Ternary precursor with controllable crystal structure, positive electrode material and preparation method of positive electrode material

A positive electrode material and crystal structure technology, applied in the field of lithium-ion battery materials, can solve the problems of reduced capacity, reduced material gram capacity, and destroyed layered structure, so as to improve the rate and cycle performance, reduce the degree of cation mixing, and reduce diffusion effect of distance

CN108269995AActive Publication Date: 2018-07-10GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-07-10

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Abstract

The invention discloses a ternary precursor with a controllable crystal structure, a positive electrode material and a preparation method of the positive electrode material. Specifically, a nickel-cobalt-manganese soluble salt, NaOH, concentrated ammonia water and a surfactant for oriented growth are separately formulated into solutions and then subjected to a coprecipitation reaction to obtain aternary precursor of an oriented grow structure; the precursor is mixed with a lithium source and then calcined at high temperature to obtain a ternary layered positive electrode material of an oriented grow precursor-like structure. The positive electrode material the crystal structure of which grows in a [003] direction is obtained by regulating the growth of the precursor, so that the order degree of internal structure growth is increased, the stability of internal structure growth is improved, cation mixing and Li+ diffusion resistance are reduced, and the Li+ diffusion coefficient is increased. The ternary precursor with the crystal structure controllable, the positive electrode material and the preparation method of the positive electrode material are applicable to lithium-ion powerbatteries. Compared with existing products, the ternary precursor and the positive electrode material have the advantages that the rate performance and cycle stability of lithium-ion batteries are significantly improved.
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Description

technical field

[0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a ternary precursor with an adjustable crystal structure, a positive electrode material and a preparation method thereof. Background technique

[0002] With the increasing demand for energy worldwide and the continuous attention to environmental issues, ternary layered cathode materials have the advantages of high energy density, wide operating temperature and operating voltage range, no memory effect, and long cycle life. It has been widely used in digital products and electric tools, and is considered to be an ideal power source for the next generation of electric vehicles.

[0003] NCM materials have a high specific capacity, and the energy density of a single cell is greatly improved compared with LFP and LMO batteries. In recent years, the research and industrialization of NCM power batteries have made great progress in Japan and South Korea. The ind...

Examples

Embodiment 1

[0059] Such as figure 1 The ternary precursor Ni with adjustable crystal structure of the present invention is shown 0.8 co 0.1 mn 0.1 (OH) 2 SEM ( figure 1 Left picture), the growth direction of the precursor crystal is emitted from the center of the circle; as figure 1 The cathode material LiNi whose crystal structure can be adjusted according to the present invention 0.8 co 0.1 mn 0.1 o 2 SEM ( figure 1 Right picture), the crystal growth direction of the cathode material is emitted from the center of the circle.

[0060] A method for preparing the above-mentioned ternary precursor and positive electrode material with adjustable crystal structure, comprising the following steps:

[0061] A. Precursor Synthesis

[0062] a) Incorporate battery-grade NiSO 4 、CoSO 4 , MnSO 4 Prepare a 1.0 mol / L solution according to the molar ratio of 8:1:1;

[0063] b) Prepare NaOH and concentrated ammonia water into solutions with concentrations of 2.0mol / L and 2.0mol / L respecti...

Embodiment 2

[0074] Such as figure 2 The cathode material LiNi whose crystal structure can be adjusted according to the present invention 0.6 co 0.2 mn 0.2 o 2 The TEM image shows that the cathode material crystals grow along the [003] direction, that is, the [003] direction is perpendicular to the spherical surface;

[0075] A method for preparing the above-mentioned ternary precursor and positive electrode material with adjustable crystal structure, comprising the following steps:

[0076] A. Precursor Synthesis

[0077] a) Incorporate battery-grade NiSO 4 、CoSO 4 , MnSO 4 Prepare a solution of 3 mol / L according to the molar ratio of 6:2:2;

[0078] b) Prepare NaOH and concentrated ammonia water into solutions with concentrations of 6 mol / L and 6.0 mol / L respectively;

[0079] c) CTMAB is configured into a solution with a concentration of 1.0 mol / L;

[0080] d) Pass the inert gas Ar2 or N2 into the reaction kettle with the bottom liquid and add the above-mentioned salt, alkali...

Embodiment 3

[0088] A Precursor Ni with Tunable Crystal Structure 1 / 3 co 1 / 3 mn 1 / 3 (OH)2 and LiNi cathode material with tunable crystal structure 1 / 3 co 1 / 3 mn 1 / 3 o 2 The preparation method comprises the following steps:

[0089] A. Precursor Synthesis

[0090] a) Incorporate battery-grade NiSO 4 、CoSO 4 , MnSO 4 Prepare a 2.0 mol / L solution according to the molar ratio of 1:1:1;

[0091] b) Prepare NaOH and concentrated ammonia water into solutions with concentrations of 4.0 mol / L and 4.0 mol / L respectively;

[0092] c) Triethanolamine is configured into a solution with a concentration of 0.8 mol / L;

[0093] d) Pass inert gas Ar2 or N2 into the reaction kettle with bottom liquid and add the above-mentioned salt, alkali, ammonia and surfactant solution dropwise at a constant speed, speed = 1200 rpm, temperature = 50 ° C, pH1 = 10.8, reaction t1 = 3 hours;

[0094] e) Increase the pH value to pH2=12.0, and continue the reaction for t2=42 h;

[0095] f) After the reaction is ...