Voltage Gain in Lithiated Enolate-Based Organic Cathode Materials by Isomeric Effect
Voltage Gain in Lithiated Enolate-Based Organic Cathode Materials by Isomeric Effect
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DOI：
10.1021/am405470p
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发表时间：
2014-07-23
影响因子：
9.5
通讯作者：
Poizot, Philippe
中科院分区：
文献类型：
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作者：
Gottis, Sebastien;Barres, Anne-Lise;Poizot, Philippe
锂离子电池（LIB）现在作为旗舰技术出现，能够为越来越多的应用提供动力，从小型便携式电子设备到先进的电动汽车。在过去的二十年中，新的金属基主体结构的发现，以及实质性的技术发展，大大提高了它们的电化学性能，特别是在能量密度方面。为了进一步促进电化学存储系统，同时限制对金属基原材料的需求，一个可能的无机基电池的平行研究包括开发高效和低污染的有机电极材料。长期以来，这类氧化还原活性材料主要由于稳定性问题而被忽视，但近年来，已经取得了进展，证明有机物可替代地表现出相当大的资产。在我们正在进行的旨在阐述锂化有机阴极材料的研究的基础上，我们在本文中报告了一种化学方法，该方法利用了二羟基对苯二甲酰基系统中从帕拉切换到邻位时的正电位偏移。在实践中，首先通过基于CO2封存的生态友好合成方案生产（2，3-二氧硫鎓）-对苯二甲酸二锂化合物（Li 4C 8H 2 O 6），然后表征，最后作为锂化阴极材料与Li进行电化学测试。这种新的有机盐显示出有前景的电化学性能，特别是快速动力学、良好的循环稳定性和最重要的是相对于Li+/Li-0为2.85 V的平均操作电位（即，+300 mV），验证了以下策略的相关性。
Li-ion batteries (LIBs) appear nowadays as flagship technology able to power an increasing range of applications starting from small portable electronic devices to advanced electric vehicles. Over the past two decades, the discoveries of new metal-based host structures, together with substantial technical developments, have considerably improved their electrochemical performance, particularly in terms of energy density. To further promote electrochemical storage systems while limiting the demand on metal-based raw materials, a possible parallel research to inorganic-based batteries consists in developing efficient and low-polluting organic electrode materials. For a long time, this class of redox-active materials has been disregarded mainly due to stability issues but, in recent years, progress has been made demonstrating that organics undeniably exhibit considerable assets. On the basis of our ongoing research aiming at elaborating lithiated organic cathode materials, we report herein on a chemical approach that takes advantage of the positive potential shift when switching from para to ortho-position in the dihydroxyterephthaloyl system. In practice, dilithium (2,3-dilithium-oxy)-terephthalate compound (Li4C8H2O6) was first produced through an eco-friendly synthesis scheme based on CO2 sequestration, then characterized, and finally tested electrochemically as lithiated cathode material vs. Li. This new organic salt shows promising electrochemical performance, notably fast kinetics, good cycling stability and above all an average operating potential of 2.85 V vs. Li+/Li-0 (i.e., +300 mV in comparison with its para-regioisomer), verifying the relevance of the followed strategy.