The research, published in the Journal of Industrial Ecology, applies a technique known as dynamic material flow analysis, or dMFA, which tracks how stocks of products and the materials embedded in them accumulate, age, and exit the economy over time. Traditional dMFA studies of electric vehicle batteries have typically assumed simplified relationships between vehicle and battery service lives—often treating the battery as dying with the car. The new framework instead integrates a product-component model that endogenously represents battery replacement, meaning that batteries can fail, be swapped, and continue cycling through the fleet independently of the vehicles that host them. The model draws on survival functions, or hazard functions, for both vehicles and batteries, allowing each to retire according to its own statistical profile.

To ground the model in reality, the researchers assembled an unusually granular dataset for British Columbia. Vehicle population figures came from the Insurance Corporation of British Columbia, while new registration data by fuel type came from Statistics Canada. The team also compiled battery electric vehicle fleet data from 2018 to 2024, including registration counts by model year, vehicle driving range, battery capacity in kilowatt-hours, energy efficiency, and cathode chemistry. Future scenarios were built from provincial population projections, evolving electric vehicle market penetration under British Columbia’s Zero-Emission Vehicles Act, and anticipated shifts in battery technology and chemistry over the coming decades.

The headline findings are striking and, in some respects, counterintuitive. Between 2025 and 2050, enhanced battery replacement could reduce the cumulative inflow of new electric vehicles needed to maintain the provincial fleet by 17 to 22 percent. The logic is that when a battery is replaced rather than the entire vehicle being scrapped, cars stay on the road longer, dampening the demand for brand-new vehicles. Yet the same dynamic increases cumulative lithium-ion battery demand by 7.2 to 7.7 percent, because each replaced battery adds a fresh unit of manufacturing demand even as vehicle production falls. Replacement, in other words, trades vehicle throughput for battery throughput.

Perhaps the most consequential result concerns what happens to batteries when they leave vehicles. The study finds that battery replacement increases the remaining useful capacity of cumulative battery outflow by 45 to 51 percent for batteries retaining at least 80 percent state of health. This is a critical threshold in the battery world: packs that still hold four-fifths of their original capacity are generally considered suitable for second-life applications such as stationary energy storage, where they can buffer renewable electricity for years before final recycling. A wave of healthier retired batteries, the authors show, materially expands the feedstock available for reuse, changing both the economics and the logistics of the battery circular economy.

Technology evolution emerges as the other powerful lever. The model indicates that, with advancements in battery technology, extending the modal battery service life by just four years could reduce cumulative material demand by 9.9 to 14.6 percent. Because lithium, nickel, and cobalt supply chains are geographically concentrated and environmentally intensive, even single-digit percentage reductions in demand translate into meaningful relief for mining pressure, processing capacity, and the carbon footprint of battery manufacturing. The result underscores a point increasingly made across industrial ecology: longevity is a materials strategy, not merely a consumer benefit.

Methodologically, the study represents a step forward in how component-level dynamics are handled in material flow models. By coupling hazard functions for vehicles and batteries, the framework captures timing effects that simpler models miss—such as the way an early battery failure in a young vehicle creates a mid-life battery demand pulse, or how improvements in battery durability shift the age distribution of retiring packs. The model also tracks the quality of outflows, not just their volume, estimating how much usable capacity exits the vehicle fleet each year. That quality dimension is what allows the researchers to quantify reuse potential rather than treating all spent batteries as equivalent waste.

The policy implications for British Columbia are immediate. The province has adopted one of the most ambitious zero-emission vehicle mandates in North America, and it operates an extended producer responsibility regime that is being extended to strengthen battery recycling. The authors explicitly position their model as a decision-support tool for the Government of British Columbia as it evaluates and calibrates its climate strategy, particularly the twin goals of accelerating zero-emission vehicle adoption and building robust battery collection and recycling systems. Knowing when, and in what condition, spent batteries will arrive is essential for sizing recycling facilities, designing collection incentives, and planning second-life storage markets.

The broader significance extends well beyond one province. Jurisdictions worldwide are grappling with the coming surge of retired electric vehicle batteries, and most forecasting exercises still rely on coarse assumptions that tie battery death to vehicle death. The British Columbia study demonstrates that this assumption can misstate both the scale and the character of future battery flows—underestimating replacement-driven battery demand, overestimating the urgency of early recycling capacity, and missing the substantial reservoir of reusable capacity in retired packs. As electric vehicle fleets mature in Europe, China, and the United States, similar product-component integrated models could become standard equipment for planners of the battery circular economy.

The study’s data and system model have been made openly available through the Queen’s University Dataverse Collection, alongside the provincial vehicle population and registration datasets on which the analysis rests. That transparency matters, because the transition to electric mobility will be judged not only on tailpipe emissions but on the full life cycle of the materials that make it possible. By revealing that battery replacement simultaneously shrinks vehicle demand, grows battery demand, and enriches the stream of reusable capacity, the research offers policymakers a more honest ledger—and a clearer map of the decisions that will determine whether the electric vehicle era is genuinely circular or simply shifts the burden from the pump to the mine.

Subject of Research: Dynamic material flow analysis of electric vehicle battery replacement in British Columbia, Canada

Article Title: Product-component integrated dynamic material flow analysis of electric vehicle battery replacement in British Columbia, Canada

Article References: Poulos, A., Zhang, Q., Wang, C., & Young, S. B. (2026). Product-component integrated dynamic material flow analysis of electric vehicle battery replacement in British Columbia, Canada. Journal of Industrial Ecology. https://doi.org/10.1007/s44498-026-00177-y

Image Credits: AI Generated

DOI: 10.1007/s44498-026-00177-y

Keywords: electric vehicles, lithium-ion batteries, battery replacement, material flow analysis, circular economy, battery recycling, battery reuse, zero-emission vehicles, British Columbia, extended producer responsibility, critical minerals, industrial ecology

The significance of the work lies in its approach, known as direct regeneration. Conventional recycling of lithium-ion batteries typically falls into two camps: pyrometallurgy, in which entire cells are smelted at extreme temperatures to yield a mixed metal alloy, and hydrometallurgy, in which cathode powders are dissolved in acids and the constituent metals are precipitated back out as salts. Both approaches destroy the carefully engineered crystal structure of the cathode and require substantial downstream processing to rebuild a battery-grade compound from scratch. Direct regeneration, by contrast, aims to heal the spent cathode in place, replenishing lost lithium and repairing structural damage while retaining the original particles, their morphology and their composition. Because the energy and chemicals invested in making the original cathode are largely preserved, the method promises lower cost, lower emissions and far less material loss.

The research team focused on NMC 532, a layered oxide cathode in which nickel, manganese and cobalt are combined in a 5:3:2 ratio. This composition is a mainstay of the electric vehicle industry because it balances high energy density with good thermal stability and moderate cost. During years of charge and discharge cycling, however, an NMC cathode suffers from a cascade of degradation mechanisms. Lithium is progressively extracted and only partially returned, leaving the material in a lithium-deficient state. The layered crystal structure, which depends on orderly planes of lithium ions to remain stable, begins to collapse as transition metals migrate into the vacated lithium sites. Surface impurities accumulate, including lithium carbonates and hydroxides formed through reactions with electrolyte and moisture, while microcracks open within the particles themselves. The result is a cathode that no longer conducts lithium ions and electrons efficiently and delivers steadily less capacity.

The regeneration procedure developed by Sharma and her co-workers addresses these failures in a sequence of deliberate steps. First, the recovered cathode material undergoes selective impurity removal, stripping away the parasitic surface compounds that would otherwise interfere with electrochemical performance. Next comes controlled relithiation, in which lithium is resupplied to the depleted crystal lattice in carefully metered quantities, restoring the stoichiometric balance that the layered structure requires. Finally, a moderate thermal treatment consolidates the repair, allowing lithium ions to diffuse into their proper interlayer positions and encouraging displaced transition metals to return to their original sites within the oxide framework. The word moderate is important here: unlike processes that demand furnace temperatures well above a thousand degrees, this treatment operates with restrained energy input, keeping the overall energy budget of the process down to roughly 39 kilowatt-hours per kilogram of recovered material.

That energy figure, the authors emphasise, positions the method as a practical and cost-efficient alternative to conventional regeneration chemistry, which can consume far more reagents and power. Minimising chemical usage was an explicit design goal. In hydrometallurgical flowsheets, large volumes of acid, base and precipitating agents are required, generating secondary waste streams that must themselves be treated. By contrast, the thermochemical route reported here uses comparatively little chemistry, relying instead on controlled thermal and compositional manipulation to accomplish the repair. In an industry where the economics of recycling often teeter on the edge of viability, such reductions in consumable and energy costs could make the difference between a laboratory curiosity and a deployable industrial process.

But a recycling method is only as good as the material it produces, and the team subjected their regenerated NMC 532 to a battery of characterisation tests. Structural analysis confirmed that the layered crystal architecture, the defining feature of a functional cathode, had been successfully restored. Morphological examination showed that the particle integrity, often compromised by cracking in degraded cathodes, had been improved, and compositional measurements verified that the nickel, manganese, cobalt and lithium ratios matched the target specification of the original material. These findings matter because cathode performance is intimately tied to structure: when the layered framework is intact and the lithium sites are properly occupied, lithium ions can shuttle in and out of the particles reversibly over thousands of cycles.

Electrochemical testing provided the decisive verdict. Cathodes fabricated from the regenerated powder delivered an initial discharge capacity of 117 milliampere-hours per gram at a 1 C rate, meaning the material could be fully discharged in one hour, a demanding condition for real-world relevance. More impressive still was the durability: the regenerated cathodes exhibited excellent cycling stability, retaining their capacity over extended operation, and achieved a coulombic efficiency of nearly 99 percent after 150 charge-discharge cycles. Coulombic efficiency, which measures how much charge put into a cell comes back out, is a sensitive indicator of parasitic side reactions; a value approaching 99 percent over 150 cycles signals that the regenerated material is electrochemically clean and structurally sound, not merely superficially revived.

The broader implications extend well beyond a single cathode chemistry. Global sales of electric vehicles continue to climb, and analysts project that hundreds of thousands of tonnes of lithium-ion batteries will reach end of life each year within the coming decade. Cobalt and nickel supplies are geographically concentrated and increasingly expensive, and lithium extraction carries its own environmental burdens. A circular economy for batteries, in which cathode materials are repeatedly regenerated and redeployed rather than mined anew and landfilled after use, would blunt these pressures considerably. Direct regeneration methods such as the one demonstrated here sit at the heart of that vision, because they preserve the highest-value component of the cell in a form close to its finished state, bypassing the costly rebuild-from-elements paradigm of conventional recycling.

Challenges remain before thermochemical regeneration can be scaled from laboratory coin cells to gigafactory volumes. Feedstocks arriving at recycling plants vary widely in chemistry, state of charge and degree of contamination, and a commercial process must handle that heterogeneity robustly. Process control of relithiation and thermal treatment must be precise enough to guarantee consistent quality across tonnes of material rather than grams. Nonetheless, the study offers a compelling proof of concept: with selective impurity removal, controlled relithiation and moderate heating, a spent NMC 532 cathode can be coaxed back to life with minimal chemical input and restrained energy consumption, delivering capacities and cycling stability that validate the approach. If such methods mature, today’s discarded batteries could become tomorrow’s supply of battery-grade cathode, turning one of the clean-energy transition’s thorniest waste problems into a renewable resource stream.

Subject of Research: Direct thermochemical regeneration of spent NMC 532 cathode material from end-of-life lithium-ion batteries

Article Title: Regeneration of NMC cathode active material from discarded li-ion batteries by using thermochemical treatment

Article References: Sharma, Y., Guduru, R. K., Tripathi, B., Sarada, B. V., Tewatia, S., & Rashid, A. (2026). Regeneration of NMC cathode active material from discarded li-ion batteries by using thermochemical treatment. Ionics. https://doi.org/10.1007/s11581-026-07498-9

Image Credits: AI Generated

DOI: 10.1007/s11581-026-07498-9

Keywords: lithium-ion batteries, battery recycling, NMC 532 cathode, direct regeneration, thermochemical treatment, relithiation, cathode materials, circular economy, electric vehicles, energy consumption, electrochemical performance, sustainability