Researchers Develop New Material That Makes Clean Energy Storage More Compact and Affordable

Researchers at ARCI have developed a spinel nanocomposite phase change material (PCM) that boosts thermal battery efficiency by up to 45%, offering a cost‑effective solution for clean energy storage in concentrated solar power and industrial waste heat recovery systems. This breakthrough, published in Materials Today Chemistry, aligns with India’s Aatma Nirbhar Bharat initiative and global clean energy goals.

Breakthrough in Simple Words

Scientists have found a smart way to make thermal batteries—used to store heat for later—work better and cost less. These batteries save heat from the sun in solar power plants or capture wasted heat from factories, turning it into useful energy.

The ARCI team discovered that mixing just 1% of special spinel nanoparticles into the storage material helps batteries hold 45% more heat.

What This Means

• Smaller tanks are needed to store the same amount of energy
• Lower costs for building and running these systems
• More efficient clean energy for homes, industries, and power plants

This breakthrough makes clean energy storage cheaper, more compact, and more powerful—helping India and the world move closer to reliable renewable energy.

Key Breakthrough

• Institution: International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), under India’s Department of Science and Technology
• Lead Scientist: Dr. Mani Karthik
• Innovation: Spinel oxide nanoparticles added to PCM via a simple co‑precipitation method
• Impact: Just 1% nanoparticle addition increased specific heat capacity by 45%, enabling more compact and efficient thermal energy storage

Why It Matters

• Concentrated Solar Power (CSP): TES systems are critical for storing solar heat and releasing it when sunlight is unavailable
• Industrial Waste Heat Recovery: Captures and reuses excess heat, reducing energy loss
• Cost Savings: Higher energy density means smaller tanks, less construction material, and lower capital/operational costs. 
• Scalability: The process is cost‑effective and scalable, making it suitable for large‑scale deployment

Global Relevance

• Clean Energy Transition: Supports worldwide efforts to decarbonize power generation. 
• Compact Design: Enables next‑generation thermal batteries that are lighter, cheaper, and more efficient. 
• Indigenous Expertise: Strengthens India’s position in advanced energy materials research while contributing to global sustainability

Comparative Advantages

Feature	Conventional PCM	Spinel Nanocomposite PCM
Specific Heat Capacity	Baseline	+45% increase
Thermal Stability	Moderate	Excellent
Tank Size	Larger	Reduced by ~40%
Cost Efficiency	Higher material & construction costs	Lower capital & operational costs
Scalability	Limited	Scalable, cost‑effective process

Mechanism of Improvement

• Nanoparticle Dispersion: Uniform distribution increases surface area. 
• Stable Spinel Oxide Layer: Forms at the PCM interface, enhancing surface energy
• Result: Higher energy storage per unit mass, improved thermal conductivity, and long‑term stability

Strategic Impact

• India’s Energy Goals: Supports Aatma Nirbhar Bharat by advancing indigenous clean energy technologies. 
• Global Adoption: Potential to revolutionize thermal batteries for CSP plants worldwide. 
• Publication: Materials Today Chemistry (Elsevier), 2026, DOI: 10.1016/j.mtchem.2025.103282