法拉第效率
材料科学
阳极
硅
锂(药物)
储能
纳米复合材料
化学工程
纳米颗粒
纳米技术
电极
光电子学
化学
功率(物理)
医学
物理
工程类
物理化学
量子力学
内分泌学
作者
Kelvin Jenerali Nyamtara,Jong Kwon Song,Neema Cyril Karima,Sung Hoon Kim,Manh Cuong Nguyen,Thi Phuong Mai Duong,Kyung Jin Lee,Wook Ahn
标识
DOI:10.1016/j.jallcom.2023.173229
摘要
Energy storage devices have become the dominant power source in various fields due to their capacity, lifespan, and eco-friendliness. However, there is a need to develop new energy storage devices with higher energy and power density to meet increasing energy demands. Silicon-based anode materials have considerable potential for developing long-lasting, high-capacity energy storage devices, specifically lithium-ion batteries. However, the practical use of these batteries faces challenges like significant volume variations, silicon instability during charging and discharging, and restricted conductivity. This work used silicon nanoparticles from waste industrial solar cells and mixed them with pitch derived from coal tar in a tetrahydrofuran (THF) solvent to form a homogenous Si@Pitch nanocomposite. Pitch-derived carbon helps hold the silicon particles together, reducing the detrimental effects of volume expansion. It acts as a matrix that accommodates the structural changes in silicon during lithiation and delithiation. The Pyrolyzed Si@Pitch-2:1 nanocomposite electrode developed through an efficient two-step pyrolysis technique demonstrated outstanding performance. When charged at a rate of 500 mA·g-1 over 200 cycles, it showed a high discharge capacity of 1524 mAh·g-1, with an average coulombic efficiency of 99.8% and a discharge capacity retention of 75.7%. Combining silicon nanoparticles and pitch derived from recycled industrial waste contributes to the impressive results. This efficient synthesis method can improve the anode materials used in lithium-ion batteries.
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