Ye Xiaolu, Wang Tengrui, Wen Jiayun, Yu Qian, Chen Yuwei, Cai Kefeng, Luo Wei
Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.
Small Methods. 2024 Dec;8(12):e2400036. doi: 10.1002/smtd.202400036. Epub 2024 Mar 26.
Solid-state Li metal batteries (SSLMBs) are attractive due to their capability to simultaneously offer high energy density and high-level safety when combining Li metal anodes, solid-state electrolytes (SSEs), and high-voltage cathodes together. However, SSLMBs may well incur short circuits caused by Li dendrites penetrations, which mainly originate from the instability and poor contact between Li metal and SSEs. Herein, by taking full advantage of the reaction products of Li and LiAlTi(PO) (LATP), a lithium-LATP composite anode (Li-LATP) is obtained, in which a stable matrix is formed to enhance the contact between Li and the garnet-type SSEs, alleviating the volume change and preserving an intact interface during the charge/discharge process. Consequently, the Li-LATP/garnet/Li-LATP symmetric cell displays a fairly low interfacial resistance of 6 Ω cm and stable cycling performance for over 2500 h with a low overpotential. Furthermore, the LiCoO/garnet/Li-LATP full cell also shows a high discharge capacity of 159 mAh g and great cycling performance.
固态锂金属电池（SSLMBs）具有吸引力，因为当将锂金属阳极、固态电解质（SSEs）和高压阴极结合在一起时，它们能够同时提供高能量密度和高安全性。然而，SSLMBs很可能会因锂枝晶穿透而导致短路，这主要源于锂金属与SSEs之间的不稳定性和不良接触。在此，通过充分利用锂与LiAlTi(PO)（LATP）的反应产物，获得了一种锂-LATP复合阳极（Li-LATP），其中形成了一个稳定的基体，以增强锂与石榴石型SSEs之间的接触，减轻体积变化，并在充/放电过程中保持完整的界面。因此，Li-LATP/石榴石/Li-LATP对称电池显示出相当低的6Ω·cm界面电阻，并具有低过电位下超过2500小时的稳定循环性能。此外，LiCoO/石榴石/Li-LATP全电池还显示出159 mAh g的高放电容量和出色的循环性能。
