NH4Cl Fe/Cr Electrolyte

23% EE Gain

An iron-chromium electrolyte containing NH4Cl additive that modifies chromium complexation, enhancing conductivity and kinetics, and enabling capacity recovery.

Shuqi, Liu · Bowen, Qu · Meiqi, Fei · Yan, Shuang · Gaobin, Liu · Zhang, Huan

Journal of Energy Storage 2026

Specifications

Energy Efficiency

{'zh': '62', 'en': '62'} %

Capacity Decay Rate

{'zh': '0.081', 'en': '0.081'} %/cycle

Advantages

23% Higher Efficiency

By optimizing the chromium complex composition, the additive enhances electrolyte conductivity and electrochemical kinetics, leading to a significant improvement in energy efficiency.

Capacity Recovery

Ammonium ions preferentially replace water molecules in the solvation shell of chromium ions via competitive coordination, thus recovering the activity of the electrolyte and enabling battery capacity recovery.

Ultra-low Cycle Decay

The battery with reactivated electrolyte exhibits a capacity decay rate of only 0.081% per cycle at 140 mA/cm², indicating excellent long-term stability.

Applications

• Redox Flow Battery Energy Storage：Enhance efficiency and recover capacity of iron-chromium flow batteries, extending system lifetime.
• Renewable Energy Storage：Cost-effective electrolyte activation supports economic large-scale storage of renewables.
• Grid Peak Shaving Storage：High efficiency and recoverability meet grid peak shaving demands for long-term stable operation.