Positive electrode material, preparation method thereof, and lithium ion battery comprising the positive electrode material

A technology for lithium ion batteries and positive electrode materials, applied in the field of positive electrode materials and their preparation, can solve the problems of unstable use structure, poor cycle performance, low discharge capacity, etc., and achieve enhanced structural stability, excellent lithium ion conductivity, The effect of high volumetric energy density

Active Publication Date: 2016-08-03
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereby overcoming the disadvantages of poor cycle performance and low discharge capacity of the positive electrode materials in the prior art when they are used under high charge cut-off voltage and are structurally unstable, or even if the structure is stable

Method used

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  • Positive electrode material, preparation method thereof, and lithium ion battery comprising the positive electrode material
  • Positive electrode material, preparation method thereof, and lithium ion battery comprising the positive electrode material
  • Positive electrode material, preparation method thereof, and lithium ion battery comprising the positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: The positive electrode material provided in this example is Li with a coating amount of 3wt%. 1.01 co 0.99 Mg 0.01 o 2 / LiNi 0.5 mn 0.5 o 2 The positive electrode material, the BET of the positive electrode material is 0.35m 2 / g,D 50 =9.0 μm. Among them, Li 1.01 co 0.99 Mg 0.01 o 2 / LiNi 0.5 mn 0.5 o 2 Expressed in Li 1.01 co 0.99 Mg 0.01 o 2 As the bulk material, LiNi 0.5 mn 0.5 o 2 It is the positive electrode material of the surface layer material, the same below.

[0036] The preparation method is as follows: Weigh a certain mass of lithium acetate, manganese acetate, nickel acetate and citric acid into 400mL of water, stir to dissolve them to form a lithium-nickel-manganese mixed solution, and adjust the pH of the solution to 7.8; add 250g of bulk phase Material Li 1.01 co 0.99 Mg 0.01 o 2 powder, stir evenly; adjust the pH of the solution to 11.8, stir and mix evenly; after drying the above mixed solution, first roast it in an...

Embodiment 2

[0037] Example 2: The positive electrode material provided in this example is LiCo with a coating amount of 1wt%. 0.998 Ti 0.002 o 2 / Li 1.02 Ni 0.5 mn 0.498 Al 0.002 o 2 The positive electrode material, the BET of the positive electrode material is 0.27m 2 / g,D 50 =15.0 μm.

[0038] The preparation method is as follows: Weigh a certain mass of lithium nitrate, manganese nitrate, nickel nitrate, aluminum nitrate and ammonia water and add them to 300mL water, stir to dissolve them to form a mixed solution of lithium nickel manganese aluminum, and adjust the pH of the solution to 6.2; add 250gLiCo 0.998 Ti 0.002 o 2 Powder, stir evenly, adjust the pH of the solution to 10.1, stir and mix evenly; after drying the above mixed solution, first bake it under an air atmosphere at 550°C for 4 hours, and then bake it under an air atmosphere at 1000°C for 4 hours to obtain the Cathode material.

Embodiment 3

[0039] Example 3: The positive electrode material provided in this example is LiCo with a coating amount of 8wt%. 0.99 Ni 0.01 o 2 / LiNi 0.5 mn 0.45 Zr 0.05 o 2 The positive electrode material, the BET of the positive electrode material is 0.22m 2 / g,D 50 =18.0 μm.

[0040] The preparation method is as follows: Weigh a certain mass of lithium hydroxide, manganese nitrate, nickel acetate, zirconium nitrate and tartaric acid and add them to 400mL of water, stir to dissolve them to form a lithium nickel manganese zirconium mixed solution, and adjust the pH of the solution to 6.7; Add 200gLiCo 0.99 Ni 0.01 o 2 Powder, stir evenly, adjust the pH of the solution to 11.2, stir and mix evenly; after drying the above mixed solution, first roast it in an air atmosphere at 700°C for 5 hours, and then roast it in an air atmosphere at 800°C for 15 hours to obtain the Cathode material.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material. The positive electrode material is formed by melting a bulk phase material and a surface layer material located on the surface of the bulk phase material. The bulk phase material is lithium cobaltate, and the surface layer material is layered nickel manganese Lithium oxide is composed of molten small particles, and the surface layer material accounts for 0.1-10% by mass of the positive electrode material. Compared with the prior art, the positive electrode material formed by coating the layered lithium nickel manganese oxide on the surface of the lithium cobalt oxide in the present invention has excellent lithium ion conductivity, not only does not reduce the discharge voltage platform of the positive electrode material, but instead To a certain extent, the discharge voltage platform of the positive electrode material can be improved; and the coating layer can also exert an effective gram capacity under high voltage, and enhance the structural stability of the matrix material, thereby significantly improving the discharge of the positive electrode material under high voltage. capacity and cycle life. In addition, the invention also discloses a preparation method of the cathode material and a lithium ion battery containing the cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material, a preparation method thereof and a lithium ion battery containing the positive electrode material. Background technique [0002] Lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet, a separator between the positive and negative electrode sheets, and an electrolyte, wherein the positive electrode sheet includes a positive electrode collector and a positive electrode material distributed on the positive electrode collector, and the negative electrode sheet includes a negative electrode. The current collector and the negative electrode material distributed on the negative electrode current collector. At present, the commonly used lithium-ion cathode material is LiCoO 2 and LiNiCoMnO 2 Wait. [0003] At present, batteries used in consumer electronics such as mobile phones and tablet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/0471H01M10/052Y02E60/10
Inventor 庞佩佩徐磊敏王梦杨凯柳娜
Owner DONGGUAN AMPEREX TECH
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