China's retired EV batteries could unlock six billion tons of carbon savings with better planning

KNOXVILLE, TN, September 05, 2026 /CourierPR/ -- A new study reveals that China’s retired electric vehicle (EV) batteries hold the potential to unlock significant climate benefits and cost savings, but a spatial mismatch between where batteries retire and where they are needed is hindering their full utilization. According to researchers from Fudan University in Shanghai, this mismatch could lock up six billion tons of carbon dioxide equivalent in climate benefits between 2020 and 2050.

China is the world's largest EV market, and its fleet is expanding rapidly. As a result, a growing number of EV batteries are reaching the end of their useful life. Currently, most of these batteries are processed through conventional metallurgical recycling, which extracts metals but misses opportunities for reuse in energy storage or direct material regeneration. High-value pathways, such as power storage applications and direct recycling, offer greater economic returns and deeper emissions reductions, but they remain underdeveloped.

The study, published on August 24, 2026, in the journal *Environmental Science and Ecotechnology* (DOI: 10.1016/j.ese.2026.100754), outlines an integrated province-level model that projects the supply, demand, and disposal of retired batteries across China from 2020 to 2050. The analysis shows that scenarios prioritizing high-value utilization, such as direct recycling or storage applications, could deliver cost savings 3- to 5-fold greater than those relying on metallurgical recycling, and emissions reductions 1- to 3-fold larger.

However, the spatial separation between retirement hotspots and demand centers is severe. Retired batteries tend to accumulate in economically developed eastern provinces with high EV ownership, while demand for storage is concentrated in renewable-rich western provinces and recycling demand in battery-manufacturing regions. By 2050, under a scenario that prioritizes storage applications, the Gini coefficient, a measure of spatial inequality, rises from 0.6 to 0.7, indicating a growing mismatch. For direct recycling, although the coefficient declines modestly, Guangdong and Fujian alone could face shortages exceeding 3,800 and 4,800 gigawatt-hours, respectively, while other provinces hold surpluses.

Without interprovincial transport, 50-87 percent of the potential cost savings and 26-53 percent of emissions reductions would remain unrealized. Crucially, the researchers found that transport adds only minimal cost and emissions, about 2.3 percent of total cost savings and 0.03 percent of total mitigation, making it a highly efficient intervention.

"Surprisingly, the sheer scale of the gap, six billion tons of carbon reductions locked up simply because batteries retire in the wrong places, was the most striking finding," said the authors. "But the good news is that this is not a technological barrier; it's a logistical and planning challenge. With early, coordinated investment in transport networks and treatment infrastructure, we can turn this spatial mismatch from a liability into a massive opportunity. The cost of moving batteries across provinces is tiny compared to the climate and economic gains we can unlock."

The study provides a practical roadmap for policymakers and industry. Establishing a streamlined national transport network for retired batteries, currently hampered by complex approval procedures and safety regulations, could dramatically improve efficiency while reducing illegal disposal channels. The optimal strategy identified by the team prioritizes storage applications and direct recycling, gradually phasing out metallurgical recycling after 2030. This approach not only cuts emissions but also secures critical materials: batteries used in storage typically re-enter the recycling stream within six years, and regenerated batteries can eventually be recycled too.

For rapidly electrifying markets like the United States and Europe, which face similar spatial mismatches, the Chinese case provides a transferable model. Integrated spatial planning, infrastructure build-out, and cross-regional coordination are essential to realizing the full climate and economic promise of the EV revolution.