Development and Characterization of an Electrically Rechargeable Zinc-Air Battery Stack
Development and Characterization of an Electrically Rechargeable Zinc-Air Battery Stack
复制标题
可充电锌空气电池组的开发和表征
DOI：
10.3390/en7106549
复制
发表时间：
2014-10-01
期刊：
影响因子：
3.2
通讯作者：
Hong, Weichen
中科院分区：
文献类型：
--
作者：
Ma, Hongyun;Wang, Baoguo;Hong, Weichen
设计了一种由三个单电池串联组成的可充电锌空气电池堆，采用了一种新型结构的双极板。α-MnO 2和LaNiO 3分别作为氧还原反应（ORR）和析氧反应（OER）的催化剂。在恒定的充电-放电（C-D）电流密度下测量阳极和阴极极化以及单个电池电压，表明每个单个电池的电压分布均匀。对电池组进行了100次C-D循环。结果表明，在15 mA·cm −2充电和25 mA·cm −2放电的初始10次循环中，平均C-D电压间隙约为0.94 V，平均能量效率达到89.28%。在100次C-D循环中充电电压的总增加为~1.56%，证明了优异的稳定性性能。通过恒电流电化学阻抗谱分析了电池性能的退化。100次循环后，ORR的电荷转移电阻从1.57 Ω增加到2.21 Ω，Zn/Zn 2+反应的电荷转移电阻从0.21 Ω增加到0.34 Ω。定量分析指导了正负电极优化的潜力，以提高电池堆的循环寿命。
An electrically rechargeable zinc-air battery stack consisting of three single cells in series was designed using a novel structured bipolar plate with air-breathing holes. Alpha-MnO 2 and LaNiO 3 severed as the catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The anodic and cathodic polarization and individual cell voltages were measured at constant charge-discharge (C-D) current densities indicating a uniform voltage profile for each single cell. One hundred C-D cycles were carried out for the stack. The results showed that, over the initial 10 cycles, the average C-D voltage gap was about 0.94 V and the average energy efficiency reached 89.28% with current density charging at 15 mA·cm −2 and discharging at 25 mA·cm −2 . The total increase in charging voltage over the 100 C-D cycles was ~1.56% demonstrating excellent stability performance. The stack performance degradation was analyzed by galvanostatic electrochemical impedance spectroscopy. The charge transfer resistance of ORR increased from 1.57 to 2.21 Ω and that of Zn/Zn 2+ reaction increased from 0.21 to 0.34 Ω after 100 C-D cycles. The quantitative analysis guided the potential for the optimization of both positive and negative electrodes to improve the cycle life of the cell stack.