LiB alloy is promising lithium (Li) metal anode material because the continuous internal LiB fiber skeleton can effectively suppress Li dendrites and structural pulverization. However, the unvalued surface states limit the practical application of LiB alloy anodes. Herein, the study examined the influence of the different exposure manners of the internal LiB fiber skeleton owing to the various surface states of the LiB alloy anode on electrochemical performance and targetedly proposed a scalable friction coating strategy to construct a lithiated fumed silica (LFS) functional layer with abundant electrochemically active sites on the surface of the LiB alloy anode. The LFS significantly suppresses the inhomogeneous interfacial electrochemical behavior of the LiB alloy anode and enables the exposure of the internal LiB fiber skeleton in a homogeneously planar manner (LFS‐LiB). Thus, a 0.5 Ah LFS‐LiB||LiCoO2 (LCO) pouch cell exhibits a discharge capacity retention rate of 80% after 388 cycles. Moreover, a 6.15 Ah LFS‐LiB||S pouch cell with 409.3 Wh kg−1 exhibits a discharge capacity retention rate of 80% after 30 cycles. In conclusion, the study findings provide a new research perspective for Li alloy anodes.

中文翻译：

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均匀平面暴露 LiB 纤维骨架实现长寿命实用锂金属软包电池

LiB合金是有前途的锂（Li）金属负极材料，因为连续的内部LiB纤维骨架可以有效抑制Li枝晶和结构粉化。然而，未评估的表面状态限制了LiB合金阳极的实际应用。在此，该研究考察了由于LiB合金阳极的不同表面状态而导致内部LiB纤维骨架的不同暴露方式对电化学性能的影响，并有针对性地提出了一种可扩展的摩擦涂层策略，以构建锂化气相二氧化硅（LFS）功能材料。 LiB合金负极表面具有丰富的电化学活性位点。 LFS 显着抑制了 LiB 合金阳极的不均匀界面电化学行为，并使内部 LiB 纤维骨架以均匀平面的方式暴露（LFS-LiB）。因此，0.5 Ah LFS-LiB||LiCoO2(LCO) 软包电池在 388 次循环后放电容量保持率为 80%。此外，6.15 Ah LFS-LiB||S 软包电池容量为 409.3 Wh kg−130次循环后放电容量保持率为80%。总之，研究结果为锂合金负极提供了新的研究视角。