Battery cathode material and method for rapidly synthesizing battery cathode material
A positive electrode material and a technology for synthesizing batteries. It is applied in the direction of battery electrodes, batteries, and positive electrodes. It can solve the problems of poor battery performance, slow heating rate, and long holding time, and achieve good crystallinity, improved production efficiency, and small particles. Effect
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Embodiment 1
[0045] (1) The precursor of the lithium-rich manganese-based cathode material prepared by the combustion method is carried out according to the following steps:
[0046] Step 1, 13g of lithium acetate, 5g of nickel acetate and 15g of manganese acetate were dissolved in 50ml of absolute ethanol according to the stoichiometric ratio to form solution A. Solution B was formed by dissolving 21 g of citric acid in 50 ml of absolute ethanol.
[0047] Step 2: Add 250ml of absolute ethanol to the three-necked flask, heat the three-necked flask in an oil bath, add solutions A and B to the three-necked flask simultaneously at a certain rate, stir at a constant speed during the titration, and heat The temperature is 80°C. After the titration, increase the heating temperature of the oil bath to 100°C and stir until dry, then put the three-necked flask into a blast drying oven to dry for a period of time, the heating temperature is 100°C, and the heating time is 12h.
[0048] In step 3, t...
Embodiment 2
[0057] In this example, on the basis of Example 1, Joule heat treatment is also used for the process of removing organic matter in the precursor. At the same time, in order to prevent the precursor from flashing and prevent the precursor from reacting with the electrothermal layer, a barrier layer Al is provided in this embodiment. 2 o 3 (The thickness is 0.65mm, purchased from Foshan Xinghongfei Electronic Technology Company).
[0058] In this example, the carbon cloth with the same size as in Example 1 was used. Due to the setting of the barrier layer, the heating rate was reduced to a certain extent. Before the heat treatment, the carbon cloth with the barrier layer was tested for the heating rate to obtain the current - Heating rate curve, finally determined that the heating rate is 800 at 12A, and 2200°C / min at 19A; the details are as follows:
[0059] Step 1. Lithium acetate and cobalt nitrate are completely dissolved in ultrapure water (both concentrations of lithium ...
Embodiment 3
[0066] To quickly synthesize lithium iron phosphate cathode material, follow the steps below;
[0067] Step 1, Preparation of LiFePO by ball milling 4 Precursor. The specific operation of the whole ball milling process is as follows. First, a certain amount of Li is weighed according to the stoichiometric ratio. 2 CO 3 , FeC 2 o 4 , NH 4 h 2 PO 4 ,sucrose. Weigh a certain amount of steel balls according to the ball-to-material ratio of 20:3, and use a ball mill to grind them for 3-6 hours. During the ball milling process, the speed is kept at 300-450r / min. After ball milling, put the ball-milled precursor powder into a vacuum drying oven and dry under vacuum conditions to obtain LiFePO 4 / C precursor powder.
[0068] Step 2, in this example, carbon cloth purchased from China Taiwan Carbon Energy Technology Co., Ltd. is used for rapid heating, with a size of 1*3cm 2 ; In order to ensure that it reaches the corresponding heating rate, the carbon cloth was tested on th...
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