Facile synthesis of nano-Si/graphite composites from rice husk for high performance lithium-ion battery anodes

Q1 Environmental Science
Crystina Simanjuntak , Sabarmin Perangin-angin , Amru Daulay , Suci Aisyah Amaturrahim , Indah Revita Saragi , Dilshad Hussain , Arwadi Sinuraya
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Abstract

The hydrothermal method is used to attach nano-Si to the surface of natural graphite to make a high-performance nano-si/graphite (nSi/G) composite. The nSi/G composites have been successfully made from rice husk using the hydrothermal method. The characterizations used XRD, XPS, SEM, TEM, and electrochemical measurements. The results of XRD showed that nano-Si shows 2θ at 28°, 47°, 56°, 69°, and 76° is the diffraction pattern of silica and carbon, respectively. XPS spectrum at nano-Si showed a spectrum at a binding energy of 97.6 eV and 101.2 eV, indicating Si–Si and Si–OH. SEM images on nano-Si show a spherical shape; graphite contains flakes, whereas nano-Si includes every flake on the graphite. The TEM images of the nano-Si particles were around 30–50 nm in diameter and aggregated due to the high surface energy. This composite is used in lithium-ion batteries. This component structure is good for improving the ability to store Li+ because the amorphous graphite layer surrounding the nano-Si has good electric conductivity and strong elasticity to help relax the strain caused by the electrochemical reaction of the Si during cycles. The specific capacity of the nSi/G composite is 3219 mAhg−1, and after 200 cycles, it still has 98.36 % of its initial capacity. The electrochemical results indicate that Si–graphite composites derived from rice husks are viable candidates for high-capacity lithium-ion battery anodes, offering significant battery performance and scalability advantages.

Abstract Image

用稻壳制备高性能锂离子电池负极用纳米硅/石墨复合材料
采用水热法将纳米硅附着在天然石墨表面,制备高性能纳米硅/石墨(nSi/G)复合材料。以稻壳为原料,采用水热法制备了nSi/G复合材料。表征采用XRD, XPS, SEM, TEM和电化学测量。XRD结果表明,纳米si在28°、47°、56°、69°和76°处分别为二氧化硅和碳的2θ衍射图样。纳米si的XPS光谱显示结合能分别为97.6 eV和101.2 eV,为Si-Si和Si-OH。纳米硅表面的SEM图像呈球形;石墨包含薄片,而纳米硅包含石墨上的每个薄片。TEM图像显示,纳米si颗粒的直径约为30 ~ 50 nm,由于表面能高而聚集。这种复合材料用于锂离子电池。这种组件结构有利于提高Li+的存储能力,因为纳米Si周围的非晶石墨层具有良好的导电性和较强的弹性,有助于缓解循环过程中Si的电化学反应所产生的应变。nSi/G复合材料的比容量为3219 mAhg−1,经过200次循环后,其比容量仍为初始容量的98.36%。电化学结果表明,从稻壳中提取的硅石墨复合材料是高容量锂离子电池阳极的可行候选材料,具有显著的电池性能和可扩展性优势。
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来源期刊
Case Studies in Chemical and Environmental Engineering
Case Studies in Chemical and Environmental Engineering Engineering-Engineering (miscellaneous)
CiteScore
9.20
自引率
0.00%
发文量
103
审稿时长
40 days
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