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Composite anode material of high-voltage lithium ion battery and lithium ion battery

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor high-temperature storage performance and low discharge capacity, and achieve high discharge capacity, high volume energy density, and excellent cycle. effect on performance and high temperature storage performance

Active Publication Date: 2013-01-23
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objectives of the present invention is to: address the deficiencies of the prior art, to provide a positive electrode material with a coating layer on the surface, so that the positive electrode material can be used at a higher charge cut-off voltage, that is, compared to the charge cut-off voltage of lithium It is 4.3V~4.6V, which not only improves the volumetric energy density of the lithium-ion battery, but also enables the coated positive electrode material to have excellent cycle life under high voltage and good high-temperature storage, thereby overcoming the high Insufficient cycle performance when used at the charge cut-off voltage, poor high-temperature storage performance, and low discharge capacity

Method used

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Embodiment 1

[0024] Embodiment 1: the positive electrode material that this embodiment provides is the Li that coating amount is 5wt% 1.01 Al 0.02 Ni 0.48 co 0.18 mn 0.32 o 2 / Li 0.98 co 0.98 Al 0.02 o 2 The composite cathode material, the BET of the composite cathode material is 0.42m 2 / g,D 50 = 10 μm. Among them, Li 1.01 Al 0.02 Ni 0.48 co 0.18 mn 0.32 o 2 / Li 0.98 co 0.98 Al 0.02 o 2 Expressed in Li 1.01 Al 0.02 Ni 0.48 co 0.18 mn 0.32 o 2 is the core layer material, Li 0.98 co 0.98 Al 0.02 o 2 It is the positive electrode material of the shell material, the same below. Its preparation method is as follows: Weigh a certain mass of lithium nitrate, cobalt nitrate, aluminum nitrate and citric acid and add them to 250 mL of ethanol, stir to dissolve them to form a lithium-cobalt-aluminum mixed solution, and adjust the pH of the solution to 6.8; add 250g Core layer material Li 1.01 Al 0.02 Ni 0.48 co 0.18 mn 0.32 o 2 (The core layer material is formed...

Embodiment 2

[0025] Embodiment 2: the positive electrode material that this embodiment provides is the Li that coating amount is 10wt% 0.98 Mg 0.08 Ni 0.46 co 0.16 mn 0.30 o 2 / Li 1.02 co 0.995 Zr 0.005 o 2 composite cathode material, the BET of the cathode material is 0.38m 2 / g,D 50 =15.0 μm. The preparation method is as follows: Weigh a certain mass of lithium acetate, cobalt acetate, zirconium acetate and ammonia water and add them to 500 mL of water, stir to dissolve them to form a lithium-cobalt-zirconium mixed solution, and adjust the pH of the solution to 8.9; add 250 g of the nuclear layer Material Li 0.98 Mg 0.08 Ni 0.46 co 0.16 mn 0.30 o 2 (The core layer material is formed by agglomeration of particles with a particle size of 1.5 μm, and the median particle size is D 50 =13 μm) powder, stirred evenly; after the above mixed solution was dried, it was first calcined at 650°C in an air atmosphere for 4 hours, and then at 1000°C in an air atmosphere for 4 hours to...

Embodiment 3

[0026] Embodiment 3: the positive electrode material that this embodiment provides is the Li that coating amount is 8wt% 1.08 Mg 0.03 Ti 0.03 Ni 0.52 co 0.17 mn 0.27 o 2 / Li 1.01 co 0.984 Al 0.01 B 0.006 o 2 composite cathode material, the BET of the cathode material is 0.21m 2 / g,D 50 =18.0 μm. The preparation method is as follows: Weigh a certain amount of lithium acetate, cobalt acetate, aluminum nitrate, boric acid and citric acid and add them to 250mL isopropanol, stir to dissolve them to form a mixed solution of lithium cobalt aluminum boron, and adjust the pH= 7; add 250g Li 1.08 Mg 0.03 Ti 0.03 Ni 0.52 co 0.17 mn 0.27 o 2 (The core layer material is formed by agglomeration of particles with a particle size of 2.5 μm, and the median particle size is D 50 = 16.5 μm) powder, and stirred evenly; after drying the above mixed solution, it was first calcined at 700°C in an air atmosphere for 5 hours, and then at 900°C in an air atmosphere for 15 hours to ...

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Abstract

The invention discloses a composite anode material of a lithium ion battery. The composite anode material has a core-shell structure, a core layer material is Li1+nAwNi0.5+xCo0.2+yMn0.3+zO2, a shell layer material is Li1+aCo1-bMbO2, and the shell layer material accounts for 0.1-20% of the composite anode material in mass percent. Compared with the prior art, the composite anode material disclosed by the invention has the advantages that because a cladding layer can exert effective gram volume and discharge voltage platform under high voltage, the energy density of the battery is improved, and in addition, the structural stability of an enhancement matrix material of the cladding layer is good for effectively inhibiting the dissolution of Mn among the materials in a cyclic process, and the oxidation of electrolyte by the anode material is reduced; and in addition, the invention further discloses a preparation method of the anode material and the lithium ion battery containing the anode material.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to lithium-ion batteries and a high-voltage lithium-ion battery composite positive electrode material using a core-shell structure. Background technique [0002] Lithium-ion batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator spaced 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 The negative electrode collector and the negative electrode material distributed on the negative electrode collector. At present, the commonly used lithium-ion cathode material is LiCoO 2 、LiNi 0.5 co 0.2 mn 0.3 o 2 , LiMn 2 o 4 、LiFePO 4 Wait. [0003] The above several cathode materials have their own defects, such as LiCoO 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485
CPCY02E60/122Y02E60/10
Inventor 庞佩佩徐磊敏柳娜王梦邓耀明赖旭伦
Owner DONGGUAN AMPEREX TECH
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