Preparation method and positive electrode material of quasi-spherical lithium manganese oxide
A technology of spherical lithium manganate and lithium carbonate, which is applied in the direction of manganate/permanganate, battery electrodes, structural parts, etc., can solve problems such as unsatisfactory effects, and achieve ideal high-temperature cycle performance and small particle size.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0024] For the preparation method of spherical-like lithium manganate provided by the embodiment of the present invention, please refer to figure 1 , Which includes the following steps:
[0025] S1. Preparation of manganese dioxide intermediate
[0026] Manganese salt, bicarbonate, aluminum powder, graphene (G) and a solvent are mixed and reacted and filtered, and the filtered solid is heat-treated to obtain a manganese dioxide intermediate. The manganese carbonate microspheres with uniform particle size are obtained by the reaction of manganese salt and bicarbonate under the condition of continuous stirring, which are then transformed into spherical manganese dioxide intermediates after heat treatment.
[0027] Among them, the bicarbonate is selected from any one of ammonium bicarbonate, sodium bicarbonate and potassium bicarbonate, preferably ammonium bicarbonate. The manganese salt is selected from any one of manganese sulfate, manganese sulfate monohydrate, and manganese nitrate...
Embodiment 1
[0040] This embodiment provides a method for preparing spherical-like lithium manganate, which includes the following steps:
[0041] 2.704g MnSO 4 .H 2 O was dissolved in 80 mL of deionized water and 20 mL of ethylene glycol, and then 0.5 g of polyvinylpyrrolidone (PVP) was added to the mixed system, and the first solution was obtained by magnetic stirring for 2 hours. 2.528g NH 4 HCO 3 Dissolve in 30 mL of deionized water, add 0.00192 g of graphene and 0.0039 g of aluminum powder, and stir until clear to obtain a second solution. The second solution was added dropwise to the first solution to gradually produce a milky white precipitate. After stirring the suspension continuously for 1.5 hours, the precipitate was filtered, dried under vacuum at 80°C for 12 hours, and then heated in a muffle furnace at 350°C. Heat treatment 7h under temperature condition (heating rate 0.5℃.min -1 , Air atmosphere), get MnO 2 Intermediate.
[0042] MnO 2 The intermediate and lithium carbonate were...
Embodiment 2
[0044] This embodiment provides a method for preparing spherical-like lithium manganate, which includes the following steps:
[0045] 2.704g MnSO 4 .H 2 O was dissolved in 80 mL of deionized water and 20 mL of ethylene glycol, and then 0.5 g of polyvinylpyrrolidone (PVP) was added to the mixed system, and the first solution was obtained by magnetic stirring for 2 hours. 3.16g NH 4 HCO 3 Dissolve in 30 mL of deionized water, add 0.0192 g of graphene and 0.0043 g of aluminum powder, and stir until clear to obtain a second solution. The second solution was added dropwise to the first solution to gradually produce milky white precipitate. After stirring the suspension continuously for 4 hours, the precipitate was filtered, dried under vacuum at 60°C for 15 hours, and then placed in a muffle furnace at 450°C Heat treatment under the condition of 4h (heating rate 1.5℃.min -1 , Air atmosphere), get MnO 2 Intermediate.
[0046] MnO 2 The intermediate and lithium carbonate were mixed accor...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More