Compared with commercial graphite anode materials for lithium-ion batteries, nano-transition metal oxide anodes have better lithium storage properties and higher theoretical specific capacity, which are more in line with future social development requirements. As far as the transition metal tungsten trioxide is concerned, it is not only eco-friendly, but also low in price and high in theoretical specific capacity. It is undoubtedly a negative electrode material with great development potential. However, bulk tungsten trioxide has low conductivity and large volume changes during charging and discharging, which are the reasons for its limited application in the field of negative electrodes. In response to this problem, this article will introduce a preparation method of cobalt doped nano tungsten oxide anode material.
The specific steps of a method for preparing cobalt-doped nano-tungsten oxide anode material are as follows:
(1) Add ammonium metatungstate, cobalt nitrate, and dimethylimidazole into deionized water to prepare a mixed solution, then use an ultrasonic generator to vibrate and disperse for 1~3h, and adjust the PH value to 1~2, the whole process is at room temperature get on.
(2) Transfer the mixture obtained in step (1) to a reaction kettle for heating, react at 160~180℃ for 4~6 days, then naturally cool to room temperature, take out the mixture, filter, wash, and dry to obtain a powdery substance .
(3) Take out the powder after drying in step (2), quickly raise the temperature to 500~600℃ under the air condition, keep the temperature for 1~2h, after calcination, cool to room temperature along with the furnace.
Note for this production method:
1) In step (1), the molar ratio of ammonium metatungstate, cobalt nitrate, and dimethylimidazole is 5:1:1~6:1:1; the concentration of hydrochloric acid is 1mol/L~2mol/L.
2) In step (2), the heating rate during firing is 7~10℃/min.
Compared with the traditional production method, the synthesis method has the advantages of simple process, low cost, small particle size, special morphology and structure, high specific discharge capacity and excellent cycle performance.
