Investigation of the Reversible Intercalation/Deintercalation of Al into the Novel Li3VO4@C Microsphere Composite Cathode Material for Aluminum-Ion Batteries
Investigation of the Reversible Intercalation/Deintercalation of Al into the Novel Li3VO4@C Microsphere Composite Cathode Material for Aluminum-Ion Batteries
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DOI：
10.1021/acsami.7b07503
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发表时间：
2017-08-30
影响因子：
9.5
通讯作者：
Zhao, Jinbao
中科院分区：
文献类型：
--
作者：
Jiang, Jiali;Li, He;Zhao, Jinbao
首次报道了Li3VO4@C微球复合材料作为可充电铝离子电池（AIB）的新型阴极材料，其表现出137 mAh g（-1）的初始放电容量，并且在100次循环后保持在48 mAh g（-1），库仑效率几乎为100%。采用非原位X射线衍射（XRD）、X射线光电子能谱（XPS）和离子液体电解质在不同充放电状态下的核磁共振铝谱（Al-27 NMR）研究了Al嵌入正交晶系Li3VO4@C电极的详细机理.第一性原理计算也进行了调查的结构变化作为Al插入到框架的Li 3VO 4。结果表明，Al/Li3VO4@C电池在阳极经历了金属铝的电化学溶解和沉积过程，同时也经历了Al 3+阳离子在阴极的插入和脱嵌过程。本工作制备的可充电AIB具有低成本、高安全性等特点，为基于酸性离子液体电解质体系的新型正极材料的开发提供了一个新的思路。
The Li3VO4@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(-1) and and remains at 48 mAh g(-1) after 100 cycles with almost 100% Coulombic efficiency. The detailed intercalation mechanism of Al into the orthorhombic Li3VO4 is investigated by ex situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) of Li3VO4@C electrodes and the nuclear magnetic resonance aluminum spectroscopy (Al-27 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 Li3VO4. It is revealed that the Al/Li3VO4@C battery goes through electrochemical dissolution and deposition of metallic aluminum in the anode, as well as the insertion and deinsertion of Al3+ 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.