Balogun Muhammad-Sadeeq, Luo Yang, Lyu Feiyi, Wang Fuxin, Yang Hao, Li Haibo, Liang Chaolun, Huang Miao, Huang Yongchao, Tong Yexiang
KLGHEI of Environment and Energy Chemistry, MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , 135 Xingang West Road, Chemical North Building 325, Guangzhou 510275, China.
Instrumental Analysis and Research Centre, Sun Yat-Sen University , Guangzhou 510275, People's Republic of China.
ACS Appl Mater Interfaces. 2016 Apr 20;8(15):9733-44. doi: 10.1021/acsami.6b01305. Epub 2016 Apr 6.
The use of electrode materials in their powdery form requires binders and conductive additives for the fabrication of the cells, which leads to unsatisfactory energy storage performance. Recently, a new strategy to design flexible, binder-, and additive-free three-dimensional electrodes with nanoscale surface engineering has been exploited in boosting the storage performance of electrode materials. In this paper, we design a new type of free-standing carbon quantum dot coated VO2 interwoven nanowires through a simple fabrication process and demonstrate its potential to be used as cathode material for lithium and sodium ion batteries. The versatile carbon quantum dots that are vastly flexible for surface engineering serve the function of protecting the nanowire surface and play an important role in the diffusion of electrons. Also, the three-dimensional carbon cloth coated with VO2 interwoven nanowires assisted in the diffusion of ions through the inner and the outer surface. With this unique architecture, the carbon quantum dot nanosurface engineered VO2 electrode exhibited capacities of 420 and 328 mAh g(-1) at current density rate of 0.3 C for lithium and sodium storage, respectively. This work serves as a milestone for the potential replacement of lithium ion batteries and next generation postbatteries.
使用粉末状的电极材料来制造电池需要粘合剂和导电添加剂，这导致储能性能不尽人意。最近，一种通过纳米级表面工程设计柔性、无粘合剂和无添加剂的三维电极的新策略已被用于提高电极材料的储能性能。在本文中，我们通过一个简单的制造工艺设计了一种新型的独立式碳量子点包覆的VO₂交织纳米线，并展示了其作为锂和钠离子电池阴极材料的潜力。具有高度表面工程灵活性的多功能碳量子点起到了保护纳米线表面的作用，并在电子扩散中发挥重要作用。此外，涂覆有VO₂交织纳米线的三维碳布有助于离子通过内表面和外表面扩散。凭借这种独特的结构，经碳量子点纳米表面工程处理的VO₂电极在0.3 C的电流密度下，锂存储和钠存储的容量分别为420和328 mAh g⁻¹。这项工作是锂离子电池和下一代电池潜在替代的一个里程碑。
