Intrinsic Stress‐strain in Barium Titanate Piezocatalysts Enabling Lithium−Oxygen Batteries with Low Overpotential and Long Life

过电位 材料科学 钛酸钡 锂(药物) 阴极 电化学 钝化 化学工程 阳极 电化学动力学 电池(电) 化学 纳米技术 电极 复合材料 物理化学 陶瓷 热力学 内分泌学 工程类 医学 图层(电子) 功率(物理) 物理
作者
Lijun Zheng,Lina Song,Xiaoxue Wang,Shuang Liang,Huanfeng Wang,Xing‐Yuan Du,Ji‐Jing Xu
出处
期刊:Angewandte Chemie [Wiley]
卷期号:62 (44) 被引量:7
标识
DOI:10.1002/anie.202311739
摘要

Rechargeable lithium-oxygen (Li-O2 ) batteries with high theoretical energy density are considered as promising candidates for portable electronic devices and electric vehicles, whereas their commercial application is hindered due to poor cyclic stability caused by the sluggish kinetics and cathode passivation. Herein, the intrinsic stress originated from the growth and decomposition of the discharge product (lithium peroxide, Li2 O2 ) is employed as a microscopic pressure resource to induce the built-in electric field, further improving the reaction kinetics and interfacial Lithium ion (Li+ ) transport during cycling. Piezopotential caused by the intrinsic stress-strain of solid Li2 O2 is capable of providing the driving force for the separation and transport of carriers, enhancing the Li+ transfer, and thus improving the redox reaction kinetics of Li-O2 batteries. Combined with a variety of in situ characterizations, the catalytic mechanism of barium titanate (BTO), a typical piezoelectric material, was systematically investigated, and the effect of stress-strain transformation on the electrochemical reaction kinetics and Li+ interface transport for the Li-O2 batteries is clearly established. The findings provide deep insight into the surface coupling strategy between intrinsic stress and electric fields to regulate the electrochemical reaction kinetics behavior and enhance the interfacial Li+ transport for battery system.
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