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Lithium battery compound electrode active material and preparation method thereof

A technology of electrode active materials and active materials, which is applied in the field of lithium battery composite electrode active materials and its preparation, can solve the problems of affecting the original characteristics of core materials and not easy to obtain active materials, so as to improve the conductivity and discharge power, The preparation method is simple and the effect of prolonging the cycle life

Inactive Publication Date: 2011-06-08
ショウゲン科技股ふん
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Due to the active material with charge and discharge characteristics such as LiCoO 2 When it is synthesized, high temperature and long-term calcination are required to produce a good crystal phase. It is not easy to obtain the coating layer of active materials by coating the precursor and then calcine, such as LiCoO 2 The cladding layer, because in a long-term and high-temperature environment, these cladding materials may have diffused into the interior of the clad material, which will affect the original characteristics of the core material

Method used

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  • Lithium battery compound electrode active material and preparation method thereof
  • Lithium battery compound electrode active material and preparation method thereof
  • Lithium battery compound electrode active material and preparation method thereof

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preparation example Construction

[0033] Such as figure 2 As shown, the preparation method of the lithium battery composite electrode active material provided by the present invention includes: preparing a lithium-containing fine electrode active material particle 1 as a coating layer, and another lithium-containing fine electrode active material particle 1 as the main electrode active material. Larger particle size 2 (step S1);

[0034] Next, add the above two kinds of particles into a viscous agent to form a slurry (step S2);

[0035] Again, the slurry formed in step S2 is spray-dried to form a mixed powder (step S3);

[0036] Finally, it is calcined for a short time to make it sintered (step S4).

Embodiment 1

[0037] Embodiment 1: in LiNi 0.75 co 0.2 Mg 0.05 o 2 Surface coated LiCoO 2

[0038] First provide LiCoO with a particle size of 50-100nm 2 As the coated electrode active material 2, and LiNi with a particle size of 1-10 μm 0.75 co 0.2 Mg 0.05 o 2 As the main electrode active material 1. The weight ratio of the coated electrode active material 2 to the main electrode active material 1 is maintained between 1:1 and 1:10, and a viscous agent is added, and the viscous agent is preferably carboxymethyl cellulose (Carboxymethyl Cellulose , CMC), stir it evenly to form a slurry, and then use a spray dryer to dry the slurry into a mixed powder with a particle size of 5-20 μm, and then put the powder into a high-temperature furnace at a temperature of 500 ~ Calcining at 1000°C for 0.5-5 hours and then cooling naturally.

Embodiment 2

[0039] Embodiment 2: in LiMn 2 o 4 Surface coated LiCoO 2

[0040] First provide LiCoO with a particle size of 50-100nm 2As the coated electrode active material 2, and LiMn with a particle size of 1-10 μm 2 o 4 As the main electrode active material 1. The weight ratio of the coated electrode active material 2 to the main electrode active material 1 is maintained between 1:1 and 1:10, and a viscous agent is added, and the viscous agent is preferably carboxymethylcellulose (CarboxymethylCellulose, CMC), stir it evenly to form a slurry, and then use a spray dryer to dry the slurry into a mixed powder with a particle size of 5-20 μm, and then put the powder into a high-temperature furnace and calcinate at 800 ° C for 1 Allow to cool naturally after an hour.

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Abstract

The invention relates to a lithium battery compound electrode active material, which comprises a lithium-containing main electrode active material and a lithium-containing cladding electrode active material which is covered on the outer layer of main electrode active material and of which the grain size is far smaller than that of the main electrode active material, wherein the grains of the cladding electrode active material are covered on and sintered with the outer layer surface of the grains of the main electrode active material. The invention also provides a method for preparing the compound electrode active material, which comprises: adding a viscous agent into the two kinds of grains to form slurry, atomizing, drying, obtaining mixed powder, and sintering in a short time to form compound electrode active material. The compound electrode active material can improve the conductivity and discharge power of a battery and further prolong the circulating life of the battery, and the preparation method is simple.

Description

technical field [0001] The invention relates to a battery electrode active material and a preparation method thereof, in particular to a lithium battery composite electrode active material and a preparation method thereof. Background technique [0002] The main structure of a lithium battery includes a positive electrode, a negative electrode, and a separator between the positive and negative electrodes; among them, the electrode material of the positive electrode is mainly active materials, and an appropriate amount of auxiliary materials and bonding materials are mixed to form a slurry and coated on For example, it is made on a current collector such as a metal foil or a metal mesh. The active material of the positive electrode is lithium cobalt composite oxide (LiCoO 2 ) was developed earlier, its synthesis is easy, and its performance and cycle life also meet the requirements of commodities, so it has been widely used. However, due to the limited development resources ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/139
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 杜侑达
Owner ショウゲン科技股ふん
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