Lithium ion battery gradient structure positive electrode material and preparation method and application thereof
A lithium-ion battery and gradient structure technology, applied in the field of electrochemistry, can solve problems such as low energy density and poor electrode stability, and achieve the effects of increasing energy density, stabilizing the interface, and improving stability
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Embodiment 1
[0061] This embodiment provides a method for preparing a positive electrode material with a gradient structure for a lithium-ion battery, the preparation method comprising the following steps:
[0062] (1) A manganese carbonate solution with a manganese ion concentration of 2 mol / L, a titanium sulfate solution with a titanium ion concentration of 2 mol / L, a sodium hydroxide solution with a hydroxide ion concentration of 8 mol / L, and an ammonia solution with a concentration of 5 mol / L Under stirring conditions, the temperature of the co-current mixing is 60° C., and the time of the co-current mixing is 15 hours; the flow rate of the sodium hydroxide and the ammonia solution is controlled so that the pH of the mixed solution is 11.5, and the precursor slurry is obtained; The total flow of manganese carbonate solution and titanium sulfate solution is constant, and the initial flow of manganese carbonate solution is 8mL / min, and the initial flow of titanium sulfate solution is 8mL / ...
Embodiment 2
[0068] This embodiment provides a method for preparing a positive electrode material with a gradient structure for a lithium-ion battery, the preparation method comprising the following steps:
[0069] (1) Manganese acetate solution with manganese ion concentration of 1mol / L, zirconium sulfate solution with zirconium ion concentration of 1mol / L, potassium hydroxide solution with hydroxide ion concentration of 6mol / L and ammonia solution with concentration of 4mol / L Under stirring conditions, the temperature of the co-current mixing is 65 ° C, and the time of the co-current mixing is 10 h; the flow rate of the potassium hydroxide solution and the ammonia solution is controlled so that the pH of the mixed solution is 12, and the precursor slurry is obtained; The total flow of the manganese acetate solution and the zirconium sulfate solution is constant, the initial flow of the manganese acetate solution is 9mL / min, and the initial flow of the zirconium sulfate solution is 9mL / min...
Embodiment 3
[0074] This embodiment provides a method for preparing a positive electrode material with a gradient structure for a lithium-ion battery, the preparation method comprising the following steps:
[0075] (1) Manganese sulfate solution with manganese ion concentration of 3mol / L, zirconium nitrate solution with zirconium ion concentration of 3mol / L, potassium hydroxide solution with hydroxide ion concentration of 9mol / L and ammonia solution with concentration of 6mol / L Under stirring conditions, the temperature of the co-current mixing is 55°C, and the time of the co-current mixing is 20h; the flow rate of the potassium hydroxide solution and the ammonia solution is controlled so that the pH of the mixed solution is 11, and the precursor slurry is obtained; The total flow of the manganese sulfate solution and the zirconium nitrate solution is constant, the initial flow of the manganese sulfate solution is 6mL / min, and the initial flow of the zirconium nitrate solution is 6mL / min. D...
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