Man Zhang , Jing Zhu , Qianqian Li , Fenghua Zheng , Sijiang Hu , Youguo Huang , Hongqiang Wang , Xing Ou , Qichang Pan , Qingyu Li
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More importantly, the fundamental mechanism of improved structure stability is unveiled by simulations and experimental results simultaneously. It demonstrates that this designed multidimensional flower-like architecture with dispersed nanorods can balance the structural mismatch, avoid concentrated local strain, and relax the internal stress, mainly induced by the unavoidable volume variation during the repeated conversion processes. Moreover, it can provide more Na<sup>+</sup>-storage sites and multi-directional migration pathways, leading to a fast Na<sup>+</sup>-migration channel with boosted reaction kinetic. As expected, it delivers superior rate performance (441 mA h g<sup>−1</sup> at 5.0 A g<sup>−1</sup>) and long cycling stability (563 mA h g<sup>−1</sup> at 1.0 A g<sup>−1</sup> over 1000 cycles) for SIBs. 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引用次数: 0
摘要
应力累积是导致基于 NiSe2 的阳极储钠性能下降的关键因素。因此,在钠离子电池(SIB)的钠硒基材料中,抑制钠硒基阳极在钠化/解钠过程中的局部应力集中至关重要。本文提出了一种由结构工程驱动的应力消散策略,可实现超快和超长的钠存储特性。与传统的球状或棒状结构不同,三维(3D)花朵状 NiSe2@C 复合材料经过精心设计,并与一维纳米棒和碳框架组装在一起。更重要的是,模拟和实验结果同时揭示了提高结构稳定性的基本机制。实验结果表明,这种带有分散纳米棒的多维花状结构设计可以平衡结构失配,避免局部应变集中,并放松内应力,内应力主要是由反复转换过程中不可避免的体积变化引起的。此外,它还能提供更多的 Na+ 储存位点和多向迁移途径,从而形成快速的 Na+ 迁移通道,并提高反应动力学。正如预期的那样,它为 SIB 提供了卓越的速率性能(5.0 A g-1 时为 441 mA h g-1)和长期循环稳定性(1.0 A g-1 时为 563 mA h g-1,循环 1000 次)。这项工作为设计用于 SIB 的高性能转换型阳极材料提供了有益的启示。
Effective stress dissipation by multi-dimensional architecture engineering for ultrafast and ultralong sodium storage
Stress accumulation is a key factor leading to sodium storage performance deterioration for NiSe2-based anodes. Therefore, inhibiting the concentrated local stress during the sodiataion/desodiation process is crucial for acquiring stable NiSe2-based materials for sodium-ion batteries (SIBs). Herein, a stress dissipation strategy driven by architecture engineering is proposed, which can achieve ultrafast and ultralong sodium storage properties. Different from the conventional sphere-like or rod-like architecture, the three-dimensional (3D) flower-like NiSe2@C composite is delicately designed and assembled with one-dimensional nanorods and carbon framework. More importantly, the fundamental mechanism of improved structure stability is unveiled by simulations and experimental results simultaneously. It demonstrates that this designed multidimensional flower-like architecture with dispersed nanorods can balance the structural mismatch, avoid concentrated local strain, and relax the internal stress, mainly induced by the unavoidable volume variation during the repeated conversion processes. Moreover, it can provide more Na+-storage sites and multi-directional migration pathways, leading to a fast Na+-migration channel with boosted reaction kinetic. As expected, it delivers superior rate performance (441 mA h g−1 at 5.0 A g−1) and long cycling stability (563 mA h g−1 at 1.0 A g−1 over 1000 cycles) for SIBs. This work provides useful insights for designing high-performance conversion-based anode materials for SIBs.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy