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Anode material, preparation method of anode material and lithium ion battery comprising anode 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: 2013-06-05
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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  • Anode material, preparation method of anode material and lithium ion battery comprising anode material
  • Anode material, preparation method of anode material and lithium ion battery comprising anode material
  • Anode material, preparation method of anode material and lithium ion battery comprising anode material

Examples

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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 400 mL of water, stir to dissolve them, and form a lithium-nickel-manganese mixed solution, and adjust the pH of the solution to 7.8; Phase material Li 1.01 co 0.99 Mg 0.01 o 2 powder, stirred evenly; adjust the pH of the solution to 11.8, stir and mix evenly; after drying the above-mentioned mixed solution, first roast it in a...

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 300 mL of 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 250g LiCo 0.998 Ti 0.002 o 2 powder, stir evenly, adjust the pH of the solution to 10.1, stir and mix evenly; after the above mixed solution is dried, it is first roasted at 550°C in an air atmosphere for 4 hours, and then at 1000°C in an air atmosphere 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 400 mL 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 200g LiCo 0.99 Ni 0.01 o 2 Powder, stir evenly, adjust the solution pH=11.2, stir and mix evenly; after drying the above-mentioned mixed solution, first bake it under 700°C air atmosphere for 5 hours, and then bake it under 800°C air atmosphere 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 particularly relates to anode material. The anode material is formed by bulk phase material and surface material in a fusion mode, wherein the surface material is located on the surface of the bulk phase material, the bulk phase material is lithium cobalt oxide, the surface material is fusing granules which are composed of layered nickel lithium manganate, and the surface material accounts for 0.1-10% of the anode material by a mass percentage. Compared with the prior art, the anode material which is formed by the layered nickel lithium manganate is coated on the surface of the lithium cobalt oxide, due to the fact that the coating layer has good lithium-ion conduction performance, not only is a discharge voltage platform of the anode material not reduced and is the discharge voltage platform of the anode material increased on the contrary, but also the coating layer can play effective gram volume under high voltage, increase structural stability of base body material and accordingly improve the discharge capacity of the anode material under the high voltage and prolong the cycle life of the anode material significantly. In addition, the invention further discloses a preparation method of the anode material and a lithium ion battery comprising the anode 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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IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCY02E60/122H01M4/0471H01M10/052Y02E60/10
Inventor 庞佩佩徐磊敏王梦杨凯柳娜
Owner DONGGUAN AMPEREX TECH
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