Method for preparing lithium ferrosilicon silicate of lithium-ion battery cathode material
A technology for lithium ferrous silicate and lithium-ion batteries, which is applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems that the electronic conductivity and tap density are difficult to increase at the same time, and are difficult to meet, and achieve excellent microscopic Structure, structural stability, high safety effect
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[0023] The present invention relates to a method for preparing lithium iron silicate, a cathode material of a lithium ion battery, and the steps are as follows:
[0024] 1. Mix lithium salt, ferrous salt, silicon dioxide and additives in proportions (the mixing process can be carried out in conventional mixing equipment, such as inclined mill, cone mixer, three-dimensional mixer, and mix for 1 to 24 hours; Wet chemical methods can also be used, such as sol-gel method, spray drying method for mixing), wherein the molar ratio of Li:Fe:Si is (1.9-2.1):(0.95-1.05):1 and the additive amount is the mixture 1-30% of the total mass;
[0025] The above additives can be carbon black, graphite or organic compounds that can be decomposed into conductive carbon substances after pyrolysis;
[0026] 2. Put the uniformly mixed raw materials into the heat treatment equipment (any heat treatment equipment that can uniformly heat the reaction mixture under the protection of the atmosphere can be use...
Example Embodiment
[0031] Example 1:
[0032] 2.7 g of lithium silicate, 5.4 g of ferrous oxalate, and 2 g of sucrose were mixed and ball milled in an ethanol medium for 24 hours. The equipment used was a planetary ball mill and the autobiographical speed was 200 r / min. The well-mixed and ground mixed powder was dried in vacuum at 60°C for 24 hours, and then pressed into tablets at a pressure of 10MPa. Under the protection of an argon atmosphere of 1L / min, the temperature was increased to 400°C at a rate of 10°C / min. Incubate for 2 hours, then increase to 800°C at a rate of 10°C / min, hold at this temperature for 10 hours, and then cool to room temperature to obtain a lithium iron silicate sample.
[0033] figure 1 In order to obtain the XRD pattern of lithium iron silicate, most of the diffraction peaks in the figure can correspond to the characteristic peaks of lithium iron silicate, and there are also a small amount of impurities. figure 2 In the scanning electron micrograph of the obtained lit...
Example Embodiment
[0035] Example 2:
[0036] 2.85g of lithium carbonate, 2.3g of silicon dioxide, 5.4g of ferrous oxalate and 2g of sucrose were mixed and ball milled in an ethanol medium for 24 hours. The equipment used was a planetary ball mill, and the autopilot speed was 250r / min. The well-mixed and ground mixed powder was vacuum dried at 60°C for 24 hours, and then pressed into tablets at a pressure of 10MPa. Under the protection of an argon atmosphere of 2L / min, the temperature was increased to 400°C at a rate of 10°C / min. Incubate for 2 hours, then increase to 850°C at a rate of 20°C / min, hold at this temperature for 15 hours, and then cool to room temperature to obtain a lithium iron silicate sample. Test its electrochemical performance according to the method of Example 1, such as Figure 5 As shown, its first-cycle reversible capacity is 142mAh / g.
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