Cation‐Exchange‐Induced Metal and Alloy Dual‐Exsolution in Perovskite Ferrite Oxides Boosting the Performance of Li‐O₂ Battery

Abstract

Atemperature-controlled cation-exchange approach is introduced to achieve aunique dual-exsolution in perovskite La 0.8 Fe 0.9 Co 0.1 O 3Àd where both CoFea lloy and Co metal are simultaneously exsolved from the parent perovskite,f orming an alloya nd metal co-decorated perovskite oxide.M ossbauer spectra showt hat cation exchange of Fe atoms in CoFea lloy and Co cations in the perovskite is the key to the co-existence of Co metal and CoFealloy. The obtained composite exhibits an enhanced catalytic activity as Li-O 2 battery cathode catalysts with as pecific discharge capacity of 6549.7 mAh g À1 and ac ycling performance of 215 cycles without noticeable degradation. Calculations showt hat the combination of decorated CoFea lloya nd Co metal synergistically modulated the discharge reaction pathway that improves the performance of Li-O 2 battery.

Applications of all-inorganic perovskites for energy storage

“…The obtained composites demonstrated an excellent specific discharge capacity of 6549.7 mA h g À1 and a cycle stability of 215 cycles when used in Li-O 2 batteries. 135 In the structure of perovskite oxides, doping at the A-site may form O defects, which indirectly affects the ORR/OER activity of perovskite oxides. The doping of different ions in the B-site directly can influence the B-O-B angle, thereby increasing the intrinsic activity.…”

“…The obtained composites demonstrated an excellent specific discharge capacity of 6549.7 mA h g −1 and a cycle stability of 215 cycles when used in Li–O 2 batteries. 135…”

Emerging Exsolution Materials for Diverse Energy Applications: Design, Mechanism, and Future Prospects

“…The CoFe alloy catalyst synergistically improved the OER and ORR characteristics of Li−O 2 batteries compared with single-metal Co or Fe exsolution systems. Cong et al 128 reported the enhanced catalytic performance of CoFe alloy nanoparticles on a La 0.8 Fe 0.9 Co 0.1 O 3−δ perovskite scaffold. The CoFe alloy exsolution electrode exhibited a low overpotential and remarkable redox stability over more than 200 cycles.…”

2D Co-doped MnCr2O4 nanosheets as efficient bifunctional cathode materials for long-life Li–O2 batteries

“…4,5 One of the most effective strategies to address these issues is to develop inexpensive and efficient cathode catalysts. 6,7 With the progress of research, cathode catalysts have become an important part of LOBs, among which carbon materials, 8,9 noble metals, 10,11 and non-noble metal compounds [12][13][14][15] have been widely studied to improve the performance of batteries.…”