Tailoring Li Deposition by Regulating Structural Connectivity of Electrochemical Li Reservoir in Li-metal Batteries.

Angew Chem Int Ed Engl

State Key Lab for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials (Xiamen University), College of Materials, Xiamen University, Xiamen, 361005, P. R. China.

Published: March 2024

AI Article Synopsis

  • Irregular lithium (Li) deposition causes poor performance and safety risks in Li metal batteries, often linked to the traditional testing methods that dissolve Li entirely.
  • The study reveals that maintaining structural connectivity in the electrochemical lithium reservoir is crucial for consistent lithium deposition and growth.
  • Adjusting the shape of the lithium reservoir can enhance battery efficiency and longevity by improving how lithium is deposited during battery operation.

Article Abstract

Irregular Li deposition is the major reason for poor reversibility and cycle instability in Li metal batteries, even leading to safety hazards, the causes of which have been extensively explored. The structural disconnection induced by completely dissolving Li in the traditional testing protocol is a key factor accounting for irregular Li growth during the subsequent deposition process. Herein, the critical role played by the structural connectivity of electrochemical Li reservoir in subsequent Li deposition behaviors is elucidated and a morphology-performance correlation is established. The structural connection and resultant well-distributed morphology of the in situ electrochemical Li reservoir ensure efficient electron transfer and Li diffusion pathway, finally leading to homogenized Li nucleation and growth. Tailoring the geometry of Li reservoir can improve the coulombic efficiency and cyclability of anode-free Li metal batteries by optimizing Li deposition behavior.

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http://dx.doi.org/10.1002/anie.202319847DOI Listing

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