Decoding Hydrogen‑bond Network of Electrolyte for Cryogenic Durable Aqueous Zinc‑ion Batteries

Why It Matters

By eliminating freezing, dendrites, and side‑reactions, the technology unlocks reliable, high‑power zinc‑ion storage in polar and high‑altitude grids, expanding the market for low‑cost aqueous batteries in harsh environments.

Key Takeaways

• Glycerol + MSA lower freezing point to –45 °C.
• (100) Zn orientation cuts stripping energy ~50 %.
• Symmetric cells survive 5,400 h at –20 °C.
• Full cells retain 85 % capacity after 2,000 cycles.
• Enables 10‑minute charging at sub‑zero temperatures.

Pulse Analysis

The rapid growth of renewable energy has pushed storage solutions into ever more demanding settings, from Arctic research stations to mountainous micro‑grids. Traditional aqueous zinc‑ion batteries, prized for safety and low cost, stumble when temperatures dip below –20 °C because water freezes, dendrites pierce the separator, and the hydrogen‑evolution reaction erodes efficiency. By targeting the electrolyte’s hydrogen‑bond lattice, the new glycerol‑MSA formulation raises configurational entropy, effectively depressing the freezing point and reshaping ion solvation. This entropy‑driven strategy not only thwarts ice nucleation but also curtails water’s access to the zinc surface, mitigating corrosion and dendrite growth.

At the heart of the breakthrough is a synergistic dual‑additive system. Fifty percent glycerol disrupts the bulk H‑bond network, while a 1 M concentration of methylsulfonamide trims the coordination number of water around Zn²⁺ from 5.7 to 4.2, fostering a compact, ZnCO₃‑rich solid‑electrolyte interphase. In‑situ spectroscopy confirms blue‑shifted O‑H vibrations, and molecular dynamics simulations reveal preferential ion pathways that preserve high conductivity despite increased viscosity. The engineered (100) crystal orientation on the zinc anode halves the activation energy for stripping, enabling reversible plating at 40 mA cm⁻² and cathode rates of 5 A g⁻¹ without concentration polarization.

The commercial implications are significant. Cryogenic‑stable AZIBs can now power remote grid installations, delivering 78 % capacity after 600 cycles at 1 A g⁻¹ in pouch formats, while also supporting 10‑minute fast‑charging for portable electronics and e‑bikes operating below zero. Because the electrolyte relies on inexpensive, widely available components, integration into existing ZnSO₄ supply chains is straightforward, paving the way for scalable deployment. Future work aims to couple the platform with antifouling polymers for brine environments and fire‑retardant additives for aerospace use, positioning hydrogen‑bond engineered electrolytes as a cornerstone of next‑generation, low‑cost energy storage in extreme climates.