Park Sae Min, Salunkhe Tejaswi Tanaji, Yoo Ji Hyeon, Kim Il Ho, Kim Il Tae
Department of Chemical, Biological and Battery Engineering, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea.
R&D Center, Black Materials Co., Ltd., Hwaseong-si 18255, Gyeonggi-do, Republic of Korea.
Nanomaterials (Basel). 2024 Dec 5;14(23):1953. doi: 10.3390/nano14231953.
To develop an advanced anode for lithium-ion batteries, the electrochemical performance of a novel material comprising a porous artificial carbon (PAC)-Si composite was investigated. To increase the pore size and surface area of the composite, ammonium bicarbonate (ABC) was introduced during high-energy ball-milling, ensuring a uniform distribution of silicon within the PAC matrix. The physical and structural properties of the developed material were evaluated using several advanced techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), and galvanostatic intermittent titration (GITT). Artificial graphite contains several macropores that can accommodate volume hysteresis and provide effective sites for anchoring Si nanoparticles, enabling efficient electrochemical reactions. GITT analysis revealed that the PAC-Si-CB-ABC composite exhibited superior lithium-ion diffusion compared to conventional graphite. The developed PAC(55%)-Si(45%)-CB-ABC electrode with PAA as the binder demonstrated a reversible capacity of 850 mAh g at 100 mA g and a high-rate capability of 600 mAh g at 2000 mA g. A full cell employing the NCM622 cathode exhibited reversible cyclability of 128.9 mAh g with a reasonable energy density of 323.3 Wh kg. These findings suggest that the developed composite is a useful anode system for advanced lithium-ion batteries.
为开发一种先进的锂离子电池阳极，研究了一种包含多孔人造碳（PAC）-硅复合材料的新型材料的电化学性能。为增加复合材料的孔径和表面积，在高能球磨过程中引入了碳酸氢铵（ABC），确保硅在PAC基体中均匀分布。使用包括X射线衍射（XRD）、透射电子显微镜（TEM）和恒电流间歇滴定（GITT）在内的多种先进技术对所开发材料的物理和结构性能进行了评估。人造石墨含有几个大孔，可容纳体积滞后并为锚定硅纳米颗粒提供有效位点，从而实现高效的电化学反应。GITT分析表明，与传统石墨相比，PAC-Si-CB-ABC复合材料表现出优异的锂离子扩散性能。所开发的以聚丙烯酸（PAA）为粘结剂的PAC（55%）-Si（45%）-CB-ABC电极在100 mA g下的可逆容量为850 mAh g，在2000 mA g下的高倍率性能为600 mAh g。采用NCM622正极的全电池表现出128.9 mAh g的可逆循环性能，能量密度为323.3 Wh kg，较为合理。这些发现表明，所开发的复合材料是一种用于先进锂离子电池的有用阳极体系。
