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Preparation method of cathode material of LCO (lithium cobaltate)-based lithium ion battery

A technology for ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of battery safety hazards, fast charge and discharge rate of lithium cobalt oxide, etc., and achieve volumetric energy density, space utilization, and The effect of compaction density

Active Publication Date: 2012-11-14
PULEAD TAIAN TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium cobalt oxide prepared by this method will bring a greater safety hazard to the battery due to the large content of lithium cobalt oxide in small particles and the fast charge and discharge rate of small particle lithium cobalt oxide.

Method used

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  • Preparation method of cathode material of LCO (lithium cobaltate)-based lithium ion battery
  • Preparation method of cathode material of LCO (lithium cobaltate)-based lithium ion battery
  • Preparation method of cathode material of LCO (lithium cobaltate)-based lithium ion battery

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Effect test

Embodiment 1

[0026] According to the ratio of lithium, cobalt, and titanium atoms being 1.05:1.00:0.01, cobalt carbonate, lithium carbonate, and titanium dioxide were ball milled and mixed for 5 hours; the mixed raw materials were placed in a roasting furnace, and roasted at 1000° C. for 12 hours in an air atmosphere; The calcined product is coarsely crushed, and then finely crushed using a jet mill. The average particle size D50 of the powder is 15 μm.

[0027] According to the ratio of lithium, cobalt, and titanium atoms being 1.01:1.00:0.01, cobalt carbonate, lithium carbonate, and titanium dioxide were ball milled and mixed for 5 hours; the mixed raw materials were placed in a roasting furnace, and roasted at 1000° C. in an air atmosphere for 12 hours; The calcined product is coarsely crushed, and then finely crushed using a jet mill. The average particle size D50 of the powder is 5 μm.

[0028]Weigh the powder with D50 of 15 μm and D50 of 5 μm according to the weight ratio of 1:1, add...

Embodiment 2

[0034] According to the ratio of lithium, cobalt and zirconium being 1.05:1.00:0.01, lithium carbonate, cobalt tetroxide and zirconium dioxide were ball milled and mixed for 5 hours; the mixed raw materials were placed in a roasting furnace, and roasted at 1000° C. in an air atmosphere for 12 hours; The calcined product is coarsely crushed, and then finely crushed using a jet mill. The average particle size D50 of the powder is 15 μm.

[0035] According to the ratio of lithium, cobalt and zirconium being 1.01:1.00:0.01, lithium carbonate, cobalt tetroxide and zirconium dioxide were ball milled and mixed for 5 hours; the mixed raw materials were placed in a roasting furnace, and roasted at 1000° C. in an air atmosphere for 12 hours; The calcined product is coarsely crushed, and then finely crushed using a jet mill. The average particle size D50 of the powder is 5 μm.

[0036] The powders with D50 of 15 μm and D50 of 5 μm are weighed according to the weight ratio of 1:1, and the...

Embodiment 3

[0039] Lithium carbonate, cobalt tetroxide and alumina were ball milled and mixed for 5 hours according to the ratio of lithium, cobalt and aluminum at a ratio of 1.05:1.00:0.01; the mixed raw materials were placed in a roasting furnace, and roasted at 1000° C. in an air atmosphere for 12 hours; The calcined product is coarsely crushed, and then finely crushed using a jet mill. The average particle size D50 of the powder is 15 μm.

[0040] Lithium carbonate, cobalt tetroxide and alumina are ball milled and mixed for 5 hours according to the ratio of lithium, cobalt and aluminum in a ratio of 1.01:1.00:0.01; the mixed raw materials are placed in a roasting furnace, and roasted at 1000° C. in an air atmosphere for 12 hours; The calcined product is coarsely crushed, and then finely crushed using a jet mill. The average particle size D50 of the powder is 5 μm.

[0041] The powders with D50 of 15 μm and D50 of 5 μm are weighed according to the weight ratio of 2:1, and then micron-s...

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Abstract

The invention discloses a preparation method of cathode material of an LCO (lithium cobaltate)-based lithium ion battery, which includes the following steps of: respectively preparing LCO material A with a median particle diameter of 10-25micrometers and LCO material B with a median particle diameter of 1-10micrometers which contain doping element of M; mixing the material A with the material B according to a certain proportion, adding secondary surface doping element M', carrying out ball milling and mixing, roasting and grinding to obtain material C with median particle diameter of 7-15micrometers; and finally coating an element G on the surface of the material C, drying and then conducting heat treatment to obtain the cathode material of the LCO-based lithium ion battery. Through the grading of the LCO materials with different particle diameters, the space utilization rate and the compacted density of the material are effectively improved; through the treatment of secondary surface doping, the stability of the surface structure of the material is improved; and through the coating treatment, the contact area between the LCO and the electrolyte is reduced, and the dissolution of the Co contained in the material in the electrolyte is reduced. Therefore, the cycle performance and the safety performance of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the preparation of lithium ion battery cathode materials, in particular to a preparation method of high energy density lithium ion battery cathode material lithium cobaltate. Background technique [0002] Lithium-ion battery, as a new type of secondary battery, has the characteristics of high specific capacity, high voltage, and good safety. It is widely used in the driving power of portable electrical appliances such as mobile phones, notebook computers, camcorders, DVD, and MP3. With the continuous upgrading of electronic products, the requirements for its power supply are also increasing. [0003] Under the premise of the same capacity, the market needs to continuously increase the volume energy density of the battery, that is, to increase the filling amount per unit volume of the battery active material. For the currently commonly used lithium cobalt oxide material, the larger the particle size, the wider the particle size...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 高行龙刘磊魏伟杨新河周恒辉
Owner PULEAD TAIAN TECH IND
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