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Preparation method of ternary cathode material

A technology of positive electrode material and crystal water, which is applied in the field of electrochemistry, can solve the problems that affect the stability of product batches and performance uniformity, and the difficulty of uniform mixing of raw materials, etc., and achieve the effects of shortening the preparation time, uniform particle size, and uniform dispersion

Active Publication Date: 2015-05-13
嘉峪关大友嘉能精碳科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Directly use high-valent manganese salts (such as Mn 3 o 4 or MnO 2 ), cobalt salts as raw materials, nickel-cobalt-manganese ternary positive electrode materials were prepared by solid phase method, although the higher oxidation state of manganese and cobalt ions was ensured, but it was not easy to uniformly mix the raw materials, which affected the batch stability of the product and performance uniformity

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Examples

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Embodiment 1

[0028] A method for preparing a battery ternary cathode material, the method comprising the following steps:

[0029] 1. Take 0.03 mol of lithium nitrate, 0.010 mol of nickel nitrate hexahydrate, 0.010 mol of manganese acetate tetrahydrate, and 0.010 mol of cobalt acetate tetrahydrate, and dissolve them in 75 mL of ethanol solution with a concentration of 99.9% by mass to obtain lithium-containing salt and manganese The homogeneous mixed solution of salt, in which the lithium ion concentration is 0.4 mol / L, at this time the color of the mixed solution is red with divalent manganese ions and cobalt ions.

[0030] 2. Fully stir the above-mentioned mixed solution, continue blowing air with a blower, add 13.5mL of concentrated ammonia water with a mass percentage concentration of 25%, and make the above-mentioned mixed solution become a dark black solution, that is, divalent manganese ions and cobalt ions are oxidized to The color after the higher valence state. The density of am...

Embodiment 2

[0036] A method for preparing a battery ternary cathode material, the method comprising the following steps:

[0037] 1. Take 0.03 mol of lithium acetate, 0.012 mol of nickel acetate, 0.012 mol of manganese acetate, and 0.006 mol of cobalt acetate, and dissolve them in 300 mL of ethanol solution with a concentration of 80% by mass to obtain a homogeneous mixed solution containing lithium salt and manganese salt , where the concentration of lithium ions is 0.1 mol / L, the color of the mixed solution is red with divalent manganese ions and cobalt ions.

[0038] 2. Fully stir the above-mentioned mixed solution, continuously blow in air with a blower, add 6.7mL of concentrated ammonia water with a mass percentage concentration of 25%, and make the above-mentioned mixed solution become a dark black solution, that is, the divalent manganese ion and the cobalt ion are oxidized to The color after the higher valence state. The density of ammonia water is calculated as 0.91g / mL, and the...

Embodiment 3

[0042] A method for preparing a battery ternary cathode material, the method comprising the following steps:

[0043]1. Get 0.3 mol lithium acetate dihydrate, 0.15 mol nickel nitrate hexahydrate, 0.09 mol manganese acetate tetrahydrate, and 0.06 mol cobalt nitrate hexahydrate and dissolve in 300 mL of methanol solution with a concentration of 95% by mass to obtain lithium-containing salt and A homogeneous mixed solution of manganese salts, in which the concentration of lithium ions is 1.0 mol / L, at this time the color of the mixed solution is red with divalent manganese ions and cobalt ions.

[0044] 2. fully stir the above-mentioned mixed solution, continue to blow air with the air blower, add the concentrated ammonia water 67mL that the mass percentage concentration concentration is 25%, make the above-mentioned mixed solution become dark black solution, promptly divalent manganese ion and cobalt ion are oxidized to relatively The color after the high valence state. The den...

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Abstract

The invention discloses a preparation method of a ternary cathode material. The method includes: dissolving a lithium salt, a nickel salt, a manganese salt and a cobalt salt in an alcohol compound solvent according to certain mole ratio, then stirring them and introducing air or oxygen continuously, adding concentrated ammonia water or ammonia, raising the temperature to 80-120DEG C, and conducting roasting in a high temperature furnace at 800-950DEG C for 6-24h, thus obtaining submicron scale particles of the ternary cathode material LiNi1 / 3Mn1 / 3Co1 / 3O2, LiNi0.4Mn0.4Co0.2O2, LiNi0.5Mn0.3Co0.2O2 and LiNi0.7Mn0.15Co0.15O2. For the preparation method, as manganese ions and cobalt ions are subjected to pre-oxidation in a precursor preparation process, the oxidation states of manganese ions and cobalt ions in the precursor are improved, low temperature oxidation at 350-450DEG C is not needed, and the product preparation time is greatly shortened. The method does not introduce hetero-metal ions in the preparation process, and the preparation process is simple and fast. The prepared product particles are uniform in size, which ranges from 200 to 300nm, and the particles are uniformly dispersed.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a submicron nickel-cobalt-manganese ternary positive electrode material. Background technique [0002] The ternary cathode material is a composite material with a ternary synergistic effect of cobalt, nickel, and manganese: Co can stabilize the layered structure and inhibit cation rearrangement; Ni helps to improve the lithium intercalation capacity of the material; Mn can greatly reduce the cost , and can effectively improve the safety performance of the material. The comprehensive performance of the material is excellent, and the assembled lithium-ion battery has the characteristics of high capacity, high working voltage and excellent thermal stability. [0003] The manganese salts and cobalt salts used to prepare ternary materials are generally +2 valences, which are lower than the valences of +4 and +3 in the product. Therefore, when prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/505H01M4/525
CPCY02E60/10
Inventor 李春雷李永立夏锋山李东仁马彦李世友
Owner 嘉峪关大友嘉能精碳科技股份有限公司
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