A Solid-State Electrolyte Based on Electrochemical Active LiMn2O4 for Lithium Metal Batteries

IF 12.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Central Science Pub Date : 2024-11-05 DOI:10.1039/d4ta05743k

Jingzhen Du, Zhichao Chen, Bohao Peng, Zewen Sun, Wenzhuo Wu, Qi Zhou, Xia Shuang, Lili Liu, Lijun Fu, Yuhui Chen, Tao Wang, Yuping Wu

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引用次数: 0

Abstract

The key to the practical application of lithium metal batteries (LMBs) lies in developing solid state electrolytes (SSEs) that are simple to prepare and exhibit excellent performance. In this work, commercial and cheap cathode material LiMn₂O₄ (LMO) is used as an SSE and mixed with poly(vinylidene difluoride) (PVDF) to create SSEs aimed at improving interfacial stability and electronic insulation. The LMO-3 SSE, containing 30 wt.% LMO, demonstrates high ionic conductivity (5.17 × 10^-4 S cm^-1 at 35 °C), low electronic conductivity (< 10⁻⁹ S cm⁻¹), and good interfacial contact and stability with both the lithium metal anode and LiFePO₄ (LFP) cathode. The Li||LFP cell with LMO-3 exhibits good cycling stability at a current density of 0.5 C (200 cycles, maintaining a discharge specific capacity of 147.7 mAh g^-1, with a capacity retention rate of 96.0% and a coulombic efficiency of 99.8%). This study provides a direction for the application of LMO in high-performance SSEs and LMBs, paving another economic route to the commercialization of solid-state lithium metal batteries.

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基于电化学活性 LiMn2O4 的固态电解质用于锂金属电池

锂金属电池（LMB）实际应用的关键在于开发制备简单、性能优异的固态电解质（SSE）。在这项研究中，商业化的廉价正极材料锰酸锂（LMO）被用作固态电解质，并与聚偏二氟乙烯（PVDF）混合制成固态电解质，旨在提高界面稳定性和电子绝缘性。含有 30 wt.% LMO 的 LMO-3 SSE 具有高离子电导率（35 °C 时为 5.17 × 10-4 S cm-1）、低电子电导率（< 10-9 S cm-1）以及与锂金属阳极和磷酸铁锂（LFP）阴极良好的界面接触性和稳定性。含有 LMO-3 的锂离子电池在 0.5 C 的电流密度下具有良好的循环稳定性（循环 200 次，放电比容量保持在 147.7 mAh g-1，容量保持率为 96.0%，库仑效率为 99.8%）。这项研究为 LMO 在高性能 SSE 和 LMB 中的应用指明了方向，为固态锂金属电池的商业化铺平了另一条经济之路。

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来源期刊

ACS Central Science Chemical Engineering-General Chemical Engineering

CiteScore

25.50

自引率

0.50%

发文量

194

审稿时长

10 weeks

期刊介绍： ACS Central Science publishes significant primary reports on research in chemistry and allied fields where chemical approaches are pivotal. As the first fully open-access journal by the American Chemical Society, it covers compelling and important contributions to the broad chemistry and scientific community. "Central science," a term popularized nearly 40 years ago, emphasizes chemistry's central role in connecting physical and life sciences, and fundamental sciences with applied disciplines like medicine and engineering. The journal focuses on exceptional quality articles, addressing advances in fundamental chemistry and interdisciplinary research.