Electrochemical improvement of low-temperature petroleum cokes by chemical oxidation with H2O2 for their use as anodes in lithium ion batteries
Electrochemical improvement of low-temperature petroleum cokes by chemical oxidation with H2O2 for their use as anodes in lithium ion batteries
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DOI：
10.1016/j.electacta.2006.07.029
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发表时间：
2006-11
影响因子：
6.6
通讯作者：
A. Concheso;R. Santamaría;R. Menéndez;J. Jiménez-Mateos;R. Alcántara;P. Lavela;J. Tirado
中科院分区：
文献类型：
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作者：
A. Concheso;R. Santamaría;R. Menéndez;J. Jiménez-Mateos;R. Alcántara;P. Lavela;J. Tirado
用过氧化氢对非石墨化石油焦进行轻度氧化，改善了其电化学性能，这是首次在这些材料中使用这种方法。为此，测试了不同的碳化温度和h2o2处理。对于低硫含量焦炭，水氧化处理在第一次循环中显著提高了372mAh/g以上的容量值。相比之下，含硫量约为5%的焦炭并没有显示出真正的改善。前一种结果被解释为粒子表面的有效氧化，去除了无组织的碳，锂可以不可逆地被捕获。此外，阻抗谱分析表明，在锂的首次放电过程中，会形成一个稳定且电阻较小的钝化层。因此，化学过程作为温和氧化，为无序碳作为锂离子电池负极材料的改进开辟了一个有趣的研究领域。
The electrochemical performance of non-graphitized petroleum cokes has been improved by mild oxidation using hydrogen peroxide, a procedure used for the first time in these materials. For this purpose, various carbonisation temperatures and H2O2treatments were tested. For low sulfur content cokes, the aqueous oxidative treatment significantly increases the capacity values above 372mAh/g during the first cycles. In contrast, cokes with a sulfur content of ca. 5%, did not shown a real improvement. The former results have been interpreted in terms of an effective oxidation of the particles surface, which removes unorganized carbon, where lithium can be irreversibly trapped. Moreover, a stable and less resistive passivating layer grows during the first discharge of lithium, as revealed by impedance spectroscopy. Therefore, chemical procedures, as mild oxidation, open an interesting field of research for the improvement of disordered carbons as anode materials in lithium ion batteries.