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在微孔碳催化剂中利用功能组,在室温NaS电池中加速硫氧化还原

Shengqiang Zhang¹, Tengdiao Zhang¹, Miao Huang²

¹College of Chemistry & Chemical Engineering, Yan'an University, Yan'an 716000, China.

Journal of colloid and interface science

|September 25, 2025

概括

本研究引入了一种由铜金属有机框架 (Cu-MOF) 制成的新型微孔碳材料,用于室温硫 (RT Na-S) 电池. 该材料有效地抑制了聚硫化物穿,并提高了电化学性能,从而产生了持久,高容量的电池.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

微孔碳是室温-硫 (RT Na-S) 电池的关键硫宿主.
现有的设计往往忽略了短链多硫化物缓慢的氧化还原动力学,导致性能降低.
绝缘Na2S/Na2S2物种的积累阻碍了电池的效率.

研究的目的:

开发一种新的微孔碳材料,以提高RT Na-S电池性能.
为了解决聚硫化物穿和缓慢的氧化还原反应的局限性.
调查功能组在改善硫电池阴极中的作用.

主要方法:

合成由Cu-MOF衍生的微孔碳 (MPC-Cu) 与氧基 (COOH) 和胺基 (CONH2) 组.
孔隙结构和功能组的表征.
密度功能理论 (DFT) 计算和电化学分析以研究Na2Sn吸附,Na+扩散和氧化障碍.

主要成果:

均的0.5-0.8纳米孔有效地限制了小聚硫化物 (S2-4) 并消除了长链聚硫化物穿.
碳化合物组增强了Na2Sn吸附 (Na2S4的约束能量为-1.51 eV),并促进了Na+扩散.
CONH2组显著降低了Na2S氧化屏障,从1.16 eV降至0.70 eV.
S/MPC-Cu阴极表现出良好的长期循环稳定性 (571.5 mAh g-1 在2 A g-1 时,在1000个循环中保持83%) 和速率能力 (504.1 mAh g-1 在5 A g-1).

结论:

具有双重功能组的Cu-MOF衍生微孔碳为高容量,长寿命RT Na-S电池提供了一个有希望的策略.
通过COOH和CONH2组的物理限制和化学催化作用的协同效应对于提高性能至关重要.
这项工作为设计下一代硫电池的先进碳材料提供了一种新的方法.

关键词:

在COOH和CONH中存在2个函数组.微孔碳是一种微孔的碳.在室温硫电池.多硫化是一种多硫化.硫阴极是硫的阴极.

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