A Major Breakthrough in Long-Duration Energy Storage Technology! On April 10 (Thursday) at 10:45 AM, ZH Energy will unveil the world's first 125kW/1MWh sulfur-iron flow battery system at the New Product Launch Area of Pavilion B1 during the 13th Beijing International Energy Storage Summit. Compared to the mainstream vanadium flow battery technology, the sulfur-iron flow battery reduces electrolyte costs by 85%, significantly lowers the system cost for 6-12 hour energy storage, and eliminates reliance on vanadium resources, providing a new solution for global clean energy transition.

**Technological Innovation: A New Breakthrough in Long-Duration Energy Storage**

As the world's first company to commercialize sulfur-iron battery technology, ZH Energy leverages the core technology developed by its founder, Dr. Xie Wei, during his research on sulfur-based flow batteries in the United States. In collaboration with Professor Liu Suqin's team from Central South University, the company has developed an innovative sulfur-iron electrolyte system. Based on low-cost and easily accessible materials like sulfur and iron, this technology achieves molecular-level electrolyte restructuring and system integration innovation, enhancing energy efficiency and cycle life while reducing system costs. The sulfur-iron flow battery offers the following core advantages:

- **Lowest Cost**: Electrolyte costs are nearly one-tenth of vanadium-based electrolytes, making it the most cost-effective among all flow battery technologies.
- **High Economic Value**: System installation costs are comparable to lithium-ion batteries, while the levelized cost of electricity over its lifetime is half that of lithium-ion batteries.
- **Controlled Supply Chain**: Raw materials for the electrolyte are abundant and stable, eliminating resource constraints and price volatility.
- **Fully Liquid System**: Both positive and negative electrodes are liquid electrolytes, eliminating the risk of dendrite formation from metal phase changes.
- **Stable Electrolyte**: Inorganic salt-based electrolyte ensures structural stability with no degradation risks.

**Innovation and Iteration: The Development Journey of Sulfur-Iron Batteries**

- **2016**: The design concept was first proposed by the Pacific Northwest National Laboratory in the United States.
- **2018**: Dr. Xie Wei collaborated with MIT to develop a sulfur-based flow battery under the U.S. Department of Energy's long-duration energy storage project, achieving a current density of 10mA/cm².
- **2021**: ZH Energy partnered with Central South University to initiate sulfur-iron battery development, achieving an initial current density of 20mA/cm².
- **2024**: ZH Energy, in collaboration with State Grid, commissioned the world's first 5kW/20kWh sulfur-iron energy storage system, achieving a current density of 80mA/cm².
- **2025**: ZH Energy launched the world's first 125kW/1MWh sulfur-iron battery demonstration system, achieving a current density of 100mA/cm².
- **2026**: ZH Energy introduced the world's largest 250kW/2MWh sulfur-iron battery commercial module, achieving a current density of 120mA/cm².

As a global leader in sulfur-iron flow battery technology, ZH Energy has pioneered the commercialization of this technology through breakthrough innovations and full-chain autonomy. The company has filled the industrialization gap in the sulfur-iron technology pathway for flow batteries and is contributing to the large-scale development and application of long-duration energy storage technologies worldwide.

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