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Aluminum cladding method for lithium ion positive electrode material

A positive electrode material and aluminum coating technology, which is applied in the field of aluminum coating of lithium ion positive electrode materials, can solve the problems of solvents harmful to the human body and the environment, poor coating uniformity, and high energy consumption in production, so as to reduce hazards and improve uniformity , the effect of reducing the amount of use

Inactive Publication Date: 2014-06-18
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing aluminum coating methods for positive electrode materials use highly toxic organic solvents to dissolve organic aluminum sources to coat positive electrode materials. This type of method not only has the problem of poor coating uniformity, but also the solvent is harmful to the human body and the environment; At the same time, the low solubility of the organic aluminum source makes the amount of solvent used is large, resulting in high production energy consumption and high cost.

Method used

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  • Aluminum cladding method for lithium ion positive electrode material
  • Aluminum cladding method for lithium ion positive electrode material
  • Aluminum cladding method for lithium ion positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Prepare the coating solution: use aluminum nitrate nonahydrate and ethanol to prepare a 1mol / L aluminum salt solution as the coating solution;

[0039] 2) Coating: 100 g of uncoated ternary cathode material LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 Add it into the aluminum salt solution, heat up to reflux at 2°C / min after stirring, and the molar ratio of the element Al in the solution to the transition metal element M of the positive electrode material is Al / M=0.005;

[0040] 3) Solvent removal: after refluxing for 30 minutes, filter with suction, and dry under vacuum at 100°C to obtain a semi-finished product;

[0041] 4) Roasting: Put the semi-finished product in a muffle furnace, bake it at 500°C for 5h, and cool it down to room temperature naturally to get aluminum-coated LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 Cathode material.

[0042] Scanning electron microscopy was used to observe the morphology of the precursor alumina coated, the results are as follows Figure 3-4 Shown; XRD...

Embodiment 2～5

[0045] Using the materials and dosages listed in Table 1, the aluminum-coated cathode material was prepared according to the method of Example 1.

[0046] Table 1, materials used in Examples 1 to 5 and consumption comparison table

[0047]

[0048] Electrochemical performance analysis:

[0049]The active material samples synthesized in Comparative Example 1 and Examples 1 to 5 were respectively mixed with conductive carbon and binder polyvinylidene fluoride (PVDF) in a mass ratio of 90:5:5 in N-methylpyrrolidone (NMP ) in a solvent, stirred at room temperature for 12 hours, and made into a positive electrode slurry; the positive electrode slurry was scraped onto an Al foil current collector with a thickness of 16 μm, vacuum-dried at 120°C for 12 hours, and punched into a 14.0 mm in diameter after cold pressing. Disc; the negative electrode uses a metal lithium sheet with a diameter of 15.0mm, the electrolyte uses a 1mol / L LiPF6 solution (the solvent is EC and EMC with a vo...

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Abstract

The invention discloses an aluminum cladding method for a lithium ion positive electrode material. The aluminum cladding method comprises the following steps: (1) preparing a cladding-free positive electrode material by a conventional method; (b) preparing an aluminum salt solution from an inorganic aluminum salt and a solvent, wherein the aluminum salt solution is taken as a cladding solution, the aluminum salt is selected from aluminum nitrate, aluminum chloride, aluminum sulfate and aluminum acetate and the solvent is selected from ethanol, methanol and isopropanol; (c) adding the cladding-free positive electrode material into the aluminum salt solution, agitating and heating till the solution reflows; (d) after the solution reflows for 30 minutes, filtering to remove the solvent and drying in vacuum at 70-100 DEG C to prepare a semi-finished product; and (e) putting the semi-finished product into a muffle furnace for roasting, and naturally cooling to room temperature to obtain the aluminum-cladded positive electrode material. Compared with the prior art, the aluminum cladding method for the lithium ion positive electrode material disclosed by the invention not only can prolong the cycle life and improve the heat stability of the positive electrode material under high-charging cut-off voltage, but also can reduce the cladding cost and improve the cladding consistency.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to an aluminum coating method for lithium ion positive electrode materials. Background technique [0002] After long-term and rapid development, lithium-ion batteries have made a series of great progress, and have been widely used in all aspects of daily life. However, due to a series of shortcomings such as short lifespan, poor adaptability to abuse, and high cost of current lithium-ion batteries, its application is limited to a certain extent. [0003] The ternary materials with layered structure are considered to be one of the best choices for lithium-ion battery cathode materials as the energy source of electric vehicles due to their advantages such as high discharge capacity, good safety performance, good structural stability, and low cost. However, the poor cycle performance of layered ternary materials under high voltage limits its applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/1391H01M4/62H01M10/0525Y02E60/10
Inventor 吴振豪郎野何金华许国成
Owner NINGDE AMPEREX TECH
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