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Breaking Rate‐Limit of Na <sub>4</sub> Fe <sub>3</sub> (PO <sub>4</sub> ) <sub>2</sub> P <sub>2</sub> O <sub>7</sub> by Quasi‐ALD Derived Ultra‐Low Carbon Coating in High‐Rate Sodium‐Ion Batteries

準ALD法による超低炭素コーティングでNa4Fe3(PO4)2P2O7のレート制限を打破する高レートナトリウムイオン電池 (AI 翻訳)

Anyu Hu, Zekai Wei, Guoxing Wei, Depei Zhang, Yanpeng Fu, Changbao Zhu, Zhicong Shi, Yong Yang

Advanced Functional Materials📚 査読済 / ジャーナル2026-07-03#EV・輸送Origin: CN経営インパクト: コスト削減対象セクター: automotive
DOI: 10.1002/adfm.76750
原典: https://doi.org/10.1002/adfm.76750

🤖 gxceed AI 要約

日本語

本研究は、ナトリウムイオン電池の正極材料Na4Fe3(PO4)2P2O7 (NFPP)に対して、前駆体誘起準ALD炭素析出戦略を用いて超薄・均一な炭素コーティングを施し、電子伝導性とNa+拡散速度を向上させた。これにより、200Cで58 mAh g⁻¹の高レート性能と、20Cで20,000サイクル後83.2%の容量維持率を達成し、-20°Cでも優れた性能を示した。この成果は低コスト・高安全性のナトリウムイオン電池の実用化に貢献する。

English

This study proposes a precursor-induced quasi-ALD carbon deposition strategy to fabricate high-power, stable NFPP@C-FAC cathodes for sodium-ion batteries. The ultrathin, uniform carbon coating with only 1.5% carbon content enhances electronic conductivity and interfacial Na+ diffusion kinetics, achieving excellent rate capability (58 mAh g⁻¹ at 200 C) and cycling stability (83.2% retention after 20,000 cycles at 20 C). The material also performs well at low temperatures (-20°C), supporting the development of low-cost, safe sodium-ion batteries for energy storage and electric vehicles.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本では、電気自動車（EV）や再生可能エネルギー貯蔵の需要拡大に伴い、リチウムイオン電池に代わる低コスト・高安全な蓄電池技術の開発が急務である。本研究成果は、資源制約の少ないナトリウムイオン電池の実用化を前進させ、日本のGX戦略における蓄電池サプライチェーンの多様化に寄与する可能性がある。

In the global GX context

Globally, sodium-ion batteries are gaining attention as a cheaper and more sustainable alternative to lithium-ion batteries for grid storage and EVs. This paper demonstrates a significant performance breakthrough in NFPP cathode materials using a novel coating technique, contributing to the advancement of next-generation battery technology. The quasi-ALD method offers a scalable path to high-rate, durable electrodes, which is crucial for the energy transition.

👥 読者別の含意

🔬研究者:This paper provides a novel carbon coating method (quasi-ALD) that dramatically improves the rate capability and cycling stability of NFPP cathodes, offering a viable path for high-performance sodium-ion batteries.

🏢実務担当者:The demonstrated coating technique could be adopted by battery manufacturers to produce low-cost, high-rate sodium-ion batteries for applications such as electric vehicles and grid storage.

🏛政策担当者:Advancements in sodium-ion battery technology support energy storage diversification and reduce dependence on critical minerals like lithium, aligning with policies promoting supply chain resilience and decarbonization.

📄 Abstract（原文）

ABSTRACT Carbon coating is a key strategy to enhance electron transport for polyanionic cathode materials. However, current carbon‐coating methods face challenges in simultaneously achieving ultrathin, continuous, and highly conductive coatings with low carbon content, to enable efficient coupled ion–electron transport. As for Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 (NFPP), it still suffers from the above issues, limiting its electrochemical performance and industrial application. Commercial atomic layer deposition (ALD) technology is highly precise but unsuitable for carbon coatings and requires costly specialized equipment. Here, a precursor‐induced quasi‐ALD carbon deposition strategy is proposed to fabricate high‐power, stable NFPP@C‐FAC cathodes, using molecular‐level coupling of Fe and C sources. The obtained carbon matrix exhibits an ultrathin, uniform coating with an ultra‐low carbon content of 1.5% and few defects. These properties increase the electronic conductivity and the interfacial Na + diffusion kinetics, thereby improving the coupled ion–electron transport, as confirmed by DFT calculations. NFPP@C‐FAC demonstrates excellent rate performance (58 mAh g −1 at 200 C) and exceptional cycling stability, with 83.2% capacity retention after 20 000 cycles at 20 C. Moreover, NFPP@C‐FAC exhibits superior performance over a wide temperature range, which shows 90% capacity retention at −20°C compared to room temperature, with a single‐phase solid‐solution reaction mechanism confirmed by in situ XRD.

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