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Lithium ion secondary battery and cathode material prepared by same

A technology for secondary batteries and positive electrode materials, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as high-temperature gas production, and achieve high energy density, good high-temperature storage performance, and large-capacity effects

Inactive Publication Date: 2010-12-01
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to address the deficiencies of the prior art, to provide a positive electrode material for a lithium-ion secondary battery, which can not only prepare a battery with a larger capacity and a higher energy density, but also solve the problem of high temperature problems in the battery. gas problem

Method used

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  • Lithium ion secondary battery and cathode material prepared by same
  • Lithium ion secondary battery and cathode material prepared by same
  • Lithium ion secondary battery and cathode material prepared by same

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Positive electrode production

[0042] Use LiCoO with an average particle diameter D50 of 18 μm 2 As the lithium cobaltate-based active material A, that is, LiCoO with a particle size of less than 18 μm 2 The particle volume accounts for 50% of the total particle volume; use Li with an average particle size D50 of 12 μm 1.02 Ni 0.78 co 0.20 al 0.02 o 2 As high-nickel active material B, that is, Li with a particle size of less than 12 μm 1.02 Ni 0.78 co 0.2 0Al 0.02 o 2 The particle volume accounts for 50% of the total particle volume. The high-nickel active material B is washed with deionized water for 15 minutes before mixing to achieve the purpose of removing lithium-containing impurities (such as lithium carbonate, lithium hydroxide, etc.), and dried in a vacuum at 100°C and a vacuum pressure of less than 100Pa after centrifugation 20 hours to remove moisture. Adjust the weight ratio B / A of the high-nickel active material B to the lithium cobaltate-based ...

Embodiment 2

[0048] Use LiCoO with an average particle diameter D50 of 18 μm 2 As the lithium cobaltate-based active material A, Li with an average particle diameter D50 of 12 μm was used. 1.02 Ni 0.78 co 0.20 al 0.02 o 2 As the high-nickel active material B, the high-nickel active material B was subjected to the same pretreatment method as in Example 1, but after centrifugation, it was dried in vacuum at a vacuum pressure of less than 100 Pa for 15 hours at 80° C. to remove moisture. Adjust the weight ratio B / A of the high-nickel active material B to the lithium cobaltate-based active material A to be 1.67. And change the compacted density of the positive electrode membrane to 3.9g / cc. Except for this, a lithium ion secondary battery was fabricated in the same manner as in Example 1.

Embodiment 3

[0050] Use LiCoO with an average particle diameter D50 of 18 μm 2 As the lithium cobaltate-based active material A, Li with an average particle diameter D50 of 12 μm was used. 1.02 Ni 0.78 co 0.20 al 0.02 o 2 As the high-nickel active material B, the high-nickel active material B was subjected to the same pretreatment as in Example 1, and the weight ratio B / A of the high-nickel active material B to the lithium cobaltate-based active material A was adjusted to 3. And change the compacted density of the positive electrode membrane to 3.8g / cc. Except for this, a lithium ion secondary battery was fabricated in the same manner as in Example 1.

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Abstract

The invention relates to the lithium ion battery field, in particular to a high-capacity cathode material and a high energy density lithium ion secondary battery prepared by the cathode material. The cathode material comprises a cathode active material, an adhesive and a conductive agent, wherein the cathode active material is a composite material of a lithium cobalt oxide active material A and a high nickel active material B; the high nickel active material B is pretreated before mixing; and the mass ratio of the high nickel active material B to the lithium cobalt oxide active material A is between 0.82 and 9. The cathode material can not only prepare the batteries with higher capacity and energy density but also solve the problem of high temperature gas production in the batteries.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to high-capacity cathode materials and high-energy-density lithium-ion secondary batteries prepared using the materials. Background technique [0002] Lithium-ion secondary batteries have become one of the most widely used secondary batteries due to their advantages of high voltage and high energy density. With the continuous development of miniaturization and long standby time of portable electronic devices, the energy density, especially the volumetric energy density, of lithium-ion batteries used as power sources has been continuously improved to meet the increasing demand. [0003] At present, the most mature positive electrode material for energy-type lithium-ion secondary batteries is lithium cobalt oxide. The positive electrode diaphragm composed of it can have a compact density of 4.1g / cc without affecting battery performance, and has excellent cycle performance. , but ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/131H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李路柳娜许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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