1. Half a Century of Battery Evolution Driven by the Pursuit of Higher Energy Density

The history of lithium batteries is not simply a story of replacing one material with another. It is an engineering process that gradually transformed the reversible intercalation/deintercalation of lithium ions from a laboratory phenomenon into an industrial foundation. In 1974, M. Stanley Whittingham proposed the use of layered TiS₂ for lithium-ion intercalation. Subsequent research demonstrated that the Li/TiS₂ system could undergo rapid and reversible electrochemical reactions at room temperature, providing an important foundation for early rechargeable lithium batteries. [1][4]

In 1980, Koichi Mizushima, P. C. Jones, P. J. Wiseman, and John B. Goodenough reported LiₓCoO₂ (LCO) and showed that its open-circuit voltage relative to lithium was approximately twice that of LiₓTiS₂, with high energy density and good reversibility. This was a critical step because it moved the core question for lithium batteries from “can it work?” toward “can it operate at a higher potential and higher energy density?” [2]

True commercialization came in 1991. Sony’s official historical account states that Sony achieved the world’s first commercialized lithium-ion battery in 1991. Its cathode was LiCoO₂, turning a breakthrough in materials science into an industrial platform for mass adoption in consumer electronics. [3]

Table 1. Key milestones in the evolution of lithium battery technologies and materials

2. Why Did Lithium Batteries Move from LCO to LFP, LMFP, NMC, and NCA?

The success of LCO did not mean that it would remain the only cathode material. The industry began moving in two directions. On one side, manufacturers sought higher energy density and longer range, driving the development of high-nickel NMC and NCA. On the other, the industry sought lower cost, greater thermal stability, and reduced dependence on cobalt and nickel, leading to the renewed rise of LFP and the subsequent development of LMFP. Recent materials reviews indicate that nickel-rich NMC/NCA cathodes offer higher energy density but also face challenges involving structural stability, thermal management, and degradation; the trend toward higher nickel content has also been accompanied by lower cobalt usage. [6]

LFP represents another important direction. In 1997, Padhi, Nanjundaswamy, and Goodenough published work on phosphate olivine-type cathode materials; LFP subsequently entered large-scale commercial applications. Its recycling economics differ significantly from those of NMC/NCA. When cathodes contain little or no high-value cobalt and nickel, the economics of a business model based primarily on recovering high-value metals become weaker. Academic and industry literature has long pointed out that LFP recycling is comparatively difficult economically, increasing the importance of direct regeneration, relithiation, and other material-preserving approaches. [5][11][12]

This already contains one of the most important questions facing the recycling industry today: if the battery industry continues moving toward less cobalt, lower nickel content, or even cobalt-free chemistries, recyclers can no longer build the value of every tonne of batteries solely around Co, Ni, and Cu. Recycling value must gradually shift from “metal content” toward material quality, regeneration performance, low-carbon attributes, traceability, and closed-loop value for customers.

3. What Generation of Batteries Are Today’s Recycling Lines Actually Designed For?

Current lithium-ion battery recycling can broadly be divided into pretreatment, mechanical sorting, pyrometallurgy, hydrometallurgy, and direct recycling. The U.S. EPA describes a typical lithium-ion cell as consisting of a cathode, anode, separator, and electrolyte, packaged in cylindrical, prismatic, or pouch formats. At end of life, major risks include residual energy, short circuits, physical damage, and fire. [8]

Accordingly, the first critical step in many recycling flows today is still to “move the battery into a more controllable state” before dismantling, crushing, and material separation. The problem is that battery chemistry is already diversifying. A process optimized for NMC/NCA is not necessarily the most economically attractive for LFP; for future semi-solid and all-solid-state batteries, the front-end pretreatment requirements may be fundamentally different. [7][9]

Table 2. Core logic and limitations of different recycling routes

It is particularly important that recent literature is no longer focused only on “recovery rate,” but increasingly on whether the recovered material can return to its original performance class. For example, direct recycling research on NMC focuses on lithium loss, Li/Ni antisite disorder, surface rock-salt phases, and cracking, because even if the metal elements are recovered, the final product may lose value if its crystal structure cannot be restored. [13]

4. Semi-Solid and All-Solid-State Batteries: The Recycling Challenge Is Not Simply “Less Liquid”

Semi-solid batteries are easily understood as “batteries with a little less liquid electrolyte,” but from a recycling-engineering perspective they are actually an intermediate material system. Public information from WeLion indicates that its semi-solid technology can leverage parts of existing lithium-ion manufacturing processes and equipment, and that a 360 Wh/kg-class cell entered the NIO vehicle program in 2023. This indicates that semi-solid batteries have meaningful manufacturing-side compatibility with established platforms. [14]

With all-solid-state batteries, however, the problem changes significantly. A 2024 Nature Energy review notes that solid electrolytes include several material families, including oxides, sulfides/thiophosphates, halides, and polymers. Recycling routes therefore need to adapt pretreatment, mechanical processing, and metallurgical flows to the specific solid-electrolyte chemistry; compared with conventional lithium-ion batteries, the recyclability of solid-state batteries is still not sufficiently understood. [9]

The real issue: An all-solid-state battery does not simply remove the “electrolyte tank”; it shifts electrolyte management from liquid handling to solid-material separation and chemical-compatibility management.

For batteries using sulfide solid electrolytes, moisture control will be particularly important. Research has shown that sulfide solid electrolytes can generate H₂S when exposed to water while also suffering a decline in ionic conductivity. Therefore, if end-of-life solid-state batteries are directly exposed to normal ambient conditions during dismantling, shredding, or transport, they may present a chemical safety risk that differs from that of today’s liquid-electrolyte batteries. [15][16]

Furthermore, if an all-solid-state battery uses a lithium-metal anode, the recycling system has to account for another highly reactive material. This means that the “safety zone” of a future recycling plant may need to expand beyond firefighting, explosion prevention, and residual-charge management to include humidity control, controlled atmospheres, gas monitoring, and materials passivation.

5. How Far Have Academic Research and Patents Progressed, and How Large Is the Gap to Industrialization?

The answer is that research has begun to establish engineering methods for recycling solid-state batteries, but there remains a clear gap between those methods and a mature, standardized, cross-brand, and economically sustainable commercial recycling system. This is not because research is lacking. On the contrary, recent research and patents are beginning to address highly specific engineering problems.

Representative academic and patent cases:

• [17] A University of California-affiliated patent family, “Recycling all solid-state battery technology,” proposes dissolving complete spent solid-state batteries in anhydrous ethanol, separating the solid electrolyte from electrode materials, and regenerating the materials through evaporation, annealing, washing, relithiation, and related steps. U.S. Patent US12573678B2 was granted on March 10, 2026, indicating that solid-state battery recycling has entered the stage of protectable engineering technology.
• [18] Another patent family, “Recycling All Solid-State Batteries (ASSBs) and Anode Recovery,” uses passivating substances to help manage charged materials and electrolytes. This reflects the possibility that the first step in all-solid-state recycling may not be conventional “direct shredding,” but rather control of material reactivity before mechanical processing.
• [19] A 2026 study reported mechanical recycling of sulfide all-solid-state batteries using two-stage crushing and separation to obtain an enriched fine fraction described as “grey mass,” with validation on single-layer, multilayer, and industrial-size pouch cells. This is an important signal that research is moving from laboratory unit operations toward more engineering-relevant validation, but it is not equivalent to a mature commercial recycling plant.
• [20] A 2025 Environmental Science & Technology study further compared pyrometallurgical, hydrometallurgical, and direct-recycling routes for oxide-based solid-state batteries using life-cycle assessment (LCA) and multi-criteria decision analysis (MCDA). It showed that there is no universally best route; the result depends on multiple variables including electrolyte, materials, energy consumption, environmental effects, and economics.

Table 3. Where new-battery recycling research and patents currently sit on the maturity spectrum

As of September 2026, the observable industrial situation is closer to “front-end production is moving toward commercialization while recycling technology is catching up” than to “solid-state battery recycling is already mature.” For example, Toyota has publicly targeted market introduction of all-solid-state BEVs in 2027–2028, while QuantumScape inaugurated its Eagle Line in 2026 for pilot production of solid-state lithium-metal batteries. [21][22] As a result, a mature market volume of end-of-life solid-state battery scrap comparable to conventional lithium-ion batteries has not yet emerged. The recycling industry still has a window of time, but it should not wait until the first large wave of retirements before designing its processing lines.

6. Sodium-Ion Batteries: Not a Copy of Lithium-Ion Batteries, but a New Question in Recycling Economics

The industrial significance of sodium-ion batteries is not simply “replace Li with Na.” They provide another route for reducing dependence on lithium resources, but they also bring the recycling industry into a very different economic environment. If cathodes mainly use relatively low-cost elements such as iron and manganese, the value density of recycling can decline further. A dedicated article in Nature Reviews Materials has directly noted that sodium-ion batteries face many environmental and recycling questions similar to those of lithium-ion batteries, while sodium-ion recycling carries greater economic barriers. [23]

However, “low economic value today” does not mean “no need to recycle.” Sodium-ion batteries in China have entered commercialization. In 2025, CATL announced Naxtra as the world’s first mass-produced sodium-ion battery and stated that it had passed certification under China’s revised safety standard for electric-vehicle traction batteries; in 2026, CATL also announced actual deliveries of sodium-ion energy-storage systems and disclosed plans for large-scale capacity and commercial orders in China. [24][25]

Therefore, sodium-ion does not mean “the recycling market will disappear.” Instead, it means “the recycling business model must be repriced.” As the material value of Li, Co, and Ni becomes less dominant, direct recycling, automated pretreatment, low-energy processing, material regeneration, localized recycling, and closed-loop partnerships with battery manufacturers will become more important than simply selling black powder.

Sodium-ion recycling research has also begun to enter the patent stage.

[26] For example, Chinese patent CN115000561A proposes re-sodiating spent sodium-ion cathode material followed by heat treatment so that the material is restored to a target composition; CN118255388A proposes recovering materials such as Al, Fe, and V from sodium-ion battery electrodes through alkaline stripping, solid-liquid separation, acid washing, precipitation, and related steps. This indicates that sodium-ion recycling has moved from a conceptual topic toward process patents for specific chemistries.

7. How Much of Existing Equipment Can Be Shared? Should We Share “Machines” or a “Platform”?

This question is particularly important for existing recyclers. If equipment compatibility is divided into three layers, the first is the mechanical base: conveyors, depackaging, crushing, screening, magnetic separation, density separation, and similar units generally have a relatively high potential for reuse as long as the physical properties of the feedstock have not fundamentally changed. The second layer is control and safety: explosion protection, moisture control, inert gas, H₂S detection, temperature control, and thermal-event management need to be expanded by chemistry-specific modules. The third layer is downstream chemical recovery, where it is generally unsafe to assume that one fixed recipe can process all emerging battery chemistries. [9][15][23]

Table 4. Conceptual compatibility of existing lithium-ion battery recycling equipment with emerging battery chemistries

Therefore, the most valuable investment for the future is not “one fixed line that can process every battery,” but a “rapidly reconfigurable recycling platform”: use a common mechanical platform at the front end, add replaceable safety and sorting modules in the middle, and maintain different process recipes for LFP, NMC/NCA, sulfide solid-state, oxide solid-state, sodium-ion, and other chemistries at the back end. Compared with rebuilding an entire plant every three to five years, this architecture can provide a better path for reducing capital-expenditure risk.

8. The Future Recycling Industry Must Shift from Single-Chemistry Operations to Multi-Chemistry Platforms

If the future battery market simultaneously contains LFP, LMFP, NMC, NCA, semi-solid, all-solid-state, sodium-ion, and potentially lithium-sulfur, lithium-metal, and silicon-carbon-anode technologies, the recycling plant will no longer face a simple “Waste battery → Black Mass” problem. The process becomes “Unknown chemistry → Safe state → Identified stream → Chemistry-specific process → Qualified recovered material.”

Recommended architecture for a multi-chemistry recycling platform

1. First gate: intelligent identification. Build a data layer using cell/module/pack barcodes, QR codes, BMS information, X-ray, and/or rapid spectroscopy or elemental screening to determine form factor, chemistry, SOC/SOH, damage condition, and potential hazards.
2. Second gate: safe-state conversion. Turn “must the battery be deeply discharged, can it be dismantled directly, is an inert environment required, and could H₂S be generated?” into data-driven route decisions rather than applying one fixed SOP to every battery batch.
3. Third gate: modular pretreatment. Design crushing, screening, magnetic separation, density separation, dust collection, and solvent/gas treatment as modular units.
4. Fourth gate: material routing. NMC/NCA can be directed toward Ni/Co/Mn/Li recovery; LFP/LMFP should prioritize material regeneration and relithiation; sodium-ion batteries should be routed according to Na, Fe, Mn, V, Prussian blue analogue (PBA), or layered-oxide chemistry; solid-state batteries should be separated further according to sulfide, oxide, halide, or polymer solid electrolytes.
5. Fifth gate: quality closed loop. Establish specifications for recovered materials covering particle size, Fe/Cu and other impurities, stoichiometry, crystal phase, tap density, electrochemical performance, and traceability, rather than reporting only a “recovery rate.”

9. How Industry, Regulators, and Society Should Respond

Regulation should not focus only on “how many kilograms are recycled,” but also on whether the process can identify different chemistries safely and demonstrate that recovered materials genuinely return to the circular economy. The EU Batteries Regulation is moving in this direction: it establishes material-recovery targets for lithium-based batteries and progressively requires battery-passport information on material composition and critical raw materials. [27]

The U.S. EPA has likewise treated the flammability/reactivity of end-of-life lithium batteries and thermal-runaway management as important practical issues, recommending measures including safety training, terminal isolation, climate control, damaged-battery isolation, fire detection/suppression, thermal imaging, and communication with local fire authorities. [8][28]

Taiwan has also begun moving toward a more detailed recycling-loop design for secondary lithium batteries. In 2025, Taiwan’s Resource Circulation Administration under the Ministry of Environment established qualification rules for responsible enterprises that build their own secondary-lithium-battery recycling loops and apply for preferential fee rates, requiring responsible enterprises to connect users, collection, treatment, and circulation/recycling partners into an integrated loop. In 2026, related waste-dry-cell management rules continued to be revised. This indicates a policy shift from end-of-pipe treatment toward producer responsibility plus circular supply chains. [29][30]

Six policy/industry actions recommended by this article:

1. Incorporate “Design for Recycling” into battery product-design requirements: materials, adhesives, housings, electrodes, solid electrolytes, and pack interconnections should all be accompanied by dismantling and recycling information.
2. Establish battery-chemistry identification standards: recyclers should at minimum be able to rapidly determine chemistry, cell format, electrolyte category, and high-risk constituents.
3. Upgrade recycling KPIs from “weight recovery rate” to “material quality + carbon footprint + reuse rate + safety incident rate.”
4. Encourage modular, multi-chemistry recycling lines: public funding should not only support fixed capacity, but also retrofittability, sensing, digitalization, and safety upgrades.
5. Establish advance end-of-life data mechanisms: OEMs and battery manufacturers should provide, ideally at least 5–10 years in advance, information on chemistry families, production volume, application sectors, and expected EOL waves so recyclers can plan CAPEX using actual data.
6. Establish synchronized regulation for all-solid-state and sodium-ion batteries: do not wait until large retirement volumes emerge before defining hazard classification, transportation, storage, treatment, and recycling standards.

10. Rising Energy Demand and the AI Era: The Value of Recycling Will Extend Beyond “Recovering Materials”

The rapid growth of AI and data centers will further increase power-system demand for highly reliable energy storage. The IEA estimated that global data-center electricity consumption would rise from about 415 TWh in 2024 to around 945 TWh by 2030; its 2026 update also reported that data-center electricity demand grew by 17% in 2025, with AI-focused data centers growing faster. [31][32]

This creates an interesting dual pressure on the battery industry. The front end must produce large volumes of energy-storage equipment more quickly, while the back end must prepare earlier for the material circulation of the next generation of retired equipment. Therefore, the most competitive recyclers of the future may not be the companies with the largest shredders, but those able to integrate energy use, material recovery, carbon data, BMS information, logistics, safety, and sales of secondary materials into one platform.

11. Conclusion: The Next Battery Revolution Should Begin with Design for Recyclability

Looking back from TiS₂ in 1974, to LCO in 1980, the commercialization of lithium-ion batteries in 1991, and onward to LFP, NMC, NCA, LMFP, semi-solid, and all-solid-state batteries, what we actually see is not a straight line but an ever-branching technology tree. Every material advance has increased energy density, reduced cost, or improved safety in some way; but every material change has simultaneously redefined the recycling problem.

Recycling therefore should no longer be treated as the final step in the battery life cycle. It should be incorporated from day one of material selection and product design. If the battery industry continues moving toward higher energy, higher safety, lower cobalt, lower nickel, lower cost, solid-state systems, and sodium-ion technologies, the most important capability of the recycling industry will shift from “large-scale processing” to “rapid identification, routing, low-risk handling, material regeneration, and data closure.”

A truly sustainable battery industry should not ask only, “How long can the battery run?” It should also ask, “After retirement, how well can it be turned back into the next battery?”

Note: This article is a draft technology-trend feature intended for public release. For matters involving regulations, patent scope, waste classification, cross-border transportation, and factory permitting, professional legal, environmental-health-and-safety, and regulatory advice should be obtained based on the target jurisdiction and the actual battery chemistry and product configuration. Patent legal-status information is provided for research reference only and does not constitute a Freedom-to-Operate (FTO) legal conclusion.

References and Source-Location Index

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[25] CATL (2026). Debuts World’s First Field-Validated Sodium-Ion BESS… https://www.catl.com/en/news/6861.html

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Keywords: #LithiumBatteryRecycling #Recyclability #SemiSolidStateBattery #SolidStateBattery #SodiumIonBattery #AIEra #Electrolyte