Positive electrode material and preparation method thereof and lithium ion battery
A cathode material and mixing technology, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems that restrict the wide application, cycle, rate and stability of lithium-rich manganese-based cathode materials, and achieve The effect of improving electrochemical performance, increasing energy density, and improving structural stability
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[0038] According to another exemplary embodiment of the present invention, a method of preparing a positive electrode material is provided, the method comprising:
[0039] S1. Get precursor, the chemical formula of the precursor is Ni x Mn y(OH) 2 Wherein, 0 ≤ x 0.5, 0.5 <1;
[0040] As an alternative embodiment, the precursor is specifically included,
[0041] S1.1. Mix the ammonia solution and sodium hydroxide solution to obtain a precipitant solution;
[0042] Specifically, the ammonia solution and sodium hydroxide solution are mixed to obtain a precipitant solution, the mass fraction of the ammonia solution is 5% -10%, and the molar concentration of the sodium hydroxide solution is 0.5mol / L. -1 mol / L, with volumetric meter, the ratio of sodium hydroxide solution and an aqueous ammonia solution of 0.5 to 1: 10-20.
[0043] S1.2. Among the water in water, a transition metal salt solution is obtained in water.
[0044] Specifically, a nickel salt and a manganese salt solution...
Embodiment 1
[0059] (1) Gas a 5% aqueous solution of 5% is added 200ml of a well-formed 10 ml of molar concentration of 0.5 mol / L / L, and stir it, resulting in a precipitant solution;
[0060] (2) 2.6285 g of hexahydride sulfate and 6.7604 g of manganese sulfate is dissolved in 100 ml of deionized water, configured to mix the solution to obtain a transition metal salt solution;
[0061] (3) Configuring the precipitating agent solution in step one is added to the metal salt solution of 1 ml / min, during the addition of the reaction temperature, the reaction temperature of 80 ° C is maintained, constantly stirring, and after the reaction is completely completed. The precipitate material is filtered, washed, dried, and the transition metal hydroxide precursor Tm was prepared by coprecipitation method. 0.2 Mn 0.8 (OH) 2 (TM is Ni element, 0 ≤ x <0.5, 0.5 <1);
[0062] (4) Weigh 1.757 g of dry precursor, 0.063 g of fluoride fluoride and 1.031 g of hydrated hydroxide according to transition meta...
Embodiment 2
[0064] (1) Gas a 5% aqueous solution of 5% is added 200ml of a well-formed 10 ml of molar concentration of 0.5 mol / L / L, and stir it, resulting in a precipitant solution;
[0065] (2) 2.6285 g of hexahydride sulfate and 6.7604 g of manganese sulfate is dissolved in 100 ml of deionized water, configured to mix the solution to obtain a transition metal salt solution;
[0066] (3) Configuring the precipitating agent solution in step one is added to the metal salt solution of 1 ml / min, during the addition of the reaction temperature, the reaction temperature of 80 ° C is maintained, constantly stirring, and after the reaction is completely completed. The precipitate material is filtered, washed, dried, and the transition metal hydroxide precursor Tm was prepared by coprecipitation method. 0.2 Mn 0.8 (OH) 2 (TM is Ni element, 0 ≤ x <0.5, 0.5 <1);
[0067] (4) Weigh 1.757 g of dry precursor, 0.045 g of trifluidin and 1.031 g of a hydrate of hydroxide according to transition metal e...
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