Microstructure, pore accessibility, and sodium storage in hard–soft carbon composites: Implications of hard-carbon precursor morphology
ハードカーボンとソフトカーボンの複合材料における微細構造、細孔アクセス性、およびナトリウム貯蔵: ハードカーボン前駆体形態の影響 (AI 翻訳)
I Ahmed, Hiroyuki Ueda, Anthony E. Somers, Maria Forsyth, Nolene Byrne
🤖 gxceed AI 要約
日本語
本研究では、ナトリウムイオン電池負極材料として有望なハードカーボンとソフトカーボンの複合材料において、ハードカーボンの前駆体形態が微細構造と細孔アクセス性に与える影響を調査した。ソフトカーボン添加により低電圧プラトー容量が減少し、初期クーロン効率が低下する一方、適度な添加（15重量%）でレート性能が向上することを明らかにした。
English
This study investigates how the precursor morphology of hard carbon (HC) influences the microstructure and pore accessibility of HC-soft carbon (SC) composites for sodium-ion battery anodes. SC addition reduces the low-voltage plateau capacity and initial Coulombic efficiency, while moderate SC addition (15 wt%) improves rate capability. The results show that electrochemical performance is controlled by the morphology-dependent accessibility of low-voltage sodium storage domains.
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
ナトリウムイオン電池はリチウムイオン電池の代替として資源制約の少ない蓄電技術であり、日本のGX政策（蓄電池産業戦略、エネルギー貯蔵システムの普及）に直結する。本結果は、実用化に向けた電極材料設計に重要な知見を提供する。
In the global GX context
Sodium-ion batteries are gaining attention for grid storage and EV applications as a resource-abundant alternative to lithium-ion. This paper provides insights into electrode material design that can enhance performance, supporting the global energy transition and decarbonization of the power and transport sectors.
👥 読者別の含意
🔬研究者:Provides mechanistic understanding of HC-SC composite anode behavior, crucial for designing high-performance SIBs.
🏢実務担当者:Guidance on optimizing HC precursor and SC ratio to balance capacity and rate performance in SIB anodes.
🏛政策担当者:Supports development of cost-effective sodium-ion batteries, aligning with energy storage deployment targets.
📄 Abstract（原文）
Hard carbon (HC) is a leading anode material for sodium-ion batteries (SIBs), and combining HC with soft carbon (SC) has been widely explored to tune electrochemical performance. However, it remains unclear how the precursor morphology of HC influences the microstructure ordering and pore accessibility of HC-SC composites and, consequently, their sodium storage behaviour. In this study, HC derived from microcrystalline cellulose (MCC) was co-carbonised with pitch-derived SC to produce composites with varying HC/SC ratios, which were evaluated under identical electrochemical conditions. Structural characterisation shows that SC addition modifies the degree of structural ordering in the carbon matrix, while Raman analysis indicates that the overall defect population remains largely unchanged across the series. Gas adsorption and NMR wetting experiments further reveal that SC addition restricts access to confined pore domains within the HC framework, limiting sodium storage in the low-voltage plateau region. Electrochemically, the sloping capacity and diffusion coefficients remain broadly similar across the composites, whereas the low-voltage plateau capacity and initial Coulombic efficiency (ICE) progressively decrease with increasing SC content. Furthermore, rate capability improves with moderate SC addition, with the MCC HC-SC composite containing 15 wt% SC delivering the highest rate performance (117 mAh g<sup>-1</sup> at 500 mA g<sup>-1</sup>). These results show that the electrochemical response of HC–SC composites is not universal but is controlled by the morphology-dependent accessibility and the utilisation of low-voltage sodium storage domains.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.26187/deakin.32682498first seen 2026-06-18 05:16:35
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