Zeng Yinxiang, Lai Zhengzhe, Han Yi, Zhang Haozhe, Xie Shilei, Lu Xihong
MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-carbon Chem & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.
School of Environment and Civil Engineering, Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, Dongguan University of Technology, Dongguan, 523808, P. R. China.
Adv Mater. 2018 Jul 1:e1802396. doi: 10.1002/adma.201802396.
The development of high-capacity, Earth-abundant, and stable cathode materials for robust aqueous Zn-ion batteries is an ongoing challenge. Herein, ultrathin nickel cobaltite (NiCo O ) nanosheets with enriched oxygen vacancies and surface phosphate ions (P-NiCo O ) are reported as a new high-energy-density cathode material for rechargeable Zn-ion batteries. The oxygen-vacancy and surface phosphate-ion modulation are achieved by annealing the pristine NiCo O nanosheets using a simple phosphating process. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of active sites, the optimized P-NiCo O nanosheet electrode delivers remarkable capacity (309.2 mAh g at 6.0 A g ) and extraordinary rate performance (64% capacity retention at 60.4 A g ). Moreover, based on the P-NiCo O cathode, our fabricated P-NiCo O //Zn battery presents an impressive specific capacity of 361.3 mAh g at the high current density of 3.0 A g in an alkaline electrolyte. Furthermore, extremely high energy density (616.5 Wh kg ) and power density (30.2 kW kg ) are also achieved, which outperforms most of the previously reported aqueous Zn-ion batteries. This ultrafast and high-energy aqueous Zn-ion battery is promising for widespread application to electric vehicles and intelligent devices.
开发用于坚固的水系锌离子电池的高容量、地球上储量丰富且稳定的阴极材料是一项持续的挑战。在此，报道了具有丰富氧空位和表面磷酸根离子的超薄钴酸镍（NiCo₂O₄）纳米片（P-NiCo₂O₄）作为一种用于可充电锌离子电池的新型高能量密度阴极材料。通过使用简单的磷化工艺对原始NiCo₂O₄纳米片进行退火处理，实现了氧空位和表面磷酸根离子的调控。受益于显著提高的电导率和增加的活性位点浓度，优化后的P-NiCo₂O₄纳米片电极具有出色的容量（在6.0 A g⁻¹时为309.2 mAh g⁻¹）和非凡的倍率性能（在60.4 A g⁻¹时容量保持率为64%）。此外，基于P-NiCo₂O₄阴极，我们制备的P-NiCo₂O₄//Zn电池在碱性电解质中，在3.0 A g⁻¹的高电流密度下具有令人印象深刻的361.3 mAh g⁻¹的比容量。此外，还实现了极高的能量密度（616.5 Wh kg⁻¹）和功率密度（30.2 kW kg⁻¹），这优于大多数先前报道的水系锌离子电池。这种超快且高能量的水系锌离子电池有望广泛应用于电动汽车和智能设备。
