuan; Ning Du; Deren Yang; Dong-Liang Peng; Qiaobao Zhang
• Keywords: 7. Clean energy; 01 natural sciences; 0104 chemical sciences

Silicon/carbon (Si/C) composites have rightfully earned the attention as anode candidates for high-energy-density lithium-ion batteries (LIBs) owing to their advantageous capacity and superior cycling stability, yet practical application remains a significant challenge. In this study, we report large-scale synthesis of an intriguing micro/nanostructured pore-rich Si/C microsphere consisting Si nanoparticles tightly immobilized onto micron-sized cross-linked C matrix that is coated by thin layer (denoted P-Si/C@C) using low-cost spray-drying approach chemical vapor deposition process with inorganic salts pore-forming agents. The as-obtained P-Si/C@C composite has high porosity provides sufficient inner voids alleviate huge volume expansion Si. outer smooth robust shells strengthen stability entire structure solid-electrolyte interphase. embedded in microsized show excellent electrical conductivity structural stability. By virtue advantages, as-fabricated displays initial Coulombic efficiency 89.8%, reversible 1269.6 mAh g-1 at 100 mA g-1, cycle performance 708.6 87.1% retention after 820 cycles 1000 outperforming reported results anodes. Furthermore, low electrode swelling 18.1% areal 3.8 cm-2 can be obtained. When assembled into 3.2 Ah cylindrical cell, extraordinary long life 81.4% even 1200 1C (3.2 A) rate are achieved, indicating advantages long-life power electric vehicles.