Lithium ion battery composite positive electrode material and preparation method thereof

Abstract

The invention discloses a lithium ion battery composite positive electrode material. The surface of the composite positive electrode material is coated with cerium and zirconium doped mesoporous aluminum phosphate and a graphene layer. The invention also discloses a preparation method of the material. The preparation method comprises the following steps of: adding 52-54% by mass of phosphoric acidinto an aluminum isopropoxide ethanol solution, adding a solution with zirconium and cerium concentrations of 0.1 mol / L and a surfactant, uniformly mixing, and regulating the PH value to 8.0-8.5 by using an alkaline complexing agent to prepare sol, and carrying out a hydrothermal reaction on the sol to obtain a precipitate, drying the precipitate, and carrying out heat preservation at 450-650 DEGC for 5-7 h to obtain the cerium and zirconium doped mesoporous aluminum phosphate powder. The lithium ion battery positive electrode material, the cerium and zirconium doped mesoporous aluminum phosphate powder, graphene, polyethylene glycol and N-methyl pyrrolidone according to a mass ratio of (40-100): (0.5-10): (0.1-10): (0.1-10): (50-200) are mixed uniformly, and the temperature of 450-550 DEG C in nitrogen for 3-5 hours is kept. The surface of the lithium ion battery composite material is coated with cerium and zirconium doped mesoporous aluminum phosphate, and the lithium ion battery composite material has good conductivity, stability and cycle performance.

Description

technical field

[0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery composite cathode material and a preparation method thereof. Background technique

[0002] Since Sony Corporation of Japan first successfully developed and commercialized lithium-ion batteries in 1991, lithium-ion batteries have attracted more and more attention. Lithium-ion batteries are widely used in the fields of consumer electronics, electric vehicles and energy storage devices because of their outstanding advantages such as high energy density, environmental friendliness, no memory effect, long cycle life, and small self-discharge. High specific capacity and energy density, good cycle stability and high safety. At present, the anode materials of lithium-ion batteries that have been applied in the market mainly include lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, and ternary cathode materials. Although lithium cobalt oxid...

Examples

Embodiment 1

[0023] Step 1: Mix 20g of aluminum isopropoxide with 180g of absolute ethanol, heat and stir ultrasonically, the temperature is 60-80°C, and the stirring rate is 600r / min, until the aluminum isopropoxide is completely dissolved, and a uniform aluminum isopropoxide ethanol solution is obtained ;

[0024] Step 2: prepare zirconium nitrate and cerium nitrate mixed solution, the concentration of zirconium and cerium is 0.1mol / L;

[0025] Add the phosphoric acid aqueous solution with a mass percentage of 52% dropwise into the above-mentioned aluminum isopropoxide ethanol solution under stirring, and simultaneously add the above-mentioned mixed solution of zirconium nitrate and cerium nitrate, and stir while adding dropwise until a homogeneous colloid is formed; Add 0.05mol / L cetyltrimethylammonium bromide solution and stir well. Wherein, the molar ratio of aluminum isopropoxide, cerium, zirconium, phosphoric acid, and cetyltrimethylammonium bromide is 1:0.5:0.5:1:0.1.

[0026] Th...

Embodiment 2

[0038] Step 1: Mix 40g of aluminum isopropoxide with 200g of absolute ethanol, heat and stir ultrasonically, the temperature is 60-80°C, and the stirring rate is 600r / min, until the aluminum isopropoxide is completely dissolved, and a uniform aluminum isopropoxide ethanol solution is obtained ;

[0039] Step 2: prepare zirconium acetate and cerium acetate mixed solution, the concentrations of zirconium and cerium are both 0.1mol / L;

[0040] A phosphoric acid aqueous solution with a mass percent content of 54% was added dropwise to the above-mentioned aluminum isopropoxide ethanol solution under stirring, and at the same time, the mixed solution of zirconium acetate and cerium acetate prepared above was added, and stirred while adding dropwise until a homogeneous colloid was formed; Add 0.05mol / L nonylphenol ethoxylate-10 solution and stir evenly. Among them, the molar ratio of aluminum isopropoxide, cerium, zirconium, phosphoric acid, and nonylphenol ethoxylate-10 is 2:1:1:2:...

Embodiment 3

[0052] Step 1: Mix 20g of aluminum isopropoxide with 200g of absolute ethanol, heat and stir ultrasonically, the temperature is 60-80°C, and the stirring rate is 600r / min, until the aluminum isopropoxide is completely dissolved, and a uniform aluminum isopropoxide ethanol solution is obtained ;

[0053] Step 2: prepare zirconium sulfate and cerium sulfate mixed solution, the concentration of zirconium and cerium is 0.1mol / L;

[0054] A phosphoric acid aqueous solution with a mass percentage of 53% was added dropwise to the above-mentioned aluminum isopropoxide ethanol solution under stirring, and at the same time, the mixed solution of zirconium sulfate and cerium sulfate prepared above was added, and stirred while adding dropwise until a homogeneous colloid was formed; Add 0.05mol / L sodium dodecylbenzenesulfonate solution and stir well. Among them, the molar ratio of aluminum isopropoxide, cerium, zirconium, phosphoric acid, and sodium dodecylbenzenesulfonate is 1:1:1:1:0.1....

technical field

[0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery composite cathode material and a preparation method thereof. Background technique

[0002] Since Sony Corporation of Japan first successfully developed and commercialized lithium-ion batteries in 1991, lithium-ion batteries have attracted more and more attention. Lithium-ion batteries are widely used in the fields of consumer electronics, electric vehicles and energy storage devices because of their outstanding advantages such as high energy density, environmental friendliness, no memory effect, long cycle life, and small self-discharge. High specific capacity and energy density, good cycle stability and high safety. At present, the anode materials of lithium-ion batteries that have been applied in the market mainly include lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, and ternary cathode materials. Although lithium cobalt oxid...

Examples

Embodiment 1

[0023] Step 1: Mix 20g of aluminum isopropoxide with 180g of absolute ethanol, heat and stir ultrasonically, the temperature is 60-80°C, and the stirring rate is 600r / min, until the aluminum isopropoxide is completely dissolved, and a uniform aluminum isopropoxide ethanol solution is obtained ;

[0024] Step 2: prepare zirconium nitrate and cerium nitrate mixed solution, the concentration of zirconium and cerium is 0.1mol / L;

[0025] Add the phosphoric acid aqueous solution with a mass percentage of 52% dropwise into the above-mentioned aluminum isopropoxide ethanol solution under stirring, and simultaneously add the above-mentioned mixed solution of zirconium nitrate and cerium nitrate, and stir while adding dropwise until a homogeneous colloid is formed; Add 0.05mol / L cetyltrimethylammonium bromide solution and stir well. Wherein, the molar ratio of aluminum isopropoxide, cerium, zirconium, phosphoric acid, and cetyltrimethylammonium bromide is 1:0.5:0.5:1:0.1.

[0026] Th...

Embodiment 2

[0038] Step 1: Mix 40g of aluminum isopropoxide with 200g of absolute ethanol, heat and stir ultrasonically, the temperature is 60-80°C, and the stirring rate is 600r / min, until the aluminum isopropoxide is completely dissolved, and a uniform aluminum isopropoxide ethanol solution is obtained ;

[0039] Step 2: prepare zirconium acetate and cerium acetate mixed solution, the concentrations of zirconium and cerium are both 0.1mol / L;

[0040] A phosphoric acid aqueous solution with a mass percent content of 54% was added dropwise to the above-mentioned aluminum isopropoxide ethanol solution under stirring, and at the same time, the mixed solution of zirconium acetate and cerium acetate prepared above was added, and stirred while adding dropwise until a homogeneous colloid was formed; Add 0.05mol / L nonylphenol ethoxylate-10 solution and stir evenly. Among them, the molar ratio of aluminum isopropoxide, cerium, zirconium, phosphoric acid, and nonylphenol ethoxylate-10 is 2:1:1:2:...

Embodiment 3

[0052] Step 1: Mix 20g of aluminum isopropoxide with 200g of absolute ethanol, heat and stir ultrasonically, the temperature is 60-80°C, and the stirring rate is 600r / min, until the aluminum isopropoxide is completely dissolved, and a uniform aluminum isopropoxide ethanol solution is obtained ;

[0053] Step 2: prepare zirconium sulfate and cerium sulfate mixed solution, the concentration of zirconium and cerium is 0.1mol / L;

[0054] A phosphoric acid aqueous solution with a mass percentage of 53% was added dropwise to the above-mentioned aluminum isopropoxide ethanol solution under stirring, and at the same time, the mixed solution of zirconium sulfate and cerium sulfate prepared above was added, and stirred while adding dropwise until a homogeneous colloid was formed; Add 0.05mol / L sodium dodecylbenzenesulfonate solution and stir well. Among them, the molar ratio of aluminum isopropoxide, cerium, zirconium, phosphoric acid, and sodium dodecylbenzenesulfonate is 1:1:1:1:0.1....

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