北京化工大学曲晋团队报道了在无枝晶锂沉积和高锂离子通量的锂金属阳极上原位构建非均质层。相关研究成果于2023年1月14日发表在《德国应用化学》。

构建高效的人工表面电解质界面（SEI）膜对于锂金属电池的实际应用至关重要。

该文中，通过层状硅酸锌纳米片和Li的原位反应，构建了一种致密的人工SEI膜，其中亲锂Zn/LixZny均匀但不连续地分散在LixSiOy、Li₂O和LiOH的连续Li⁺导体中。连续的Li⁺导体可以促进溶剂化Li⁺的脱溶过程，并调节锂离子的转移。非连续亲锂金属被内部电场极化，以促进锂离子的转移，并降低形核势垒。因此，在对称电池中，在2.0mA cm^-2下，在750小时内实现了约50mV的低极化，在约13mg cm^-2高LFP面积负载的全电池中实现了99.2%的高容量保持率。

该项工作为开发高效储能的先进碱金属阳极提供了新的视角。

附：英文原文

Title: In-Situ Constructing A Heterogeneous Layer on Lithium Metal Anodes for Dendrite-Free Lithium Deposition and High Li-ion Flux

Author: Hong-Jun Liu, Cheng-Ye Yang, Mei-Chen Han, Chun-Yu Yu, Xiaofeng Li, Zhong-Zhen Yu, Jin Qu

Issue&Volume: 2023-01-14

Abstract: Constructing efficient artificial surface electrolyte interface (SEI) film is extremely vital for the practical application of lithium metal batteries. Herein, a dense artificial SEI film, in which lithiophilic Zn/LixZny are uniformly but nonconsecutively dispersed in the consecutive Li+-conductors of LixSiOy, Li2O and LiOH, is constructed via the in-situ reaction of layered zinc silicate nanosheets and Li. The consecutive Li+-conductors can promote the desolvation process of solvated-Li+ and regulate the transfer of lithium ions. The nonconsecutive lithiophilic metals are polarized by the internal electric field to boost the transfer of lithium ions, and lower the nucleation barrier. Therefore, a low polarization of ~50 mV for 750 h at 2.0 mA cm-2 in symmetric cells, and a high capacity retention of 99.2% in full cells with a high LFP areal loading of ~13 mg cm-2 are achieved. This work offers new sights to develop advanced alkali metal anodes for efficient energy storage.

DOI: 10.1002/anie.202217458

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202217458