Modification of Petroleum Coke for Lithium-Ion Batteries by Heat-Treatment with Iron Oxide
Modification of Petroleum Coke for Lithium-Ion Batteries by Heat-Treatment with Iron Oxide
复制标题
氧化铁热处理对锂离子电池用石油焦的改性
DOI：
10.1149/1.1814031
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发表时间：
2004
影响因子：
3.9
通讯作者：
J. Mateos
中科院分区：
文献类型：
--
作者：
R. Alcántara;P. Lavela;G. Ortiz;J. Tirado;R. Stoyanova;E. Zhecheva;J. Mateos
在800、850和900°C下，在Fe 2 O3存在下对石油焦进行热处理，并在锂测试电池中评估所得混合物作为活性电极材料的行为。X射线衍射分析和扫描电子显微镜显示，铁氧化物被还原，碳纹理被修改加热的碳/铁氧化物的混合物。对于含铁的碳基电极，观察到容量保持率的显著改善。这些变化已经被解释为在退火过程中与氧化铁的碳表面的改性，并通过在与锂的电化学反应过程中通过还原氧化铁形成无定形保护层。电子顺磁共振揭示了参与可逆的氧化还原过程中的铁。交流阻抗谱表明含铁碳基电极具有更好的稳定性。
Petroleum coke has been heat-treated in the presence of Fe 2 O 3 at 800, 850, and 900°C, and the behavior of the resulting mixture as active electrode material has been evaluated in lithium test cells. X-ray diffraction analysis and scanning electron microscopy revealed that iron oxide was reduced and the carbon texture was modified on heating the carbon/iron oxide mixture. A significant improvement of capacity retention was observed for iron-containing carbon-based electrodes. The changes have been explained by the modification of the carbon surface during annealing with iron oxide, and by the formation of an amorphous protective layer through reduction of iron oxide during the electrochemical reaction with lithium. Electron paramagnetic resonance revealed the participation of iron in reversible redox processes. Impedance spectra showed better stability of the iron-containing carbon-based electrodes.