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Preparation method of in situ coating modified NCA cathode material

A technology of nickel cobalt lithium aluminate and cathode material, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of reducing the specific capacity of NCA materials, increasing the process and cost, and hindering the migration of lithium ions.

Inactive Publication Date: 2017-05-24
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The commonly used coating is TiO 2 、Al 2 o 3 , MgO and other metal oxides, although the interface stability of the modified material has been improved, but these coating materials themselves are electrochemically inert materials, which not only hinder the migration of lithium ions, but also reduce the specific capacity of NCA materials; in addition The conventional coating method is to prepare the NCA positive electrode material first, and then coat it, which increases the process and cost

Method used

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  • Preparation method of in situ coating modified NCA cathode material
  • Preparation method of in situ coating modified NCA cathode material

Examples

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Embodiment 1

[0019] 26.5 g of tetrabutyl titanate was dissolved in 2 L of absolute ethanol and stirred for 10 min. Add 500g Ni to the solution 0.80 co 0.15 Al 0.05 (OH) 2 Precursor, 245g LiOH·H 2 O and 15g of citric acid were heated and stirred at 60°C to obtain a sol. The sol was dried in a blast drying oven at 110°C for 12 hours, and passed through a 300-mesh sieve after grinding. The sieved material was placed in a resistance furnace at 850°C for 12 hours. After the material was cooled to room temperature, it was taken out, crushed by airflow and passed through a 400-mesh sieve to obtain a surface-coated 1 wt.% Li 4 Ti 5 o 12 Nickel cobalt lithium aluminate cathode material.

[0020] figure 1 Surface coating 1 wt.% Li prepared for Example 1 4 Ti 5 o 12 XRD pattern of nickel cobalt lithium aluminate cathode material. Coated Li 4 Ti 5 o 12 The XRD pattern of the material does not change significantly, and the two pairs of split peaks (006) / (102) and (110) / (108) are clearly...

Embodiment 2

[0023] Dissolve 15g of titanium tetrachloride in 2L of absolute ethanol and stir for 10min. Add 500g Ni to the solution 0.80 co 0.15 Al 0.05 (OH) 2 Precursor, 245g LiOH·H 2 O and 15g of citric acid were heated and stirred at 60°C to obtain a sol. The sol was dried in a blast drying oven at 110°C for 12 hours, and passed through a 300-mesh sieve after grinding. The sieved material was placed in a resistance furnace at 850°C for 12 hours. After the material was cooled to room temperature, it was taken out, crushed by air flow and passed through a 400-mesh sieve to obtain a surface-coated 1 wt.% Li 4 Ti 5 o 12 Nickel cobalt lithium aluminate cathode material.

[0024] The surface obtained in Example 2 is coated with 1 wt.% Li 4 Ti 5 o 12 The nickel cobalt lithium aluminate cathode material was tested by XRD. Test gained XRD pattern has and figure 1 Same feature: Coated Li 4 Ti 5 o 12 The XRD pattern of the material does not change significantly, and the two pairs ...

Embodiment 3

[0027] 53 g of tetrabutyl titanate was dissolved in 2 L of absolute ethanol and stirred for 10 min. Add 500g Ni to the solution 0.80 co 0.15 Al 0.05 (OH) 2 Precursor, 248g LiOH·H 2 O and 10g of glacial acetic acid were heated and stirred at 80°C to obtain a sol. The sol was dried in a blast drying oven at 110°C for 12 hours, and passed through a 300-mesh sieve after grinding. The sieved material was placed in a resistance furnace at 880°C for 15 hours. After the material was cooled to room temperature, it was taken out, crushed by air flow and passed through a 400-mesh sieve to obtain a surface-coated 2 wt.% Li 4 Ti 5 o12 Nickel cobalt lithium aluminate cathode material.

[0028] The surface obtained in Example 3 is coated with 2 wt.% Li 4 Ti 5 o 12 The nickel cobalt lithium aluminate cathode material was tested by XRD. Test gained XRD pattern has and figure 1 Same feature: Coated Li 4 Ti 5 o 12 The XRD pattern of the material does not change significantly, and ...

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Abstract

The invention provides a preparation method of an in situ coating modified NCA cathode material. The method includes the steps of: 1. dissolving a titanium source in anhydrous ethanol to prepare a titanium coating solution; 2. adding a Ni0.80Co0.15Al0.05(OH)2 precursor, a lithium source and a complexing agent into the titanium coating solution, and performing heating stirring at 60-80DEG C to obtain a sol; 3. carrying out drying, grinding and sieving on the sol in order, placing the obtained powder mixture in a resistance furnace to perform sintering at 800-900DEG C for 10-20h, and conducting cooling to obtain a sintered material; and 4. crushing and sieving the sintered material so as to obtain a NCA cathode material coated with Li4Ti5O12 on the surface. The coated material prepared by the method provided by the invention is a lithium-containing compound, adopts Li4Ti5O12 as the coating layer, and can greatly improve the cycle performance under the premise of not significantly affecting the capacity of the NCA cathode material.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method of an in-situ coating modified nickel-cobalt lithium aluminate cathode material. Background technique [0002] Lithium-ion batteries have been widely used in devices such as small electronic products and electric vehicles, and their performance mainly depends on the cathode material. Therefore, the development of cathode materials with high energy density and stable structure has become the focus of attention. Among them, the reversible capacity of nickel-cobalt lithium aluminate cathode material (NCA cathode material) is close to 200 mAh / g, which is the material with the highest specific capacity among commercial cathode materials. [0003] However, the most fatal shortcoming of NCA cathode material is that it is extremely easy to absorb water, and it will quickly react with water and CO when exposed to the air. 2 reactio...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/485
CPCH01M4/485H01M4/525Y02E60/10
Inventor 张云河许开华叶建郭苗苗
Owner JINGMEN GEM NEW MATERIAL
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