Purification of Spherical Graphite as Anode for Li-Ion Battery: A Comparative Study on the Purifying Approaches

阳极 石墨 电池(电) 材料科学 离子 化学工程 纳米技术 电极 化学 复合材料 工程类 物理 有机化学 功率(物理) 物理化学 量子力学
作者
Trí Thiện Vũ,Duong Duc La,Long Vu Le,Trung Kien Pham,Anh Nguyen,Tran Hung Nguyen,Trung‐Dung Dang,Myoung‐Jin Um,Woojin Chung,Dinh Duc Nguyen
出处
期刊:Micromachines [Multidisciplinary Digital Publishing Institute]
卷期号:15 (7): 827-827 被引量:3
标识
DOI:10.3390/mi15070827
摘要

Graphite is a versatile material used in various fields, particularly in the power source manufacturing industry. Nowadays, graphite holds a unique position in materials for anode electrodes in lithium-ion batteries. With a carbon content of over 99% being a requirement for graphite to serve as an electrode material, the graphite refinement process plays a pivotal role in the research and development of anode materials for lithium-ion batteries. This study used three different processes to purify spherical graphite through wet chemical methods. The spherical graphite after the purification processes was analysed for carbon content by using energy-dispersive X-ray (EDX) spectroscopy and was evaluated for structural and morphological characteristics through X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) analyses. The analyses results indicate that the three-step process via H2SO4–NaOH–HCl cleaning can elevate the carbon content from 90% to above 99.9% while still maintaining the graphite structure and spherical morphology, thus enhancing the surface area of the material for anode application. Furthermore, the spherical graphite was studied for electrochemical properties when used as an anode for Li-ion batteries using cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) measurements. The results demonstrated that the purification process significantly improves the material’s capacity with a specific capacity of 350 mAh/g compared to the 280 mAh/g capacity of the anode made of spherical graphite without purification.
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