南京航空航天大学彭生杰团队报道了高性能钾离子电池中多通道碳基质中锡亚纳米团簇的封装。相关研究成果发表在2024年8月7日出版的《德国应用化学》。

具有超小粒径的亚纳米簇对于制造先进的储能材料特别重要。

该文中，封装在氮掺杂多通道碳基质中的Sn亚纳米簇（表示为Sn-SCs@MCNF)通过简单可控的路线设计，作为高性能钾离子电池（PIBs）的柔性阳极。可以精确地识别多通道碳基体中均匀分散的Sn亚纳米簇，这确保阐明尺寸对电化学性能的影响。亚纳米级效应Sn-SCs@MCNF抑制电极粉碎并增强K⁺扩散动力学，从而获得优异的循环稳定性和速率性能。

作为PIBs中的独立阳极，Sn-SCs@MCNF表现出优异的K⁺存储性能，如优异的循环稳定性（在100mA g^-1下150次循环后为331mAh g^-1）和倍率能力。尤其是Sn-SCs@MCNF||KFe[Fe(CN)₆]全电池即使在200次循环后，在0.4A g^-1下也显示出令人印象深刻的167mAh g^-1的可逆容量。

理论计算表明，超细Sn亚纳米簇有利于电子转移，有助于降低中间体的能量势垒，从而带来有前景的电化学性能。通过原位分析，对Sn-SCs@MCNF的本征K+储存过程进行了全面的研究。

该项工作为设计用于高性能储能装置的亚纳米级功能材料提供了重要指导。

附：英文原文

Title: Encapsulation of Sn Sub-nanoclusters in Multichannel Carbon Matrix for High-Performance Potassium-ion Batteries

Author: Linlin Li, Aoming Huang, Hongcheng Jiang, Yan Li, Xiansong Pan, Tsung-Yi Chen, Han-Yi Chen, Shengjie Peng

Issue&Volume: 2024-08-07

Abstract: Sub-nanoclusters with ultra-small particle sizes are particularly significant to create advanced energy storage materials. Herein, Sn sub-nanoclusters encapsulated in nitrogen-doped multichannel carbon matrix (denoted as Sn-SCs@MCNF) are designed by a facile and controllable route as flexible anode for high-performance potassium ion batteries (PIBs). The uniformly dispersed Sn sub-nanoclusters in multichannel carbon matrix can be precisely identified, which ensure us to clarify the size influence on the electrochemical performance. The sub-nanoscale effect of Sn-SCs@MCNF restrains electrode pulverization and enhances the K+ diffusion kinetics, leading to the superior cycling stability and rate performance. As freestanding anode in PIBs, Sn-SCs@MCNF manifests superior K+ storage properties, such as exceptional cycling stability (331 mAh g1 after 150 cycles at 100 mA g1) and rate capability. Especially, the Sn-SCs@MCNF||KFe[Fe(CN)6] full cell demonstrates impressive reversible capacity of 167 mAh g1 at 0.4 A g1 even after 200 cycles. Theoretical calculations clarify that the ultrafine Sn sub-nanoclusters are beneficial for electron transfer and contribute to the lower energy barriers of the intermediates, thereby resulting in promising electrochemical performance. Comprehensive investigation for the intrinsic K+ storage process of Sn-SCs@MCNF is revealed by in situ analysis. This work provides vital guidance to design sub-nanoscale functional materials for high-performance energy-storage devices.

DOI: 10.1002/anie.202412077

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202412077