薄膜铝空气电池阴极复合催化剂性能研究

Investigation of composite catalyst of cathode for thin film aluminum air battery

采用棒状alpha-MnO2作为阴极主催化剂,并掺杂La2O3和CeO2制成复合型催化剂,使用1 mm厚碱性凝胶聚合物电解质膜,组装成薄膜聚合物电解质铝空气电池。在0.5×10–3 A·cm–2电流密度下恒流放电考察不同阴极催化剂的性能,Mn-La和Mn-Ce型电化学性能均低于Mn-La-Ce型催化剂。随后的实验中,分别测试了薄膜铝空气电池在0.8×10–3和1.1×10–3 A·cm–2电流密度下的放电性能,并在1.1×10–3 A·cm–2电流密度下得到其容量密度为8.91×10–3 Ah·cm–2,能量密度为11.46×10–3 Wh·cm–2,以及功率密度为1.42×10–3 W·cm–2。

Alpha-MnO2 doped with La203 and CeO2 as a composite catalyst was designed and fabricated for aluminum air battery with the film alkaline gel polymer electrolyte thin to 1 rnm. In discharge test, the electrochemical properties of Mn-La and Mn-Ce are not as good as Mn-La-Ce catalyst at the current density of 0.5×10-3A · cm-2. In the subsequent experiment, discharge performance of the thin film aluminum air battery with the composite catalyst is investigated under the current density of 0.8 × 10-3 and 1.1 × 10-3 A · cm-2, which exhibites discharge capacity of 8.91 × 10-3 Wh · cm-2, energy density of 11.46 × 10-3 Wh · cm-2 and power density of 1.42 × 10-3 Wh · cm-2 at the current density of 1.1 ×10-3 A· cm-2.