Rational Design of a Trifunctional Binder for Hard Carbon Anodes Showing High Initial Coulombic Efficiency and Superior Rate Capability for Sodium-Ion Batteries,Advanced Functional Materials

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Rational Design of a Trifunctional Binder for Hard Carbon Anodes Showing High Initial Coulombic Efficiency and Superior Rate Capability for Sodium-Ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-07-09 , DOI: 10.1002/adfm.202104137
Ji‐Li Xia ₁ , An‐Hui Lu ₁ , Xiao‐Fei Yu ₁ , Wen‐Cui Li ₁

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Hard carbon (HC) has emerged as a promising anode material for sodium-ion batteries (SIBs), whereas it suffers from low initial Coulombic efficiency (ICE) and poor rate capability. Binders endowed with high electron/ion transport and strong mechanical integrity are expected to boost the practical application of HC anodes, which cannot be realized via the functional design of commercially available binders. Herein, a trifunctional sodium alginate (SA)/polyethylene oxide (PEO) binder with massive hydrophilic functional groups and abundant Na⁺ is synthesized via a feasible esterification reaction. The binder forms a passivation film on glucose-derived carbon (GC) to suppress the electrolyte decomposition and offer stronger adhesion strength. Furthermore, the sluggish Na⁺ conduction is improved via sufficient ionic transfer channels provided by PEO. Notably, effects of Na⁺ compensation and interfacial ionic transport of Na⁺-containing binder for HC anodes are revealed. Therefore, the SA/PEO binder for the GC anode delivers a high ICE up to 87% and a high capacity of 270 mA h g⁻¹ at 0.1 A g⁻¹, both 10% and 80 mA h g⁻¹ higher than that of poly(vinylidene fluoride) binder, respectively. Significantly, this SA/PEO binder can also be applied to coal-based and polymer-based carbon anodes, exhibiting universal applicability.

中文翻译：

具有高初始库仑效率和优异钠离子电池倍率能力的硬碳阳极三功能粘合剂的合理设计

硬碳 (HC) 已成为钠离子电池 (SIB) 的有前途的负极材料，但它的初始库仑效率 (ICE) 低且倍率性能差。具有高电子/离子传输和强机械完整性的粘合剂有望促进 HC 阳极的实际应用，这是通过市售粘合剂的功能设计无法实现的。在此，通过可行的酯化反应合成了具有大量亲水官能团和丰富的 Na ⁺的三官能海藻酸钠 (SA)/聚环氧乙烷 (PEO) 粘合剂。粘合剂在葡萄糖衍生碳 (GC) 上形成钝化膜，以抑制电解质分解并提供更强的粘合强度。此外，缓慢的 Na ⁺通过 PEO 提供的足够的离子传输通道来改善传导。值得注意的是，揭示了用于 HC 阳极的 Na ⁺补偿和含Na ⁺粘合剂的界面离子传输的影响。因此，用于 GC 阳极的 SA/PEO 粘合剂在 0.1 A g ^{-1 时}提供高达 87% 的高 ICE 和 270 mA hg ^-1的高容量，比聚合物高10% 和 80 mA hg ^-1（偏二氟乙烯）粘合剂。值得注意的是，这种 SA/PEO 粘合剂还可以应用于煤基和聚合物基碳阳极，表现出普遍适用性。

更新日期：2021-07-09

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