Fluorine induced surface reconstruction of perovskite ferrite oxide as cathode catalyst for prolong-life Li-O2 battery

阴极 钙钛矿(结构) 材料科学 氧化物 催化作用 铁氧体(磁铁) 化学工程 电池(电) 冶金 复合材料 无机化学 化学 物理化学 热力学 工程类 有机化学 功率(物理) 物理
作者
Hongwei Hou,Yingge Cong,Qian Zhu,Zhibin Geng,Xiyang Wang,Zhiyu Shao,Xiaofeng Wu,Keke Huang,Shouhua Feng
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:448: 137684-137684 被引量:19
标识
DOI:10.1016/j.cej.2022.137684
摘要

The LaF 3 /LFCO composite was obtained through fluorine induced surface reconstruction and exhibited excellent battery performance, including higher specific capacity and overpotential, especially prolong-life. • LaF 3 /LFCO composite was constructed through a surface reconstruction strategy. • LaF 3 /LFCO exhibits a modified electronic state that regulates Li 2 O 2 morphology. • F doped Li 2 O 2 with better conductivity was formed during the discharge process. • LaF 3 /LFCO composite as cathode catalyst can effectively prolong battery life. Lithium-oxygen batteries are widely studied because of the highest theoretical specific energy density among candidates for next-generation energy storage devices. However, the insulated bulk Li 2 O 2 generated during discharge restricts their further development. Here, we demonstrate a surface reconstruction strategy on perovskite La 0.8 Fe 0.9 Co 0.1 O 3-δ (LFCO) to construct a LaF 3 /LFCO composite, which induces a modified surface and also manipulates the electronic structure. The optimized surface and electronic structure adjust the discharge reaction pathway and form thin petal-like F doped Li 2 O 2 , which have better conductivity compared to traditional discharge product and benefit for Li-O 2 battery performance. This LaF 3 /LFCO leads to much better cycle stability (157 vs 57 cycles) in comparison to the pristine LFCO. This work suggests surface reconstruction provides a new approach in the design of cathode catalyst for long-life lithium-oxygen battery.
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