Lehn Institute of Functional Materials, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, China.
Department of Chemistry and Applied Biosciences, ETH Zurich, 8093, Zurich, Switzerland.
Small. 2016 May;12(17):2365-75. doi: 10.1002/smll.201600106. Epub 2016 Mar 7.
The capacity of anode materials plays a critical role in the performance of lithium-ion batteries. Using the nanocrystals of oxygen-free metal-organic framework ZIF-67 as precursor, a one-step calcination approach toward the controlled synthesis of CoO nanoparticle cookies with excellent anodic performances is developed in this work. The CoO nanoparticle cookies feature highly porous structure composed of small CoO nanoparticles (≈12 nm in diameter) and nitrogen-rich graphitic carbon matrix (≈18 at% in nitrogen content). Benefiting from such unique structure, the CoO nanoparticle cookies are capable of delivering superior specific capacity and cycling stability (1383 mA h g(-1) after 200 runs at 100 mA g(-1) ) over those of CoO and graphite.
作为锂离子电池性能的关键因素之一，阳极材料的容量起着重要作用。本工作采用无定形金属-有机骨架 ZIF-67 的纳米晶作为前体，通过一步煅烧法可控合成具有优异阳极性能的 CoO 纳米颗粒曲奇。CoO 纳米颗粒曲奇具有高度多孔结构，由小 CoO 纳米颗粒（直径约为 12nm）和富氮石墨碳基质（氮含量约为 18at%）组成。受益于这种独特的结构，CoO 纳米颗粒曲奇能够提供更高的比容量和循环稳定性（在 100mA/g 的电流密度下，经过 200 次循环后，仍可保持 1383mA h/g 的比容量），优于 CoO 和石墨。
