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Borate-Based Artificial Solid-Electrolyte Interphase Enabling Stable Lithium Metal Anodes
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DOI：10.1021/acsami.3c11673.png)
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Abstract
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Lithium (Li) metal is considered as the holy grail of anode materials for next-generation high energy batteries. However, notorious dendrite growth and interfacial instability could induce irreversible capacity loss and safety issues, limiting the practical application of Li metal anodes. Herein, we develop a novel approach to construct a borate-based artificial solid-electrolyte interphase (designated as B-SEI) through the reaction of metallic Li with triethylamine borane (TEAB). According to our cryogenic electron microscopy (Cryo-EM) characterization results, the artificial SEI adopts a glass-crystal bilayer structure, which facilitates uniform Li-ion transport and inhibits dendrite growth during Li plating. Benefiting from such an artificial SEI, the Li anode delivers an improved rate performance and prolonged cycle life. The symmetric Li/B-SEI||Li/B-SEI cell can maintain stable cycling for 700 h at a high current density of 3 mA cm(-2). The full-cell pairing Li/B-SEI with LiFePO4 only exhibits minimal capacity decay after 500 cycles in a conventional carbonate-based electrolyte. This work demonstrates the feasibility of building a boride-based artificial SEI to stabilize the Li metal anode based on microscopic characterization results and comprehensive electrochemical data, which represents a promising avenue to develop practical Li metal batteries.
Keywords:
lithium metal anode
solid-electrolyte interphase
cryogenic electron microscopy
lithium borates
full lithium metal batteries
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8.2
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6.1W
Citations:
38.7W
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Cited Papers
Correlating Structure and Function of Battery Interphases at Atomic Resolution Using Cryoelectron Microscopy.png)
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