Acta Chimica Sinica ›› 2024, Vol. 82 ›› Issue (3): 274-280.DOI: 10.6023/A23100449 Previous Articles     Next Articles



张东彬a,*(), 袁欣然a, 辛亚男b, 刘天豪a, 韩慧果b, 杜光超c, 滕艾均a,*()   

  1. a 鞍钢集团北京研究院有限公司 北京 102211
    b 成都先进金属材料产业技术研究院股份有限公司 成都 610300
    c 攀钢集团研究院有限公司 钒钛资源综合利用国家重点实验室 四川攀枝花 617000
  • 投稿日期:2023-10-14 发布日期:2024-01-04

Research on Preparation of Nano-flake Sodium Vanadyl Phosphate

Dongbin Zhanga(), Xinran Yuana, Yanan Xinb, Tianhao Liua, Huiguo Hanb, Guangchao Duc, Aijun Tenga()   

  1. a Ansteel Beijing Research Institute Co., Ltd., Beijing 102211
    b Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610300
    c Pangang Group Research Institute Co., Ltd., State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, Sichuan 617000
  • Received:2023-10-14 Published:2024-01-04
  • Contact: *E-mail: Zhang); Teng)

Based on the severe preparation conditions, large particle size and poor conductivity, a new method to prepare nano-flake sodium vanadyl phosphate is proposed. By the method of surface energy control technique under specific conditionsion, the controllable preparation of nano-flake sodium vanadyl phosphate was achieved. Through monitoring and analysis of the products under the different growth times, the formation process of nano-flake was studied, and the formation mechanism of sodium vanadyl phosphate was analyzed by density functional theory (DFT) simulation. The microstructure of sodium vanadyl phosphate is studied by adjusting the amount of sulfate radical, to verify the formation mechanism of unique nano-flake sodium vanadyl phosphate. The results show that the adsorption of $\text{SO}_{\text{4}}^{2}$ ions on different crystal faces changes the surface energy of different crystal faces, changes the dominant growth orientation of crystal nuclei, realizes directional growth and self-assembly, and finally gets the unique nano-flake sodium vanadyl phosphate. Because of the unique nano-flake micro-morphology, the prepared nano-flake sodium vanadyl phosphate has higher specific surface area and compaction density. The specific surface area of nano-flake sodium vanadyl phosphate is 16.2 m2/g, and the compaction density is 1.86 g/cm3, which is higher than that of the nano-particle sodium vanadyl phosphate, while 4.3 m2/g for the specific surface area and 1.77 g/cm3 for the compaction density of nano-particle sodium vanadyl phosphate. In addition, nano-flake sodium vanadyl phosphate also shows excellent sodium storage properties. Under the condition of current density at 0.1 C, the discharge specific capacity of nano-flake sodium vanadate phosphate reaches 93.76 mAh/g, which is larger than that of nano- particle sodium vanadyl phosphate (82.85 mAh/g) at the same discharge current density. At the same time, after 100 charge and discharge cycles at 10 C, 105% of the initial capacity can be maintained (in the same condition, only 92% of the initial capacity can be maintained for the nano-particle sodium vanadyl phosphate), showing good cycle stability.

Key words: nano-flake, sodium vanadyl phosphate, controllable preparation, surface energy, oriented growth