DOI number:10.1002/adma.74257

Journal:Advanced Materials

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 (LiBO2)-mediated electrolyte (LBME) that leverages colloid interfacial chemistry to regulate the Li+ solvation structure. Stable LiBO2 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 || LiNi0.5Mn1.5O4 (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 || LiNi0.8Co0.1Mn0.1O2 (NCM811) and 5 Ah silicon-graphite (Si-C) || LiNi0.91Co0.06Mn0.03O2 (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.

Indexed by:Journal paper

Document Code:https://doi.org/10.1002/adma.74257

Translation or Not:no

Date of Publication:2026-07-24