Composite polymer electrolytes containing Co(NO3)2 can construct Li3N-rich interfacial layers in lithium-metal batteries

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2025-04-24 DOI:10.1016/j.electacta.2025.146305

Hui Li, Hongfang Jiu, Lixin Zhang, Jinfeng Ma, Qian Xu, Yahui Wang, Xintong Chai, Kai Chen, Yunkai Zhang, Fan Wu

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Abstract

Lithium metal batteries (LMBs) hold significant promise for energy storage applications, yet they are hindered by low ionic conductivity and severe interfacial issues with the electrolyte. In this study, we developed a Co(NO₃)₂@CPEs system to address these challenges. By incorporating Co(NO₃)₂ additives and LLZTO nanoparticles into the PEO matrix, we aimed to reduce PEO crystallization and enhance Li⁺ transport. Additionally, this approach facilitated the formation of a Li3N-rich solid electrolyte interphase (SEI) layer. The study demonstrate that the inclusion of Co(NO₃)₂ promotes the generation of more Li₃N, LiF, and Li₂Co. These inorganic components significantly improve Li⁺ transport and help prevent the uneven deposition of lithium metal. Co(NO₃)₂@CPEs has an ionic conductivity of 4.96 × 10^-4 S·cm^-2 at 60°C (ionic conductivity of 2.4 × 10^-5 S·cm^-2 at 30°C), a Li⁺ migration number of 0.41, and an electrochemical window of 4.5 V. In addition, the lithium-symmetric battery can be stably cycled for 800 h at a current density of 0.2 mA·cm^-2. The lithium metal battery with lithium iron phosphate (LiFePO₄) as the cathode, on the other hand, has good multiplication capability and cycling stability, in which it can be cycled for 200 revolutions at 0.5 C and has an initial specific capacity of 148.08 mAh·g^-1.

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含Co(NO3)2的复合聚合物电解质可以在锂金属电池中构建富li3n界面层

锂金属电池（lmb）在能量存储应用中具有重要的前景，但它们受到低离子电导率和电解质严重界面问题的阻碍。在本研究中，我们开发了Co(NO3)2@CPEs系统来解决这些挑战。通过在PEO基体中加入Co(NO3)2添加剂和LLZTO纳米颗粒，我们旨在减少PEO的结晶，增强Li+的输运。此外，这种方法促进了富li3n固体电解质间相（SEI）层的形成。研究表明，Co(NO3)2的加入促进了Li3N、LiF和Li2Co的生成。这些无机成分显著改善了锂离子的输运，有助于防止金属锂的不均匀沉积。Co(NO3)2@CPEs在60℃时离子电导率为4.96 × 10-4 S·cm-2（在30℃时离子电导率为2.4 × 10-5 S·cm-2）， Li+迁移数为0.41，电化学窗口为4.5 V。此外，该锂对称电池在0.2 mA·cm-2电流密度下可稳定循环800 h。而以磷酸铁锂（LiFePO4）为正极的锂金属电池则具有良好的倍增能力和循环稳定性，在0.5℃下可循环200转，初始比容量为148.08 mAh·g-1。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.