High nickel quaternary cathode material precursor, high nickel quaternary cathode material, preparation method and application

Abstract

The invention provides a high nickel quaternary cathode material precursor, a high nickel quaternary cathode material, a preparation method and an application. The chemical formula of the high nickelquaternary cathode material is shown as a formula Lia(Ni1-x-y-zCoxAlyMnz)O2, x, y, z and a are mole fractions, x is larger than 0.03 and smaller than or equal to 0.15, y is larger than 0.01 and smaller than 0.05, z is larger than 0.01 and smaller than 0.05, 1-x-y is larger than 0.6 and smaller than 0.9, and a is larger than or equal to 1 and smaller than or equal to 1.1. Soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt are prepared in a form of a solution and can be uniformly distributed in the solution, and the high-nickel quaternary cathode materialprecursor is prepared from the solution with the uniformly distributed nickel salt, cobalt salt, aluminum salt and manganese salt; then, the high nickel quaternary cathode material precursor and lithium salt are mixed and sintered four times, and the high nickel quaternary cathode material is obtained. The high nickel quaternary cathode material has stable structure, high safety performance, longcycle life and good thermal stability.

Description

technical field

[0001] The invention relates to the field of electrode materials, in particular to a precursor of a high-nickel quaternary positive electrode material, a high-nickel quaternary positive electrode material, a preparation method and an application. Background technique

[0002] As a new type of green energy, lithium-ion batteries have the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution, so they are widely used in mobile phones, notebook computers, digital cameras, etc. At the same time, lithium-ion batteries are also power sources for electric vehicles and energy storage power sources for solar renewable energy. The positive electrode materials of ion batteries that we are familiar with mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate, etc. However, due to the lack of cobalt resou...

Examples

Embodiment 1

[0046] A kind of high-nickel quaternary cathode material precursor, chemical formula is Ni 0.815 co 0.15 al 0.0175 mn 0.0175 (OH) 2 , its preparation method is:

[0047] Step (a), calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn=0.815: 0.15: 0.0175: 0.0175; add them together Mix in deionized water to prepare 0.5mol / L solution A;

[0048] Step (b), adding sodium tartrate to deionized water is mixed with solution B of 0.05mol / L;

[0049] Step (c), adding sodium hydroxide to deionized water to prepare a solution C of 1mol / L;

[0050] Step (d), control the reaction temperature of the system at 40°C, add solution A, solution B and solution C into the reactor, control the stirring speed to 800 rpm, and adjust the pH of the mixed solution to 7.5, and carry out coprecipitation reaction for 3 hours Afterwards, the precipitate is filtered, washed, and dried, w...

Embodiment 2

[0052] A kind of high-nickel quaternary cathode material precursor, chemical formula is Ni 0.815 co 0.15 al 0.014 mn 0.021 (OH) 2 , its preparation method is:

[0053] Step (a), calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn=0.815:0.15:0.014:0.021; add them together Mix in deionized water to prepare 1mol / L solution A;

[0054] Step (b), adding ammonia water to deionized water to prepare 0.2mol / L solution B;

[0055] Step (c), adding sodium hydroxide to deionized water to prepare a solution C of 2mol / L;

[0056] Step (d), control the reaction temperature of the system at 40°C, add solution A, solution B and solution C to the reactor, control the stirring speed to 750 rpm, and adjust the pH of the mixed solution to 7.0, and carry out coprecipitation reaction for 3 hours Afterwards, the precipitate is filtered, washed, and dried, wherein the drying te...

Embodiment 3

[0058] A kind of high-nickel quaternary cathode material precursor, chemical formula is Ni 0.815 co 0.15 al 0.021 mn 0.014 (OH) 2 , its preparation method is:

[0059] Step (a), calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn = 0.815: 0.15: 0.021: 0.014; add them together Mix in deionized water to prepare 2mol / L solution A;

[0060] Step (b), adding sodium tartrate to deionized water is mixed with solution B of 0.05mol / L;

[0061] Step (c), adding potassium hydroxide to deionized water to prepare a solution C of 1mol / L;

[0062] Step (d), control the reaction temperature of the system at 40°C, add solution A, solution B and solution C into the reactor, control the stirring speed to 800 rpm, and adjust the pH of the mixed solution to 7.5, and carry out coprecipitation reaction for 3 hours Afterwards, the precipitate is filtered, washed, and dried, wh...

technical field

[0001] The invention relates to the field of electrode materials, in particular to a precursor of a high-nickel quaternary positive electrode material, a high-nickel quaternary positive electrode material, a preparation method and an application. Background technique

[0002] As a new type of green energy, lithium-ion batteries have the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution, so they are widely used in mobile phones, notebook computers, digital cameras, etc. At the same time, lithium-ion batteries are also power sources for electric vehicles and energy storage power sources for solar renewable energy. The positive electrode materials of ion batteries that we are familiar with mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate, etc. However, due to the lack of cobalt resou...

Examples

Embodiment 1

[0046] A kind of high-nickel quaternary cathode material precursor, chemical formula is Ni 0.815 co 0.15 al 0.0175 mn 0.0175 (OH) 2 , its preparation method is:

[0047] Step (a), calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn=0.815: 0.15: 0.0175: 0.0175; add them together Mix in deionized water to prepare 0.5mol / L solution A;

[0048] Step (b), adding sodium tartrate to deionized water is mixed with solution B of 0.05mol / L;

[0049] Step (c), adding sodium hydroxide to deionized water to prepare a solution C of 1mol / L;

[0050] Step (d), control the reaction temperature of the system at 40°C, add solution A, solution B and solution C into the reactor, control the stirring speed to 800 rpm, and adjust the pH of the mixed solution to 7.5, and carry out coprecipitation reaction for 3 hours Afterwards, the precipitate is filtered, washed, and dried, w...

Embodiment 2

[0052] A kind of high-nickel quaternary cathode material precursor, chemical formula is Ni 0.815 co 0.15 al 0.014 mn 0.021 (OH) 2 , its preparation method is:

[0053] Step (a), calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn=0.815:0.15:0.014:0.021; add them together Mix in deionized water to prepare 1mol / L solution A;

[0054] Step (b), adding ammonia water to deionized water to prepare 0.2mol / L solution B;

[0055] Step (c), adding sodium hydroxide to deionized water to prepare a solution C of 2mol / L;

[0056] Step (d), control the reaction temperature of the system at 40°C, add solution A, solution B and solution C to the reactor, control the stirring speed to 750 rpm, and adjust the pH of the mixed solution to 7.0, and carry out coprecipitation reaction for 3 hours Afterwards, the precipitate is filtered, washed, and dried, wherein the drying te...

Embodiment 3

[0058] A kind of high-nickel quaternary cathode material precursor, chemical formula is Ni 0.815 co 0.15 al 0.021 mn 0.014 (OH) 2 , its preparation method is:

[0059] Step (a), calculate and weigh soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt according to the molar ratio of each element Ni: Co: Al: Mn = 0.815: 0.15: 0.021: 0.014; add them together Mix in deionized water to prepare 2mol / L solution A;

[0060] Step (b), adding sodium tartrate to deionized water is mixed with solution B of 0.05mol / L;

[0061] Step (c), adding potassium hydroxide to deionized water to prepare a solution C of 1mol / L;

[0062] Step (d), control the reaction temperature of the system at 40°C, add solution A, solution B and solution C into the reactor, control the stirring speed to 800 rpm, and adjust the pH of the mixed solution to 7.5, and carry out coprecipitation reaction for 3 hours Afterwards, the precipitate is filtered, washed, and dried, wh...

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