Targeted Etching Strategy to Expand Low-Voltage Plateau of Pitch-Based Hard Carbon for Sodium Storage
ピッチ由来ハードカーボンの低電圧プラトー拡張のためのターゲットエッチング戦略によるナトリウム貯蔵 (AI 翻訳)
Danjun Wang, Siyuan Tan, Zhiyuan Cheng, Jiahao Xing, Zhibin Wu, Jie Li, Yanqing Lai, Jingqiang Zheng, Simin Li, Zhian Zhang
🤖 gxceed AI 要約
日本語
本研究は、ナトリウムイオン電池用ピッチ由来ハードカーボン負極において、CO2エッチングと高温炭化の組み合わせにより低電圧プラトー容量を拡大し、サイクル安定性を向上させた。前酸化で導入したC-O/C=O基が均一なナノ細孔形成を促進し、CO2エッチングでマイクロ細孔を拡張、閉細孔を形成することで、高容量（347.6 mAh/g）と高初期クーロン効率（90%）を達成。ナトリウム貯蔵は吸着・インターカレーション・細孔充填の三相機構であり、閉細孔工学の重要性を提示。
English
This study reports a targeted etching strategy combining CO2-assisted etching and high-temperature carbonization to expand the low-voltage plateau capacity of pitch-derived hard carbon anodes for sodium-ion batteries. Preoxidation introduces C-O/C=O groups enabling uniform nanopore formation, and subsequent CO2 etching at 800°C selectively expands micropores while reducing oxygen content. The final material achieves a high reversible capacity of 347.6 mAh g⁻¹ with 90% initial Coulombic efficiency and 87.3% capacity retention after 200 cycles, highlighting closed-pore engineering for enhanced sodium storage performance.
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
日本のGX文脈では、エネルギー貯蔵は再生可能エネルギー普及の要であり、ナトリウムイオン電池はリチウム代替として注目。本材料研究は低コスト・高安定蓄電池の基盤となり得るが、実用化にはさらなる大規模検証が必要。
In the global GX context
Globally, sodium-ion batteries are emerging as a low-cost alternative for stationary energy storage, critical for integrating renewables. This materials science advance on pitch-derived hard carbon anodes (using cheap precursor) supports the energy transition by demonstrating improved plateau capacity and cycling stability, though it remains at laboratory scale.
👥 読者別の含意
🔬研究者:New insight into closed-pore engineering for sodium-ion battery anodes, offering a pathway to improve plateau capacity and cycling stability.
📄 Abstract（原文）
To address the lack of voltage plateau, low plateau capacity, and poor cycling stability in pitch-derived carbon anodes, a hard carbon material was synthesized via CO 2 -assisted etching combined with high-temperature carbonization of preoxidized pitch. Preoxidation introduces C–O/C═O groups into pitch, suppressing its pyrolysis melting and enabling uniform nanopore formation. Subsequent CO 2 etching at 800 °C selectively expands micropores while reducing oxygen content (from 14.94% to 8.05%), and final carbonization further converts open pores into closed pores. These integrated strategies endow the material with outstanding sodium storage performance, achieving an initial Coulombic efficiency of 90%, a reversible capacity of 347.6 mAh g –1 (including a plateau capacity of 249.4 mAh g –1 ), and 87.3% capacity retention after 200 cycles at 100 mA g –1 . The enhanced stability originates from the formation of a thin solid electrolyte interphase with organic–inorganic gradient structure and a triphasic mechanism involving adsorption (>0.10 V), intercalation (0.01–0.10 V), and pore filling (<0.01 V), highlighting the critical role of closed-pore engineering of pitch-derived hard carbon for high-performance sodium-ion batteries (SIBs).
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acsami.6c06386first seen 2026-06-24 04:48:11
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