高性能钠离子电池酯化交联树脂基硬碳微观结构调控,Inorganic Chemistry Frontiers

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高性能钠离子电池酯化交联树脂基硬碳微观结构调控
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2023-03-20 , DOI: 10.1039/d3qi00052d
Huanyu Zhou ₁ , Ning Sun ₁ , Jiaxu Yu ₁ , Razium Ali Soomro ₁ , Shaohong Zhang ₁ , Bin Xu ₁

Affiliation

酚醛树脂（PF）是一种常见的碳前驱体，成本低廉，含碳量丰富。然而，PF衍生的碳通常具有相对较高的结构规则性和较小的层间空间，导致电化学储钠能力较差。在这项工作中，将 3,4,9,10-苝-四羧酸二酐 (PTCDA) 引入 PF 中，通过酯化交联反应调节 PF 衍生的碳微结构，以提高其储钠性能。PTCDA 的整合有效地增强了树脂分子链的热稳定性，消除了缺陷，并限制了碳化过程中石墨化区域的生长，使代表性的 PPFC-1-6-1200 具有 0.394 nm 的扩展层间距但较低的比表面积为 4.8 m²克^-1。当用作钠离子电池 (SIB) 的负极材料时，PPFC-1–6–1200 可提供 308.7 mA hg^-1的可逆容量，初始库仑效率 (ICE) 为 77.9%，远优于原始电池^{PF 衍生的碳材料具有 163.3 mA hg -1}的有限容量和 73.9% 的 ICE。此外，PPFC-1-6-1200 在 0.5 C 下 300 次充放电循环中表现出优异的循环和倍率性能，容量保持率为 90.4%，表明 PTCDA 改性是调节微观结构和改善电化学钠存储的有效方法碳材料的特性。

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Microstructure regulation of resin-based hard carbons via esterification cross-linking for high-performance sodium-ion batteries

Phenolic resin (PF) is a common carbon precursor with low cost and rich carbon content. However, PF-derived carbon is often characterized by a relatively high degree of structural regularity and small interlayer spaces, resulting in poor electrochemical Na-storage ability. In this work, 3,4,9,10-perylene-tetracarboxylic acid-dianhydride (PTCDA) was introduced in PF to regulate the PF-derived carbon microstructures by an esterification cross-linking reaction to improve their Na-storage performance. The integration of PTCDA efficiently enhanced the thermal stability of the resin molecular chain, eliminated defects, and limited the growth of the graphitized domain during the carbonization process, allowing the representative PPFC-1–6–1200 to have an expanded interlayer distance of 0.394 nm but a lower specific surface area of 4.8 m² g⁻¹. When being used as an anode material for sodium-ion batteries (SIBs), PPFC-1–6–1200 delivered a reversible capacity of 308.7 mA h g⁻¹ with an initial coulombic efficiency (ICE) of 77.9%, much superior to the pristine PF-derived carbon materials with a limited capacity of 163.3 mA h g⁻¹ and an ICE of 73.9%. Moreover, PPFC-1–6–1200 exhibited excellent cycling and rate performance with a capacity retention of 90.4% during 300 charge/discharge cycles at 0.5 C, suggesting that PTCDA modification is an effective method to regulate the microstructure and improve the electrochemical sodium storage properties of carbon materials.

更新日期：2023-03-22

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