Modification method for lithium nickel cobalt manganese oxide ternary composite material

A technology of nickel-cobalt lithium manganese oxide and composite materials, which is applied in the field of lithium-ion battery material preparation, can solve the problems of low initial efficiency and poor rate performance, and achieve the effect of improving liquid absorption capacity and specific capacity

Inactive Publication Date: 2018-08-24
SHANDONG FENGYUAN CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a modification method of nickel-cobalt-lithium-manganese-oxide ternary composite material, which solves the defects of current ternary materials such as low initial efficiency and poor rate performance, and supplements lithium

Method used

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  • Modification method for lithium nickel cobalt manganese oxide ternary composite material
  • Modification method for lithium nickel cobalt manganese oxide ternary composite material
  • Modification method for lithium nickel cobalt manganese oxide ternary composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] a) Weigh 0.08mol (10.4g) nickel chloride, 0.01mol (2.81g) cobalt sulfate, 0.01mol (1.79g) manganese nitrate and add to 500ml deionized water to disperse evenly, add 10g sodium carbonate and 10ml ammonia water, pass Precipitation of nickel hydroxide, cobalt and manganese was obtained by co-precipitation method; after that, hydrogen chloride acid gas was introduced to adjust the pH of the solution to 6.5; after that, it was filtered and dried to obtain the precursor nickel hydroxide, cobalt and manganese ternary material A;

[0018] b) Weigh 8g of lithium metaaluminate, 2g of graphene, and 3g of polyvinylidene fluoride, add them to 100ml of N-methylpyrrolidone, stir well to obtain a mixture of lithium metaaluminate with a concentration of 10%, and then add 50g of precursor nickel cobalt hydroxide Manganese ternary material A, after stirring evenly, prepared spherical material B by spray drying; then transferred material B to a rotary furnace, and sintered at a temperature ...

Embodiment 2

[0021] a) Weigh 0.08mol (14.64g) of nickel nitrate, 0.01mol (1.3g) of cobalt chloride and 0.01mol (1.79g) of manganese nitrate into 500ml of deionized water, stir well and then add 10g of sodium bicarbonate and 10ml of ammonia , the nickel hydroxide cobalt manganese precipitate was prepared by the co-precipitation method; then the pH of the solution was adjusted to 6 by introducing hydrogen sulfide acid gas; after that, it was filtered and dried to obtain the precursor nickel cobalt manganese hydroxide ternary material A;

[0022] b) Weigh 5g of lithium metaaluminate, 1g of graphene, and 1g of polyvinylidene fluoride, add it to 100ml of N-methylpyrrolidone, stir well to obtain a mixture of lithium metaaluminate with a concentration of 7%, and then add 60g of precursor to the solution Nickel-cobalt-manganese hydroxide ternary material A, after being stirred evenly, was spray-dried to prepare spherical material B; then material B was transferred to a rotary furnace, and sintered ...

Embodiment 3

[0025] a) Weigh 0.08mol (21.04g) of nickel sulfate, 0.01mol (2.81g) of cobalt sulfate, and 0.01mol (1.51g) of manganese sulfate into 500ml of deionized aqueous solution, stir well, then add 10g of sodium bicarbonate and 10ml of Ammonia, nickel hydroxide cobalt manganese precipitation was prepared by the co-precipitation method; then carbon dioxide acid gas was introduced to adjust the pH of the solution to 7; after that, it was suction filtered and dried to obtain the precursor nickel cobalt manganese hydroxide ternary material A;

[0026] b) Weigh 10g of lithium metaaluminate, 5g of graphene, and 5g of polyvinylidene fluoride, add it to 75ml of N-methylpyrrolidone, stir well to obtain a mixture of lithium metaaluminate with a concentration of 20%, and then add 45g of precursor to the solution Nickel-cobalt-manganese hydroxide ternary material A was stirred evenly and then spray-dried to prepare spherical material B; after that, material B was transferred to a rotary furnace an...

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Abstract

The invention belongs to the field of lithium-ion battery material preparation and particularly discloses a modification method for a lithium nickel cobalt manganese oxide ternary composite material.The method comprises the steps of firstly preparing nickel hydroxide cobalt-manganese sediments through a coprecipitation method, introducing acid gases to adjust pH of a solution to be 6.0-7.0 and then carrying out suction filtration and drying to obtain a precursor nickel hydroxide cobalt-manganese ternary material; sequentially carrying out lithium metaaluminate coating, sintering, crushing andgrading; and finally injecting inert lithium powder into the surface of the material through a particle injection method to obtain a lithium-rich ternary composite material. The acid gases, such as carbon dioxide are combined with residual sodium hydroxide and ammonium hydroxide separately to form sodium bicarbonate and ammonium bicarbonate, and nano-holes are left after sintering, so that the liquid absorption capacity of the material is improved; and meanwhile, lithium supplement is carried out on the material by adopting the lithium powder injected into the surface of the material and enough lithium ions are provided for the charging and discharging processes, so that the specific capacity and the rate capability of the ternary composite material are improved.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery materials, in particular to a modification method of a nickel-cobalt-lithium manganese oxide ternary composite material. Background technique [0002] With the improvement of the mileage, fast charging technology and safety performance of electric vehicles in the market, lithium-ion batteries equipped with electric vehicles are required to have higher energy density, large rate performance, high safety performance and long life. service life. The ternary cathode material has become the main cathode material on the market due to its high energy density and long cycle life. The current preparation method of the ternary cathode material is mainly by mixing nickel, cobalt, and manganese salts, and adding lithium salts for sintering. It is prepared, and it has defects such as lattice structure changes, especially high-nickel ternary positive electrode materials. Due to the change of t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李桂臣朱涛
Owner SHANDONG FENGYUAN CHEM CO LTD
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