Zheng Li-Jun, Song Li-Na, Wang Xiao-Xue, Liang Shuang, Wang Huan-Feng, Du Xing-Yuan, Xu Ji-Jing
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
International Center of Future Science, Jilin University, Changchun, 130012, P. R. China.
Angew Chem Int Ed Engl. 2023 Oct 26;62(44):e202311739. doi: 10.1002/anie.202311739. Epub 2023 Sep 25.
Rechargeable lithium-oxygen (Li-O ) 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, Li O ) 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 Li O 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-O 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-O 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.
具有高理论能量密度的可充电锂氧（Li-O₂）电池被认为是便携式电子设备和电动汽车的有前景的候选者，然而由于反应动力学迟缓及阴极钝化导致的循环稳定性差，其商业应用受到阻碍。在此，源自放电产物（过氧化锂，Li₂O₂）生长和分解的内应力被用作微观压力源来诱导内建电场，进而改善循环过程中的反应动力学和界面锂离子（Li⁺）传输。由固态Li₂O₂的内应力 - 应变引起的压电势能够为载流子的分离和传输提供驱动力，增强Li⁺转移，从而改善Li-O₂电池的氧化还原反应动力学。结合各种原位表征，系统地研究了典型压电材料钛酸钡（BTO）的催化机制，并明确了应力 - 应变转变对Li-O₂电池电化学反应动力学和Li⁺界面传输的影响。这些发现为内应力与电场之间的表面耦合策略提供了深入见解，以调节电化学反应动力学行为并增强电池系统的界面Li⁺传输。
