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A kind of preparation method of high rate, high compaction, high voltage lithium cobalt oxide cathode material

A cathode material, lithium cobalt oxide technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of electrical performance deterioration, electrochemical side reaction between material and electrolyte, large specific surface, etc., to improve consistency , The process is simple and easy to control, and the quality is stable.

Active Publication Date: 2021-09-28
HUNAN CHANGYUAN LICO CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polycrystalline lithium cobalt oxide has good rate performance due to its small primary particles, but due to its large specific surface area, it is easy to cause electrochemical side reactions between the material and the electrolyte under high voltage, and the aggregate particles are broken during the cycle. , pulverization and detachment make the exposed fresh internal surface continue to react with the electrolyte, resulting in the formation of other phases, resulting in deterioration of electrical properties

Method used

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  • A kind of preparation method of high rate, high compaction, high voltage lithium cobalt oxide cathode material
  • A kind of preparation method of high rate, high compaction, high voltage lithium cobalt oxide cathode material
  • A kind of preparation method of high rate, high compaction, high voltage lithium cobalt oxide cathode material

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Embodiment 1

[0050] A high-magnification, high-compression, high-voltage lithium cobalt oxide positive electrode material of the present invention has a particle size D50 of 8.5 μm and a specific surface area of ​​0.30 m 2 / g, the compacted density is 3.90g / cm 3 . The material SEM figure of this embodiment is as follows figure 1 shown. Depend on figure 1 It can be seen that the material has a single-crystal morphology, and it achieves 3.90g / cm2 when making a full battery. 3 high compaction density. After testing, the material has a 0.2C discharge capacity of 194.8mAh / g at 25°C and a voltage test range of 3.0V to 4.45V. The capacity retention rate of 500 cycles under 1C charge and discharge conditions is 97.1%, and the rate of 20C / 0.2C The performance is 97.5%.

[0051] The preparation method of the high rate, high compaction, high voltage lithium cobalt oxide cathode material of this embodiment comprises the following steps:

[0052] (1) Combine tricobalt tetroxide, lithium carbonat...

Embodiment 2

[0057] A high-magnification, high-compaction, high-voltage lithium cobalt oxide positive electrode material of the present invention, the particle size D50 is 9.5 μm, and the specific surface area is 0.28m 2 / g, the compacted density is 3.85g / cm 3 . The material SEM figure of this embodiment is as follows figure 2 shown. Depend on figure 2 It can be seen that the material has a single crystal morphology, and the compacted density of the full battery is 3.85g / cm 3 . After testing, the material has a 0.2C discharge capacity of 193.5mAh / g at 25°C and a voltage test range of 3.0V to 4.45V. The capacity retention rate of 500 cycles under 1C charge and discharge conditions is 96.7%, and the rate of 20C / 0.2C The performance is 97.2%.

[0058] The preparation method of the high rate, high compaction, high voltage lithium cobalt oxide cathode material of this embodiment comprises the following steps:

[0059] (1) Cobalt carbonate, lithium hydroxide, Al 2 o 3 , MgO and Pr 2 ...

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Abstract

The invention discloses a method for preparing a high-magnification, high-pressure, and high-voltage lithium cobaltate cathode material. The particle size D50 of the cathode material is 6.0-11.0 μm, and the compaction density is 3.7-3.95 g / cm 3 , the preparation method includes: (1) mixing cobalt source, lithium source, compounds of doping elements M and M', and ingredients to obtain a primary mixture; (2) sintering the primary mixture to obtain a primary sintered lithium cobaltate, and Grinding and grading to obtain the first-calcined graded material; (3) Mixing the first-calcined graded material with the coating material and high-speed mixing to obtain the secondary mixture; (4) Sintering the secondary mixture, and performing crushing, grading, and removal Magnetization and sieving to obtain high-magnification, high-pressure, high-voltage lithium cobalt oxide cathode materials. The process is simple and easy to control, low in production cost, green and environmentally friendly, high in production efficiency, and can prepare positive electrode materials with uniform product composition, narrow particle size distribution, high crystallinity, and excellent physical and chemical properties and electrochemical properties.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a preparation method of a high-rate, high-pressure, high-voltage lithium cobaltate cathode material. Background technique [0002] Since the commercialization of lithium-ion batteries, because of their advantages such as high working voltage, high energy density, long service life, wide working temperature range, no memory effect and no pollution, they have been widely used in the fields of communication, mobile and electric tools. At present, it is the general trend to increase the charge and discharge voltage of the positive electrode material to increase the energy density of the battery. Most of the batteries of high-end electronic products have been replaced with batteries with a charge cut-off voltage of 4.4V and higher, which temporarily alleviates the user's concern about the battery capacity. However, when the battery is exhausted, it takes at lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525
CPCC01G51/70C01P2004/03C01P2004/61C01P2006/10C01P2006/12C01P2006/40H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 廖达前唐朝辉朱健曾文赛胡柳泉周友元
Owner HUNAN CHANGYUAN LICO CO LTD