Electrochemical properties of Ca-Pb electrode for calcium-based liquid metal batteries
Electrochemical properties of Ca-Pb electrode for calcium-based liquid metal batteries
复制标题
钙基液态金属电池Ca-Pb电极的电化学性能
DOI：
10.1007/s12613-020-2150-9
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Guoqing Li
中科院分区：
文献类型：
--
作者：
Xiaohui Ning;Chenzheng Liao;Guoqing Li
Ca-Pb电极对被认为是液态金属电池（LMBs）中最便宜的材料之一（约36 $/（kW·h））。Ca-Pb合金在Ca ~（2+）中的电化学性能|氯化锂-氯化钠-氯化钙|本文对铅电池进行了研究。在50-200 mA·cm-2电流密度范围内，电极电位与电流密度呈线性关系，表明Ca与Pb的合金化和脱合金过程在液-电界面上实现了快速的电荷传递和质量传递。Ca-Pb电极的放电电压高达0.6V，自放电电流密度小（98.84%）。事后分析表明，在不同Ca摩尔分数的电极中，金属间化合物CaPb 3和CaPb均匀分布，说明固态金属间化合物的成核并不阻碍Ca在电极中的扩散。对钙铅电极的研究为钙基LMB电极的进一步研究和设计提供了参考。
The Ca-Pb electrode couple is considered to be one of the least expensive (~36 $/(kW·h)) among various optional materials for liquid-metal batteries (LMBs). The electrochemical properties of Ca-Pb alloy in a Ca|LiCl-NaCl-CaCl_2|Pb cell were investigated in this paper. The electrode potential maintained a linear relationship in the current density range of 50-200 mA·cm~(-2), which indicates that the alloying and dealloying processes of Ca with Pb attained rapid charge transfer and mass transport in the interface between the liquid electrode and electrolyte. The Ca -Pb electrode exhibited remarkable properties with a high discharge voltage of 0.6 V, a small self-discharge current density (98.84%). The postmortem analysis showed that intermetallics CaPb3 and CaPb were uniformly distributed in the electrode with different molar fractions of Ca, which indicates that the nucleation of solid intermetallics did not hinder the diffusion of Ca in the electrode. This investigation on Ca-Pb electrode sheds light on the further research and the design of electrodes for Ca-based LMBs.