TY - JOUR
T1 - Regulating Li Nucleation and Growth Heterogeneities via Near-Surface Lithium-Ion Irrigation for Stable Anode-Less Lithium Metal Batteries
AU - Xie, Chuyi
AU - Zhao, Chen
AU - Jeong, Heonjae
AU - Liu, Qiang
AU - Li, Tianyi
AU - Xu, Wenqian
AU - Cheng, Lei
AU - Xu, Gui Liang
AU - Amine, Khalil
AU - Chen, Guohua
N1 - Publisher Copyright:
© 2023 UChicago Argonne, LLC and The Authors. Small published by Wiley-VCH GmbH.
PY - 2024/3/22
Y1 - 2024/3/22
N2 - The inhomogeneous nucleation and growth of Li dendrite combined with the spontaneous side reactions with the electrolytes dramatically challenge the stability and safety of Li metal anode (LMA). Despite tremendous endeavors, current success relies on the use of significant excess of Li to compensate the loss of active Li during cycling. Herein, a near-surface Li+ irrigation strategy is developed to regulate the inhomogeneous Li deposition behavior and suppress the consequent side reactions under limited Li excess condition. The conformal polypyrrole (PPy) coating layer on Cu surface via oxidative chemical vapor deposition technique can induce the migration of Li+ to the interregional space between PPy and Cu, creating a near-surface Li+-rich region to smooth diffusion of ion flux and uniform the deposition. Moreover, as evidenced by multiscale characterizations including synchrotron high-energy X-ray diffraction scanning, a robust N-rich solid-electrolyte interface (SEI) is formed on the PPy skeleton to effectively suppress the undesired SEI formation/dissolution process. Strikingly, stable Li metal cycling performance under a high areal capacity of 10 mAh cm−2 at 2.0 mA cm−2 with merely 0.5 × Li excess is achieved. The findings not only resolve the long-standing poor LMA stability/safety issues, but also deepen the mechanism understanding of Li deposition process.
AB - The inhomogeneous nucleation and growth of Li dendrite combined with the spontaneous side reactions with the electrolytes dramatically challenge the stability and safety of Li metal anode (LMA). Despite tremendous endeavors, current success relies on the use of significant excess of Li to compensate the loss of active Li during cycling. Herein, a near-surface Li+ irrigation strategy is developed to regulate the inhomogeneous Li deposition behavior and suppress the consequent side reactions under limited Li excess condition. The conformal polypyrrole (PPy) coating layer on Cu surface via oxidative chemical vapor deposition technique can induce the migration of Li+ to the interregional space between PPy and Cu, creating a near-surface Li+-rich region to smooth diffusion of ion flux and uniform the deposition. Moreover, as evidenced by multiscale characterizations including synchrotron high-energy X-ray diffraction scanning, a robust N-rich solid-electrolyte interface (SEI) is formed on the PPy skeleton to effectively suppress the undesired SEI formation/dissolution process. Strikingly, stable Li metal cycling performance under a high areal capacity of 10 mAh cm−2 at 2.0 mA cm−2 with merely 0.5 × Li excess is achieved. The findings not only resolve the long-standing poor LMA stability/safety issues, but also deepen the mechanism understanding of Li deposition process.
KW - lithium metal batteries
KW - low Li excess
KW - oxidative chemical vapor deposition
KW - solid-electrolyte interphase
KW - synchrotron high-energy X-ray diffraction scanning
UR - http://www.scopus.com/inward/record.url?scp=85176107816&partnerID=8YFLogxK
U2 - 10.1002/smll.202306868
DO - 10.1002/smll.202306868
M3 - Journal article
C2 - 37946620
AN - SCOPUS:85176107816
SN - 1613-6810
VL - 20
JO - Small
JF - Small
IS - 12
M1 - 2306868
ER -