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A Microscopic Heterogeneous LiBO 2 ‐Mediated Electrolyte for High‐Voltage and Low‐Temperature Lithium‐Ion Batteries

Year: 2026
Type: article
Abstract: ABSTRACT Conventional electrolytes remain fundamentally constrained by the trade‐offs among high‐voltage stability, low‐temperature operation, and fast ion transport, limiting the practical deployment of advanced lithium‐ion batteries (LIBs). Here, we report a micro‐heterogeneous lithium metaborate (LiBO 2 )‐mediated electrolyte (LBME) that leverages colloid interfacial chemistry to regulate the Li + solvation structure. Stable LiBO 2 colloids competitively coordinate with anions through coordinatively unsaturated surface sites, thereby weakening Li + –solvent/anion interactions and accelerating ligand‐exchange kinetics. Consequently, the LBME exhibits enhanced ionic conductivity and reduced Li + desolvation barrier, enabling uniform lithium deposition at −30°C and facilitating a compact inorganic‐rich cathode‐electrolyte interphase (CEI) during ultrahigh‐voltage operation. Consequently, a 5.0 V Li || LiNi 0.5 Mn 1.5 O 4 (LNMO) cell with LBME achieves exceptional cyclability, retaining 99.1% of its capacity after 5000 cycles at 5 C, and maintaining 72% of its room‐temperature capacity at −30°C. The technological viability is further demonstrated in practical pouch cells, where 1 Ah graphite || LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) and 5 Ah silicon‐graphite (Si‐C) || LiNi 0.91 Co 0.06 Mn 0.03 O 2 (NCM90) pouch cells demonstrate superior stability, achieving 87.8% capacity retention (500 cycles) and a striking energy density of 394 Wh kg −1 (89% retention after 120 cycles), respectively. This work demonstrates a heterogeneous electrolyte strategy promising for stable LIBs under harsh conditions.
DOI: 10.1002/adma.74257
Institution: Wuhan University
Language: English
Open Access status: green
OpenAlex ID: W7170655510
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Cites: 44
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