Cation-Exchange-Induced Metal and Alloy Dual-Exsolution in Perovskite Ferrite Oxides Boosting the Performance of Li-O2 Battery
Cation-Exchange-Induced Metal and Alloy Dual-Exsolution in Perovskite Ferrite Oxides Boosting the Performance of Li-O2 Battery
复制标题
钙钛矿铁氧体氧化物中阳离子交换诱导的金属和合金双溶出可提高 Li-O-2 电池的性能
DOI：
10.1002/anie.202110116
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发表时间：
2021-10-18
影响因子：
16.6
通讯作者：
Feng, Shouhua
中科院分区：
文献类型：
--
作者：
Cong, Yingge;Geng, Zhibin;Feng, Shouhua
采用温度控制的阳离子交换方法在钙钛矿型La0.8Fe0.9Co0.1O3-delta中实现了独特的双出溶，其中CoFe合金和Co金属同时从母体钙钛矿中出溶，形成合金和金属共修饰的钙钛矿氧化物。穆斯堡尔谱表明，CoFe合金中Fe原子与钙钛矿中Co阳离子的交换是Co金属与CoFe合金共存的关键。所得复合材料作为Li-O-2电池阴极催化剂表现出更高的催化活性，放电比容量为6549.7mAh g（-1），循环性能为215次循环而没有明显的降解。计算结果表明，修饰后的CoFe合金与金属Co的结合协同调节了Li-O-2电池的放电反应路径，提高了电池的性能。
A temperature-controlled cation-exchange approach is introduced to achieve a unique dual-exsolution in perovskite La0.8Fe0.9Co0.1O3-delta where both CoFe alloy and Co metal are simultaneously exsolved from the parent perovskite, forming an alloy and metal co-decorated perovskite oxide. Mossbauer spectra show that cation exchange of Fe atoms in CoFe alloy and Co cations in the perovskite is the key to the co-existence of Co metal and CoFe alloy. The obtained composite exhibits an enhanced catalytic activity as Li-O-2 battery cathode catalysts with a specific discharge capacity of 6549.7 mAh g(-1) and a cycling performance of 215 cycles without noticeable degradation. Calculations show that the combination of decorated CoFe alloy and Co metal synergistically modulated the discharge reaction pathway that improves the performance of Li-O-2 battery.