Lithium-ion battery cathode material and preparation method thereof
A technology for lithium-ion batteries and cathode materials, which is applied in the field of sheet-like nanostructure lithium-ion battery cathode materials and its preparation, can solve problems such as limiting the development and application of lithium manganate, destroying lithium ion transmission channels, and affecting structural stability. Achieve the effects of low implementation cost, environmental friendliness and easy industrialization
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[0016] The technical solution provides a method for preparing a positive electrode material of a lithium-ion battery, comprising the steps of:
[0017] In the first step, according to the stoichiometric ratio, the high-valent manganese salt, the low-valent manganese salt and the oxidizing agent are sequentially dissolved in deionized water, stirred and mixed uniformly to obtain a mixed solution.
[0018] In this step, the stoichiometric ratio is related to the specific materials of the high-valent manganese salt, low-valent manganese salt and oxidizing agent, that is, according to the various materials actually used, the high-valent manganese salt, the low-valent manganese salt and the oxidizing agent are reacted to generate The ratio of the chemical reaction equation when manganese dioxide is used to calculate the amount of high-valent manganese salt, low-valent manganese salt and oxidant. The high-valent manganese salt is permanganate or permanganate water and crystals. Hig...
Embodiment 1
[0033] Dissolve 5.26 grams (g) of potassium permanganate, 0.56 g of manganese sulfate and an appropriate amount of ammonium persulfate into 100 milliliters (mL) of deionized water and stir for 30 minutes (min); pour the resulting dark purple mixture into polytetrafluoroethylene In the prepared hydrothermal tank, seal it with a stainless steel tube and put it into an explosion-proof oven; set the parameters of the explosion-proof oven to 100 degrees Celsius (°C) and keep it warm for 48 hours (h); after the reaction is completed, filter and wash the obtained slurry with deionized water several times ; Put the product in an oven and dry it, and control the drying temperature to 80°C to obtain δ-MnO 2 Powder. Mix lithium hydroxide and manganese dioxide nanosheets into anhydrous acetone according to the stoichiometric ratio, and stir evenly; dry the resulting mixture at room temperature to obtain a powder; place the powder in a vacuum tube furnace Sintering at 400°C for 10 hours; ...
Embodiment 2
[0035]Dissolve 5.26g of potassium permanganate, 0.56g of manganese sulfate and an appropriate amount of ammonium persulfate in 100mL of deionized water and stir for 30 minutes; pour the obtained dark purple mixture into a hydrothermal tank made of polytetrafluoroethylene, and seal it with a stainless steel tube Then put it into an explosion-proof oven; set the parameters of the explosion-proof oven to 130 ° C for 72 hours; after the reaction is completed, filter and wash the obtained slurry with deionized water several times; put the product in an oven to dry, and control the drying temperature to 80 ° C. Get δ-MnO 2 Powder. Mix lithium hydroxide and manganese dioxide nanosheets into anhydrous acetone according to the stoichiometric ratio, and stir evenly; dry the resulting mixture at room temperature to obtain a powder; place the powder in a vacuum tube furnace Sintering at 500°C for 15 hours; the product was washed with deionized water, filtered and dried to obtain the corr...
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