Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, P.R. China.
Collaborative Innovation Center of Electric Vehicles in Beijing , Beijing 100081, P.R. China.
ACS Appl Mater Interfaces. 2016 Jul 27;8(29):18832-40. doi: 10.1021/acsami.6b04687. Epub 2016 Jul 18.
Tuning hierarchical micro/nanostructure of electrode materials is a sought-after means to reinforce their electrochemical performance in the energy storage field. Herein, we introduce a type of hierarchical mesoporous Li[Li0.2Ni0.2Mn0.6]O2 microsphere composed of nanoparticles synthesized via an ice templating combined coprecipitation strategy. It is a low-cost, eco-friendly, and easily operated method using ice as a template to control material with homogeneous morphology and rich porous channels. The as-prepared material exhibits remarkably enhanced electrochemical performances with higher capacity, more excellent cycling stability and more superior rate property, compared with the sample prepared by conventional coprecipitation method. It has satisfactory initial discharge capacities of 280.1 mAh g(-1) at 0.1 C, 207.1 mAh g(-1) at 2 C, and 152.4 mAh g(-1) at 5 C, as well as good cycle performance. The enhanced electrochemical performance can be ascribed to the stable hierarchical microsized structure and the improved lithium-ion diffusion kinetics from the highly porous structure.
调谐电极材料的分级微/纳结构是增强其储能领域电化学性能的一种有效手段。本文采用冰模板结合共沉淀策略合成了一种由纳米颗粒组成的分级介孔 Li[Li0.2Ni0.2Mn0.6]O2 微球，该方法具有成本低、环保且易于操作的特点，使用冰作为模板来控制材料的均匀形态和丰富的多孔通道。与采用传统共沉淀法制备的样品相比，所制备的材料具有显著增强的电化学性能，表现出更高的容量、更优异的循环稳定性和更优越的倍率性能。该材料在 0.1 C 时具有 280.1 mAh g(-1)的初始放电容量，在 2 C 时为 207.1 mAh g(-1)，在 5 C 时为 152.4 mAh g(-1)，且具有良好的循环性能。增强的电化学性能可归因于稳定的分级微结构和高多孔结构改善的锂离子扩散动力学。
