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Coating technology of lithium cobalt oxide

A lithium cobalt oxide coating technology, applied in cobalt compounds, electrode manufacturing, inorganic chemistry, etc., can solve the problems affecting the electrical performance and cycle performance of positive electrode materials, the excessive growth of active material grains, and the uneven particle size of active materials, etc. problems, to achieve the effect of inhibiting excessive growth of grains, improving the uniformity of coating, and uniform components

Active Publication Date: 2015-07-01
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that, in order to ensure the uniformity of coating of the positive electrode material, the positive electrode material needs to be completely dissolved, the solvent usage is large, and the cost is high; The operation in production is difficult, and it is not suitable for mass production; in this method, when the hydrolyzed product M(OH)n is adsorbed on the surface of the active material, it is easy to cause excessive growth of the crystal grains of the active material, resulting in the particle size of the final active material being different. Uniformity affects its performance, and in this method, the positive electrode material is also directly roasted, which will also cause segregation of each component, and even lead to the precipitation of Li elements. Similarly, the roasting process of this method is a single roasting process. During the roasting process, the particles will burst due to violent drying, resulting in uneven particles, which will greatly affect the electrical properties and cycle performance of the coated positive electrode material

Method used

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  • Coating technology of lithium cobalt oxide
  • Coating technology of lithium cobalt oxide
  • Coating technology of lithium cobalt oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Weigh 98g of lithium cobalt oxide (M Lithium Cobalt Oxide :98 g / mol), based on the molar amount of lithium cobaltate (1mol), the total molar amount of metal ion compounds is 0.5% of the molar amount of lithium cobaltate, and the total molar amount of water-soluble organics is 50% of the molar amount of lithium cobaltate. % To measure metal ion compounds and water-soluble organic matter. Among them, the metal ion compound is magnesium oxide (M Magnesium Oxide :40 g / mol), water-soluble organic matter is glucose (M glucose : 180 g / mol), 0.2 g of magnesium oxide and 90 g of glucose are weighed.

[0038] (2) After mixing magnesium oxide and glucose evenly, add water with 10% (9 g) of glucose mass, and ball mill at 100 rpm for 5 hours to obtain primary slurry.

[0039] (3) Add lithium cobaltate and 30% glucose (27 g) water into the primary slurry, and ball mill at 50 rpm for 12 hours to obtain secondary slurry.

[0040] (4) Dry the secondary slurry, and the drying conditions ...

Embodiment 2

[0052] (1) Weigh 98g of lithium cobalt oxide (M Lithium Cobalt Oxide :98 g / mol), based on the molar amount of lithium cobaltate (1mol), the total molar amount of metal ion compounds is 1% of the molar amount of lithium cobaltate, and the total molar amount of water-soluble organics is 60 of the molar amount of lithium cobaltate. % Of the ratio of metal ion compounds and water-soluble organic matter, where the metal ion compounds are alumina and magnesium oxide (M Alumina :102 g / mol, M Magnesium Oxide :40 g / mol), each of alumina and magnesium oxide is 0.005mol, water-soluble organic matter is oxalic acid and citric acid (M oxalic acid :90 g / mol, M Citric acid :192 g / mol), oxalic acid and citric acid are each 0.3 mol, weighing aluminum oxide 0.51 g, magnesium oxide 0.2 g, oxalic acid 27 g, and citric acid 57.6 g.

[0053] (2) After mixing aluminum oxide, magnesium oxide, oxalic acid and citric acid uniformly, add 15% (12.69 g) water of the total mass of oxalic acid and citric ac...

Embodiment 3

[0061] (1) Weigh 98g of lithium cobalt oxide (M Lithium Cobalt Oxide :98 g / mol), based on the molar amount of lithium cobaltate (1mol), the total molar amount of metal ion compounds is 2% of the molar amount of lithium cobaltate, and the total molar amount of water-soluble organic matter is 70% of the molar amount of lithium cobaltate % To measure metal ion compounds and water-soluble organic compounds. Among them, metal ion compounds are alumina, magnesia and alum (M Alumina :102 g / mol, M Magnesium Oxide :40 g / mol, M alum :474 g / mol), each of alumina and magnesium oxide is 0.005mol, alum is 0.01mol, water-soluble organic matter is oxalic acid, glucose and acrylic acid (M oxalic acid :90 g / mol, M glucose :180 g / mol, M acrylic acid :72 g / mol), 0.3 mol of oxalic acid and glucose, 0.1 mol of acrylic acid, 0.51 g of alumina, 0.2 g of magnesium oxide, 4.74 g of alum, 27 g of oxalic acid, 54 g of glucose, and 7.2 g of acrylic acid.

[0062] (2) After mixing alumina, magnesia, alu...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a coating technology of lithium cobalt oxide. The coating technology of the lithium cobalt oxide includes the following steps of weighting out a certain amount of lithium cobalt oxide, measuring metal ionic compounds and water-solubility organics based on the molar weight of the lithium cobalt oxide according to ratios that the total molar weight of the metal ionic compounds is 0.5%-2% of the molar weight of the lithium cobalt oxide and the total molar weight of the water-solubility organics is 50%-70% of the molar weight of the lithium cobalt oxide, adding water to the metal ionic compounds and the water-solubility organics, conducting ball-milling to obtain primary slurry, adding the lithium cobalt oxide and water to the primary slurry, conducting the ball-milling to obtain secondary slurry, drying the secondary slurry, roasting the secondary slurry, and obtaining coated lithium cobalt oxide materials. The coating technology of the lithium cobalt oxide is simple in technology process, low in cost, appropriate for industrialization large batch production, and capable of effectively avoiding the phenomenon that metallic elements generate segregation in the high-temperature process. In addition, the lithium cobalt oxide obtained through the coating technology is even in particle, less in agglomeration, good in electrochemical performance, and high in stability in charge-discharge processes.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a coating process of lithium cobalt oxide. Background technique [0002] Among the currently commercialized cathode materials for lithium-ion batteries, lithium cobalt oxide (LiCoO 2 ) Due to the relatively stable electrochemical performance, good cycle performance, high voltage platform, and good compatibility with the electrolyte, the compaction density of the positive electrode diaphragm can reach 4.1g / cm 3 , and does not affect battery performance, it is the most widely used and most mature cathode material. [0003] However, lithium cobalt oxide in lithium-ion batteries, when the charging voltage is above 4.3V, Li x The structure of CoO begins to deform, and the thermal stability becomes poor, resulting in poor cycle performance, while the product CoO, which is completely delithiated from lithium cobaltate 2 The structural stability is very poor, and it is e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/04C01G51/00
CPCY02E60/122Y02E60/10
Inventor 颜雪冬曹长河潘美姿
Owner NINGBO VEKEN BATTERY
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