An Aqueous Ca‐Ion Battery,Advanced Science

当前位置： X-MOL 学术 › Adv. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

An Aqueous Ca‐Ion Battery
Advanced Science ( IF 14.3 ) Pub Date : 2017-10-26 , DOI: 10.1002/advs.201700465
Saman Gheytani ₁ , Yanliang Liang ₁ , Feilong Wu ₂ , Yan Jing ₁ , Hui Dong ₁ , Karun K. Rao ₃ , Xiaowei Chi ₁ , Fang Fang ₂ , Yan Yao _{1,

4}

Affiliation

Multivalent‐ion batteries are emerging as low‐cost, high energy density, and safe alternatives to Li‐ion batteries but are challenged by slow cation diffusion in electrode materials due to the high polarization strength of Mg‐ and Al‐ions. In contrast, Ca‐ion has a low polarization strength similar to that of Li‐ion, therefore a Ca‐ion battery will share the advantages while avoiding the kinetics issues related to multivalent batteries. However, there is no battery known that utilizes the Ca‐ion chemistry due to the limited success in Ca‐ion storage materials. Here, a safe and low‐cost aqueous Ca‐ion battery based on a highly reversible polyimide anode and a high‐potential open framework copper hexacyanoferrate cathode is demonstrated. The prototype cell shows a stable capacity and high efficiency at both high and low current rates, with an 88% capacity retention and an average 99% coloumbic efficiency after cycling at 10C for 1000 cycles. The Ca‐ion storage mechanism for both electrodes as well as the origin of the fast kinetics have been investigated. Additional comparison with a Mg‐ion cell with identical electrodes reveals clear kinetics advantages for the Ca‐ion system, which is explained by the smaller ionic radii and more facile desolvation of hydrated Ca‐ions.

中文翻译：

水性钙离子电池

多价离子电池正在成为低成本，高能量密度和锂离子电池的安全替代品，但由于Mg和Al离子的高极化强度，使电极材料中的阳离子扩散缓慢受到了挑战。相比之下，Ca-ion具有与Li-ion相似的低极化强度，因此Ca-ion电池将共享优势，同时避免了与多价电池相关的动力学问题。但是，由于在钙离子存储材料方面取得的成功有限，因此尚无使用钙离子化学物质的电池。在此，展示了一种基于低成本可逆聚酰亚胺阳极和高电势开放框架六氰合铁酸铜阴极的安全低成本Ca-离子水性电池。原型电池在高电流和低电流下均显示出稳定的容量和高效率，在10°C循环1000次后，具有88％的容量保持率和99％的平均团簇效率。研究了两个电极的Ca离子存储机理以及快速动力学的起源。与具有相同电极的Mg离子电池进行的其他比较表明，Ca-离子系统具有明显的动力学优势，这可以通过较小的离子半径和更便捷的水合Ca-离子去溶剂化来解释。

更新日期：2017-10-26

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11