A new study titled ‘Recycling of solar cells recovered from waste panels into efficient silicon-based composite electrodes for energy-storage applications,’ has demonstrated a practical route to convert discarded solar panels into high performance materials for lithium ion batteries, offering a dual solution to the growing challenge of solar waste and the rising demand for energy storage.
With global renewable energy capacity reaching 4448 GW by the end of 2024 and solar accounting for nearly 42% of the total, the industry is now facing a surge in end of life photovoltaic modules. Panels installed in the late 1990s and early 2000s are reaching retirement, creating a rapidly expanding waste stream and intensifying the need for viable recycling solutions.
Researchers have developed an eco-friendly and less toxic method to recover silicon and silica from crystalline silicon solar cells. The recovered material, processed into a composite powder, achieved a purity of 99.52% and was repurposed as an electrode material for lithium ion energy storage systems.
The study highlights the significant opportunity in reclaiming silicon from solar waste. Silicon offers a theoretical storage capacity of around 4200 mAh per gram, more than ten times higher than conventional graphite anodes, making it a highly attractive material for next generation batteries.
Flowchart of the recovery process of silicon and silica powder from waste photovoltaic modules and its subsequent application in electrode fabrication. Study authors provided
To test its performance, the recycled silicon was combined with conductive additives and deposited onto different substrates including copper foil, indium tin oxide coated glass and graphite sheets. The results showed that substrate choice plays a critical role in determining how the material stores and releases energy.
Electrodes fabricated on graphite delivered the highest specific capacitance at 163.92, followed by copper at 143.23, while indium tin oxide recorded 30.53. The graphite based electrodes also demonstrated capacitive charge storage behaviour, while copper and indium tin oxide showed diffusion controlled battery type characteristics.
Importantly, the recycled silicon electrodes maintained stable electrochemical performance for up to 500 charge discharge cycles, indicating their potential for practical deployment in energy storage systems.
Beyond performance, the research underscores a broader shift towards circularity in the renewable energy sector. By recovering high value materials from decommissioned solar panels and reintegrating them into battery supply chains, the approach reduces environmental impact while supporting resource security.
The findings point to a scalable pathway for linking solar waste management with energy storage manufacturing, particularly relevant for emerging markets where both solar deployment and battery demand are accelerating. Further work will focus on improving cycling stability and adopting water soluble binders to enhance environmental performance in electrode fabrication.
Author: Bryan Groenendaal
May 26, 2026
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