Influence of the Temperature of the Heat Treatment in a Nitrogen Atmosphere on the Physicochemical and Electrochemical Properties of Petroleum Coke

IF 0.6 4区化学 Q4 CHEMISTRY, APPLIED Russian Journal of Applied Chemistry Pub Date : 2024-04-23 DOI:10.1134/s1070427223080086

N. V. Egorova, R. R. Nasyrova, B. Yu. Mishinkin, Yu. S. Zimin, E. V. Kuz’mina, V. S. Kolosnitsyn

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Abstract

Studies aimed at the development of cheap, safe, and effective carbon materials based on domestic resources for negative electrodes of lithium-ion and post-lithium-ion batteries are topical and have high practical significance. The paper summarizes the results of studying how the temperature of the heat treatment of petroleum coke in a nitrogen flow influences its physicochemical and electrochemical properties. Petroleum coke was kept for 5 h in a nitrogen flow at fixed temperatures of 450, 600, 800, 1000, and 1200°C. Heat treatment of petroleum coke leads to a significant decrease in the specific resistivity (from 4.8 × 10⁷ to 1 × 10^–2 Ω cm), to an increase in the specific surface area, and to a decrease in the pycnometric density (the temperature of 1200°C is an exception). Petroleum coke that has not been heat-treated or has been heat-treated at 450 °С exhibits no electrochemical activity. The carbon electrodes made of petroleum coke heat-treated at 600°C in a nitrogen atmosphere exhibit the maximal anodic capacity for lithium (340–350 mA h/g). However, carbon electrodes based on petroleum coke heat-treated at 600°С exhibit short cyclic duration and high irreversible capacity (58–60%). An increase in the petroleum coke heat treatment temperature to 1200°С leads to a decrease in the irreversible capacity to 40% and in the reversible anodic capacity to 220 mA h/g and to an increase in the cycling duration of the carbon electrodes. The petroleum coke heat-treated un a nitrogen atmosphere at 1000°C is the most promising material for negative electrodes of lithium-ion batteries from the viewpoint of the set of physicochemical and electrochemical properties.

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氮气环境下的热处理温度对石油焦物理化学和电化学性质的影响

摘要研究开发基于国内资源的廉价、安全、有效的碳材料，用于锂离子电池和后锂离子电池的负极是当前的热点问题，具有很高的现实意义。本文总结了在氮气流中热处理石油焦的温度如何影响其物理化学和电化学特性的研究结果。石油焦在固定温度为 450、600、800、1000 和 1200°C 的氮气流中保持 5 小时。对石油焦进行热处理后，比电阻率显著降低（从 4.8 × 107 降至 1 × 10-2 Ω cm），比表面积增加，焦密度降低（1200°C 的温度除外）。未经热处理或在 450 °С 温度下热处理的石油焦没有电化学活性。由石油焦制成的碳电极在氮气环境中于 600 ℃ 下进行热处理，可显示出最大的锂阳极容量（340-350 mA h/g）。然而，在 600°С 温度下加热处理的石油焦碳电极循环持续时间短，不可逆容量高（58%-60%）。将石油焦热处理温度提高到 1200°С 后，碳电极的不可逆容量降低到 40%，可逆阳极容量降低到 220 mA h/g，循环持续时间也延长了。从物理化学和电化学性质的角度来看，在 1000°C 氮气环境下加热处理的石油焦是最有希望用于锂离子电池负极的材料。

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来源期刊

Russian Journal of Applied Chemistry 化学-应用化学

CiteScore

1.60

自引率

11.10%

发文量

审稿时长

2-4 weeks

期刊介绍： Russian Journal of Applied Chemistry (Zhurnal prikladnoi khimii) was founded in 1928. It covers all application problems of modern chemistry, including the structure of inorganic and organic compounds, kinetics and mechanisms of chemical reactions, problems of chemical processes and apparatus, borderline problems of chemistry, and applied research.