通过对联体芳香度操纵,提高基于Sn的协调聚合物的离子运输动力学
Jialong Jiang1, Runhao Zhang1, Tiankai Sun1
1Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE) and Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China.
Inorganic chemistry
|September 28, 2023
概括
研究人员开发了基于锡的新型协调聚合物,用于增强离子电池阳极. 芳香配体通过增加活性位点利用率和电荷转移来提高性能,为先进的电池材料提供了一种新策略.
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
- 协调化学 协调化学
背景情况:
- 基于锡的化合物对离子电池阳极有希望,因为它们的低压和高容量.
- 挑战包括循环过程中的大量扩张和复杂的合成方法.
- 有机矩阵的协调网络可以减轻体积膨胀并增强储存.
研究的目的:
- 开发一种简单的方法来合成用于储存的基协调聚合物.
- 为了研究连接剂芳香度对这些材料电化学性能的影响.
- 了解的储存机制和体积膨胀行为.
主要方法:
- 简单合成两种一维的基于Sn的协调聚合物:[Sn(Hcta) (1) 和[Sn(Hbtc) ] (2).
- 电化学表征以评估储存性能 (可逆容量,循环稳定性).
- 密度函数理论 (DFT) 计算和详细表征以研究反应机制和体积变化.
主要成果:
- 含有芳香联体的聚合物[Sn(Hbtc) ] (2) 在160个循环中表现出更高的可逆容量 (833 mAh g-1在200 mA g-1上) 与非芳香的[Sn(Hcta) ] (1) 相比.
- 发现连接剂的芳香性可以提高活性部位的利用率,并促进快速的电荷转移.
- DFT计算阐明了可逆储存反应和体积膨胀动态.
结论:
- 配体芳香度是设计高性能Sn基协调聚合物阳极的关键结构因素.
- 这些材料为开发用于离子电池的先进阳极材料提供了一个有前途的协调化学策略.
- 该研究提供了对优化基于Sn的材料的见解,通过控制联结体结构来改善电化学特性.
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