Hefei National Laboratory for Physical Science at Microscale, University of Science & Technology of China, Hefei, 230026, P. R. China.
Dalton Trans. 2011 Oct 28;40(40):10751-7. doi: 10.1039/c1dt10454c. Epub 2011 Sep 23.
Aqueous lithium ion batteries have been widely considered as promising "green" batteries due to several advantages, such as low toxicity, low cost, high safety, as well as high ion conductivity. But unlike the great effort devoted to understanding the lithium insertion/extraction process in non-aqueous lithium ion batteries, the knowledge about this in aqueous electrolytes is still lacking research at present. In this work, taking a new anode material of single-crystalline Ag(2)V(4)O(11) nanobelts as an example, we investigated the charge-discharge reaction mechanism of aqueous lithium ion batteries for the first time. A two-step reaction mechanism was proposed and it was also deduced that crystallinity loss of the electrode materials and partial irreversibility of silver oxidation are the key reasons for rapid capacity fading. We expect this work to provide a scientific platform that could help to investigate and evaluate other electrode materials in this research area.
水系锂离子电池由于其低毒性、低成本、高安全性以及高离子电导率等优点，被广泛认为是有前途的“绿色”电池。但是，与大量致力于理解非水系锂离子电池中锂嵌入/提取过程的努力不同，目前对于水系电解液中这方面的知识仍缺乏研究。在这项工作中，我们以单晶 Ag(2)V(4)O(11)纳米带这种新型阳极材料为例，首次研究了水系锂离子电池的充放电反应机理。提出了两步反应机理，并推断出电极材料结晶度的损失和银氧化的部分不可逆性是容量快速衰减的关键原因。我们希望这项工作为研究和评估该研究领域中其他电极材料提供一个科学平台。
