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Co ((acac) ₂-Li₂O₂的中介调节在氧电池中的渐变增长

Xingzi Zheng^1,2, Peiyuan Su¹, Jingshen Xu¹

¹Center for Advanced Materials Research and Faculty of Arts and Sciences, Instrumentation and Service Center for Science and Technology, Beijing Normal University, Zhuhai 519087, China.

|April 28, 2025

概括

乙烯基酸盐通过用离子对过氧化物 (Li2O2) 进行兴奋剂来增强氧 (Li-O2) 电池. 这提高了-O2电池的性能,使得400多个循环减少了超电位.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

氧 (Li-O2) 电池使用过氧化 (Li2O2) 作为阴极材料,但其绝缘特性限制了性能.
优化Li2O2的组成和形态是提高Li-O2电池电化学性能至关重要的.

研究的目的:

在Li-O2电池电解质中引入乙烯基酸盐 (Co(acac) 2以改善Li2O2生成和分解.
为了实现梯度控制和优化Li2O2的增长通过Coacac的离子迁移2.
为了稳定反应性物种并减轻Li-O2电池中的副作用.

主要方法:

将乙烯基酸盐 (Co ((acac) 2) 纳入Li-O2电池的正极电解质中.
使用电场下的Co(acac) 2的离子迁移来控制Li2O2的形成.
在现场UV-vis和XANES光谱学研究Co (acac) 2和LiO2物种之间的相互作用.
电化学测试用于评估电池性能,包括超电位和可循环.

主要成果:

Co(acac) 2促进了Co-doped Li2O2的生成和分解,具有梯度控制和优化的形态.
Co ((acac) 2稳定LiO2物种并减少副作用,通过现场光谱学证实了这一点.
Co ((acac) 2 增强的 Li-O2 电池系统表现出快速反应动力学,减少了 520 mV 的超电位.
实现了超过400个周期的扩展循环性,极化明显降低.

结论:

乙氨酸化剂是提高Li-O2电池性能的一种有效策略.
Co ((acac) 2介导的工艺优化了Li2O2的生长和稳定性,从而改善了电化学性能.
这种新的方法为开发高性能和持久的Li-O2电池提供了一个有希望的途径.

关键词:

添加剂 Co ((acac) 2 的添加剂.2O2 的增长速度是二氧化电池的电池是二氧化的电池.在X射线吸收频谱中,这是一种自我催化.

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