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A doped and coated modified lithium nickel cobalt aluminate cathode material and a preparation method thereof

A technology of lithium nickel cobalt aluminate and lithium nickel cobalt oxide, which is applied in the field of doping and coating modified nickel cobalt lithium aluminate cathode material and its preparation, can solve the problem of limiting the application of ternary cathode materials and the cycle stability of lithium-ion batteries To improve cycle stability and inhibit erosion

Inactive Publication Date: 2018-12-21
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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Problems solved by technology

However, lithium-ion batteries based on ternary cathode materials still have the defect of poor cycle stability, which severely limits the application of ternary cathode materials.

Method used

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  • A doped and coated modified lithium nickel cobalt aluminate cathode material and a preparation method thereof
  • A doped and coated modified lithium nickel cobalt aluminate cathode material and a preparation method thereof
  • A doped and coated modified lithium nickel cobalt aluminate cathode material and a preparation method thereof

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preparation example Construction

[0035] The present invention also provides a method for preparing a doped and coated modified nickel-cobalt-lithium-aluminate positive electrode material, comprising the following steps:

[0036] (1) providing a titanium coating solution comprising a titanium source and an organic solvent;

[0037] (2) After mixing the titanium coating liquid in the step (1) with the nickel-cobalt-lithium-aluminate precursor, evaporate the organic solvent to obtain the precursor of the mixed titanium source; the nickel-cobalt-lithium-aluminate precursor is Ni 1-x-y co y al x (OH) 2 , where, 0.030≤x≤0.050, 0.100≤y≤0.150;

[0038] (3) The precursor of the mixed titanium source obtained in the step (2) is mixed with a lithium source and a chlorine source for ball milling to obtain a ball mill mixture;

[0039] (4) Under an oxygen atmosphere, pre-sinter and re-sinter the ball-milled mixture obtained in the step (3) to obtain a primary coating doped positive electrode material; the temperature of...

Embodiment 1

[0064] Preparation of cathode material:

[0065] (1) Dissolve tetraisopropyl titanate in 200 mL of absolute ethanol at a molar ratio of titanium source and organic solvent of 1:100, heat and stir at a constant speed for 10 min to prepare a titanium coating solution.

[0066] (2) According to the proportion that tetraisopropyl titanate accounts for the mole fraction of the precursor is 0.05mol%, the NCA precursor (molecular formula Ni 0.815 co 0.15al 0.035 (OH) 2 ) into the stirred titanium coating solution. During the mixing process, the temperature of the solution was controlled at 45°C. After stirring at a constant speed for 3 hours, the temperature was raised to 95°C, kept at 95°C, and the organic solvent was evaporated to dryness to obtain titanium-coated NCA. Precursor.

[0067] (3) Mix the titanium-coated NCA precursor prepared in (2), the lithium source (lithium hydroxide monohydrate) and ammonium chloride uniformly with a ball mill at a speed of 100r / min for 10h to...

Embodiment 2

[0072] The cathode material was prepared according to the method of Example 1, except that the mole fraction of tetraisopropyl titanate in the precursor in step (2) was 0.10 mol%.

[0073] Similarly, the elemental analysis and detection of the obtained positive electrode material shows that the obtained positive electrode material is a doped and coated modified nickel-cobalt lithium aluminate positive electrode material, including a chlorine-doped nickel-cobalt lithium aluminate core body core coating layer. The composition of the chlorine-doped nickel-cobalt-aluminate (NCA) core body is LiNi 0.815 co 0.15 al 0.035 Cl 0.005 o 1.9975 , the components of the cladding layer are PAN and Li 4 Ti 5 o 12 , the molar ratio of the cladding layer to the core body is 0.0010:1, and the PAN and Li in the cladding layer 4 Ti 5 o 12 The molar ratio is 4:1.

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Abstract

The invention particularly relates to a doped coated modified lithium nickel cobalt aluminate cathode material and a preparation method thereof. A lithium nickel-cobalt aluminate cathode material doped with coating modification comprises a chlorine-doped lithium nickel-cobalt oxide core and a coating layer; The coating consists of polyaniline and Li4Ti5O_12. The chemical composition of Cl-doped lithium nickel cobalt oxide core is LiNi 1-X-YCoyAlxClzO2-0.5z, where 0.030 <= x <= 0. 050, 0.100 <= y <= 0. 150, 0.005 <= z <= 0. 0075. The invention uses doping and coating means to modify the lithiumnickel cobalt aluminate material at the same time, and starts from the inside and outside of the material, not only improves the internal crystal structure, but also improves the corrosion of the side reaction of the electrolyte, and on the premise of not significantly affecting the capacity of the lithium nickel cobalt aluminate cathode material, effectively improves the cycling stability of thematerial.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a doped and coated modified nickel-cobalt lithium aluminate positive electrode material and a preparation method thereof. Background technique [0002] As an energy system that realizes the conversion and storage of chemical energy and electrical energy, chemical power sources have developed relatively maturely, and a variety of high-performance battery products have been formed, such as widely used lead-acid batteries and nickel-cadmium batteries. Although these traditional chemical power sources have the advantages of stable quality and high reliability, they will cause serious environmental pollution in the process of battery product manufacturing, especially the damage caused by improper disposal of waste batteries to the living environment of human beings, which will seriously threaten Human life and health. In cont...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 李文魏爱佳李晓辉白薛张利辉
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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