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Preparation method of Co-Al active material coated nickel-cobalt-aluminum ternary layered positive electrode material

A technology of active materials and positive electrode materials, applied in the field of synthesis of positive electrode materials, can solve problems such as migration and continuous growth of negative electrode SEI film

Inactive Publication Date: 2019-08-23
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 5. NCM materials are facing problems such as the dissolution of transition metal elements and the migration of dissolved transition metals to the surface of the negative electrode during the cycle, resulting in the continuous growth of the negative electrode SEI film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A Co-Al active material coated nickel-cobalt-aluminum ternary layered cathode material, and its preparation method is as follows:

[0034] (1) Add 50 g of NCA precursor to a mixed solvent of 1 L of water and ethanol, the ratio of water to ethanol is 9:1, and stir thoroughly with ultrasound to make it well dispersed in the solvent to obtain dispersion I.

[0035] (2) Add 1.6 g CoCl 2 ·6(H 2 O) and 0.16 g AlCl 3 ·6H 2 O is added to the dispersion I obtained in the previous step together with 6 g of urea. Heat to reflux at 95 °C, stir at 1200 r / min, and react for 12 h to obtain Co-Al LDH sheet coated NCA precursor, which is recorded as LDH-PNCA.

[0036] (3) After the above reaction is completed, filter and wash 3-5 times, and dry it in an oven at 100 °C to obtain a dry material.

[0037] (4) Take 2.00 g LDH-PNCA powder and mix with 0.95 g LiOH·H 2 After the O is sufficiently ground, the tube furnace is calcined at 1250 °C under oxygen for 20 hours to obtain the final product Co-A...

Embodiment 2

[0042] A Co-Al active material coated nickel-cobalt-aluminum ternary layered cathode material, and its preparation method is as follows:

[0043] (1) Add 50 g of NCA precursor to a mixed solvent of 1 L of water and ethanol, the ratio of water to ethanol is 9:1, and stir thoroughly with ultrasound to make it well dispersed in the solvent to obtain dispersion I.

[0044] (2) Add 2.6 g CoCl 2 ·6(H 2 O) and 0.26 g AlCl 3 ·6H 2 O and 10 g of urea were added to the dispersion I obtained in the previous step. Heat to reflux at 95 °C, stir at 1500r / min, and react for 10 hours to obtain Co-Al LDH sheet coated NCA precursor, which is recorded as LDH-PNCA.

[0045] (3) After the above reaction is completed, filter and wash 3-5 times, and dry it in an oven at 100 °C to obtain a dry material.

[0046] (4) Take 2.00g LDH-PNCA powder and mix with 0.95g LiOH·H 2 After the O was sufficiently ground, the tube furnace was calcined at 1050 °C for 24 hours under oxygen to obtain the final product Co-Al ac...

Embodiment 3

[0051] A Co-Al active material coated nickel-cobalt-aluminum ternary layered cathode material, and its preparation method is as follows:

[0052] (1) Add 50 g of NCA precursor to a mixed solvent of 1 L of water and ethanol, the ratio of water to ethanol is 9:1, and stir thoroughly with ultrasound to make it well dispersed in the solvent to obtain dispersion I.

[0053] (2) Add 2.0 g CoCl 2 ·6(H 2 O) and 2.0 g AlCl 3 ·6H 2 O is added to the dispersion I obtained in the previous step together with 15 g of urea. Heat to reflux at 90 °C, stir at 1200 r / min, and react for 32 hours to obtain Co-Al LDH sheet-coated NCA precursor, denoted as LDH-PNCA.

[0054] (3) After the above reaction is completed, filter and wash 3-5 times, and dry it in an oven at 100 °C to obtain a dry material.

[0055] (4) Take 2.00g LDH-PNCA powder and mix with 0.95g LiOH·H 2 After the O was fully ground, the tube furnace was calcined at 1350 °C under oxygen for 18 hours to obtain the final product Co-Al active mate...

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Abstract

The invention discloses a preparation method of a Co-Al active material coated nickel-cobalt-aluminum ternary layered positive electrode material. The method comprises the steps: employing LDH as a coating material precursor, and coating the surface of an NCA ternary material precursor with the coating material precursor; mixing lithium salt with the NCA ternary material precursor, and performinghigh-temperature calcination to prepare the nickel-cobalt-aluminum ternary layered positive electrode material. According to the material, the outer layer of the NCA ternary material is coated with anLi-Co-AlO2 coating layer which has certain electrochemical activity, so the performance of the battery is improved under the condition that the capacity of the battery is not lost. A Co-Al lithium compound has a more stable lattice structure and has a positive effect on the cycling stability of the material. Besides, in the lattice structure of the compound, some defect vacancies can be reservedin the structure due to the mutual doping influence of the compound, so that electron conduction and ion diffusion are facilitated, and the rate capability of the battery is improved. The method is simple to operate, novel in strategy and obvious in effect.

Description

Technical field [0001] The invention designs the technical field of the synthesis of lithium ion battery cathode materials, and particularly relates to a preparation method of a Co-Al active material coated nickel-cobalt-aluminum ternary layered cathode material. [0002] technical background [0003] With the improvement of people's living standards, private cars have become more and more popular, which greatly improves the convenience of people's lives. However, due to the increase in automobiles, the large amount of automobile exhaust emissions not only cause pollution to the environment, but also increase the number of smog weather now. These problems endanger people's health. In this regard, electric vehicles are highly favored by people due to their environmental friendliness and energy saving characteristics. For electric vehicles, the power battery is naturally the core part of the car, which makes the research results of battery materials emerge endlessly. Among them, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 张慧孙伟赵海敏施利勇何文祥周翠芳郭鑫向德波李明钧
Owner TIANNENG SAFT ENERGY JOINT CO
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