Homogeneously Planar-Exposure LiB Fiber Skeleton Toward Long-Lifespan Practical Li Metal Pouch Cells

Kecheng Long; Xinsheng Liu; Jixu Yang; Han Wang; Anbang Wang; Yuejiao Chen; Lin Mei; Yu Zhang; Zhibin Wu; Weikun Wang; Zhaoqing Jin; Libao Chen

doi:10.1002/smll.202311193

Homogeneously Planar-Exposure LiB Fiber Skeleton Toward Long-Lifespan Practical Li Metal Pouch Cells

Small. 2024 May 13:e2311193. doi: 10.1002/smll.202311193. Online ahead of print.

Authors

Kecheng Long^{1

2}, Xinsheng Liu¹, Jixu Yang¹, Han Wang³, Anbang Wang², Yuejiao Chen¹, Lin Mei¹, Yu Zhang³, Zhibin Wu¹, Weikun Wang², Zhaoqing Jin², Libao Chen^{1

4}

Affiliations

¹ State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P. R. China.
² Research Institute of Chemical Defense, Beijing, 100191, China.
³ Beihang University, Beijing, 100191, China.
⁴ National Energy Metal Resources and New Materials Key Laboratory, Central South University, Changsha, 410083, P. R. China.

PMID: 38739093
DOI: 10.1002/smll.202311193

Abstract

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.

Keywords: Li alloy anodes; LiB alloy; Li||LCO pouch cells; Li||S pouch cells; friction coating.

Abstract

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