西安理工大学孙学良团队报道了用于固态电池的锂金属兼容反萤石电解质。相关研究成果发表在2024年4月23日出版的《美国化学会杂志》。

锂（Li）金属固态电池具有高能量密度和更高的安全性，因此被认为是传统锂离子电池的有前途的替代品。在实践中，由于缺乏对阳极侧的还原分解具有良好稳定性的超离子固体电解质，使用锂金属阳极仍然具有挑战性。

该文中，研究人员提出了一种与传统的无机结构相比具有反结构的新电解质设计，以实现锂金属阳极的内在热力学稳定性。设计并合成了富锂反萤石固体电解质，其在室温下具有2.1×10^–4 S cm^–1的高离子电导率，具有三维快速锂离子传输路径，并在锂-锂对称电池中表现出高稳定性。

该文还介绍了具有锂金属阳极和LiCoO₂阴极的可逆全电池，显示了富锂反萤石作为高能量密度固态电池的锂金属相容性固体电解质的潜力。

附：英文原文

Title: Lithium Metal-Compatible Antifluorite Electrolytes for Solid-State Batteries

Author: Pengcheng Yu, Haochang Zhang, Fiaz Hussain, Jing Luo, Wen Tang, Jiuwei Lei, Lei Gao, Denys Butenko, Changhong Wang, Jinlong Zhu, Wen Yin, Hao Zhang, Songbai Han, Ruqiang Zou, Wei Chen, Yusheng Zhao, Wei Xia, Xueliang Sun

Issue&Volume: April 23, 2024

Abstract: Lithium (Li) metal solid-state batteries feature high energy density and improved safety and thus are recognized as promising alternatives to traditional Li-ion batteries. In practice, using Li metal anodes remains challenging because of the lack of a superionic solid electrolyte that has good stability against reduction decomposition at the anode side. Here, we propose a new electrolyte design with an antistructure (compared to conventional inorganic structures) to achieve intrinsic thermodynamic stability with a Li metal anode. Li-rich antifluorite solid electrolytes are designed and synthesized, which give a high ionic conductivity of 2.1 × 10–4 S cm–1 at room temperature with three-dimensional fast Li-ion transport pathways and demonstrate high stability in Li–Li symmetric batteries. Reversible full cells with a Li metal anode and LiCoO2 cathode are also presented, showing the potential of Li-rich antifluorites as Li metal-compatible solid electrolytes for high-energy-density solid-state batteries.

DOI: 10.1021/jacs.4c02170

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c02170