Zhu Chao, Liu Ziqiang, Wang Jian, Pu Jun, Wu Wenlu, Zhou Qingwen, Zhang Huigang
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures and Institute of Materials Engineering, Nanjing University, Jiangsu, 210093, China.
Small. 2017 Sep;13(34). doi: 10.1002/smll.201701260. Epub 2017 Jul 11.
A novel spinel Co VO is studied as the Li-ion battery anode material and it is sandwiched with a 3D ultralight porous current collector (PCC) and amorphous carbon. Co VO demonstrates the high capacity and excellent cyclability because of the mixed lithium storage mechanisms. The 3D composite structure requires no binders and replaces the conventional current collector (Cu foil) with a 3D ultralight porous metal scaffold, yielding the high electrode-based capacity. Such a novel composite anode also enables the close adhesion of Co VO to the PCC scaffold. The resulting monolithic electrode has the rapid electron pathway and stable mechanical properties, which lead to the excellent rate capabilities and cycling properties. At a current density of 1 A g , the PCC and carbon sandwiched Co VO anode is able to deliver a stable reversible capacity of about 706.8 mAh g after 1000 cycles. Generally, this study not only develops a new Co VO anode with high capacity and good cyclability, but also demonstrates an alternative approach to improve the electrochemical properties of high capacity anode materials by using ultralight porous metallic current collector instead of heavy copper foil.
一种新型尖晶石CoVO被作为锂离子电池负极材料进行研究，它夹在三维超轻多孔集流体（PCC）和非晶碳之间。由于混合的锂存储机制，CoVO展现出高容量和优异的循环稳定性。这种三维复合结构无需粘结剂，用三维超轻多孔金属支架取代了传统集流体（铜箔），产生了基于电极的高容量。这样一种新型复合负极还能使CoVO与PCC支架紧密粘附。所得的整体电极具有快速的电子传输路径和稳定的机械性能，这导致了优异的倍率性能和循环性能。在1 A g的电流密度下，PCC和碳夹在中间的CoVO负极在1000次循环后能够提供约706.8 mAh g的稳定可逆容量。总体而言，这项研究不仅开发了一种具有高容量和良好循环稳定性的新型CoVO负极，还展示了一种通过使用超轻多孔金属集流体而非重铜箔来改善高容量负极材料电化学性能的替代方法。
