State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University , No. 422 Siming South Road, Xiamen, Fujian 361005, China.
ACS Appl Mater Interfaces. 2017 Aug 30;9(34):28486-28494. doi: 10.1021/acsami.7b07503. Epub 2017 Aug 15.
The LiVO@C microsphere composite was first reported as a novel cathode material for rechargeable aluminum-ion batteries (AIBs), which manifests the initial discharge capacity of 137 mAh g and and remains at 48 mAh g after 100 cycles with almost 100% Coulombic efficiency. The detailed intercalation mechanism of Al into the orthorhombic LiVO is investigated by ex situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) of LiVO@C electrodes and the nuclear magnetic resonance aluminum spectroscopy (Al NMR) of ionic liquid electrolytes in different discharge/charge states. First-principle calculations are also carried out to investigate the structural change as Al inserts into the framework of LiVO. It is revealed that the Al/LiVO@C battery goes through electrochemical dissolution and deposition of metallic aluminum in the anode, as well as the insertion and deinsertion of Al cations in the cathode in the meantime. The rechargeable AIBs fabricated in this work are of low cost and high safety, which may make a step forward in the development of novel cathode materials based on the acidic ionic liquid electrolyte system.
LiVO@C 微球复合材料首次被报道为一种用于可充铝离子电池 (AIBs) 的新型阴极材料，其初始放电容量为 137 mAh g，经过 100 次循环后仍保持在 48 mAh g，库仑效率几乎达到 100%。通过对 LiVO@C 电极的原位 X 射线衍射 (XRD) 和 X 射线光电子能谱 (XPS) 以及不同放电/充电状态下离子液体电解质的核磁共振铝谱 (Al NMR) 的研究，详细探讨了 Al 嵌入正交 LiVO 的嵌入机制。还进行了第一性原理计算，以研究 Al 插入 LiVO 骨架时的结构变化。结果表明，Al/LiVO@C 电池在阳极经历了金属铝的电化学溶解和沉积，同时在阴极经历了 Al 阳离子的嵌入和脱嵌。本工作中制备的可充电 AIBs 成本低、安全性高，可能为基于酸性离子液体电解质体系的新型阴极材料的发展迈出了一步。
