Sodium-Ion Battery NFPP Cathode Technology Route Deep Competition: Precursor Method "Winning by Quality", Iron Phosphate Method "Cost Determined by Volume" [SMM Analysis]

SMM August 26 news:

As sodium-ion batteries accelerate penetration in energy storage scenarios, composite sodium iron phosphate (NFPP, Na₄Fe₃(PO₄)₂P₂O₇) has secured its position as the "top contender" among polyanion cathodes, leveraging intrinsic safety, ultra-long cycle life, and resource endowment advantages. However, during industrialisation, two mainstream production routes—the precursor method and the iron phosphate method—are engaged in a long-term trade-off between "performance first" and "cost first." According to SMM survey, these two routes differ significantly in compaction density, cost structure, and supply chain maturity, and their competition will profoundly affect the pace of cost reduction and capacity landscape of sodium-ion battery cathodes.

I. Technology Overview: Process Divergence Determines Inherent Endowment 

NFPP preparation generally follows the main line of "mixing—sand milling—spray drying—high-temperature sintering," with the core divergence lying in the selection of iron and sodium sources. The precursor method starts with a specially prepared sodium-iron-phosphorus composite precursor, which has already achieved molecular-level homogenisation and morphology pre-construction; the downstream only needs sintering for phase formation, and its advantage lies in "innate morphology controllability." The iron phosphate method uses iron phosphate (FePO₄) as the iron source, paired with sodium sources such as sodium carbonate and sodium dihydrogen phosphate. Its process shares commonality with LFP, and the core logic is "to dilute costs through mature supply chain and scale effect."

II. Precursor Method: Performance Advantages but Constrained by Scale and Cost

The core competitive advantage of the precursor method lies in: the prepared cathode performs better in compaction density, capacity utilisation, and particle morphology, with a low process threshold. Enterprises can directly procure precursors for sintering, quickly launch products to attract potential clients for sample verification, and seize the client window in the early stage of industrialisation.

However, the flip side of performance advantages is the current lack of scale effect, resulting in significantly higher costs than the iron phosphate method. More critically, from the supply side, China has few entities that can stably supply precursors, and the overall market supply scale is very limited. The capacity bottleneck in the precursor stage restricts the ramp-up of this route, making it difficult for cost to catch up in the short to medium term. Its strategic value lies in "winning with performance"—leveraging high performance to enter client verification, making it more suitable as a transitional layout for technology positioning and client binding.

III. Iron Phosphate Method: Long-term Mainline for Cost Reduction through Scale

The iron phosphate method follows a "cost first" route, with its cost advantage built on the mature supply of iron phosphate. China has formed a well-established capacity and pricing system, making procurement costs controllable at scale. Mass production line operation, continuous optimization of sintering energy consumption and yield, and the cost space for large-scale production make it the mainstream choice for top-tier players. It highly matches the demands of energy storage scenarios for long cycle life and low cost.

IV. Cost Comparison and Market Outlook

From a cost structure perspective, raw material costs account for the highest proportion and are also the core divergence between the two routes. The precursor route, due to limited precursor supply and manufacturing premiums, operates at the higher end of the cost range; the iron phosphate route, benefiting from ample iron phosphate capacity, has lower costs than the precursor route, and its moat will continue to deepen as capacity is released. Currently, the market price of NFPP cathode and enterprise calculated costs vary significantly due to process differences, and the iron phosphate route has greater potential in "compensating for price with volume."

SMM believes that in the short term, the two routes will operate in parallel, with the precursor route leveraging performance to target high-end customers and client verification, while the iron phosphate route dominates mass production with low cost; in the long term, as iron phosphate route capacity scales up and costs continue to decline, mainstream capacity will converge toward the iron phosphate route, and the precursor route may retreat to high-performance niche segments. The core of cost reduction lies in economies of scale and raw material substitution, while energy storage scaling will be the ultimate judge of route competition—those capable of supplying GWh-level energy storage orders at lower per-ton costs and with more stable supply will prevail. SMM will continue to track the capacity realization and cost evolution of both routes.

SMM New Energy Research Team

Wang Cong 021-51666838

Feng Disheng 021-51666714

Lyu Yanlin 021-20707875