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Method for inhibiting twin crystals of nickel-cobalt-manganese ternary precursor

A technology of nickel-cobalt-manganese and precursors, applied in chemical instruments and methods, electrical components, nickel compounds, etc., can solve the problems of battery capacity attenuation, large gap, and intensified side reactions, etc., to achieve increased dispersion, uniform particles, good sphericity

Pending Publication Date: 2021-03-05
JINGMEN GEM NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The contact between the positive electrode material containing microcracks and the electrolyte will intensify its side reaction with the electrolyte, which will cause serious capacity fading of the battery. The existence of twins also makes the gap between the particles of the positive electrode material larger, making it difficult to obtain a higher capacity. Compaction density, resulting in low volumetric energy density of the battery

Method used

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  • Method for inhibiting twin crystals of nickel-cobalt-manganese ternary precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare the nickel-cobalt-manganese ternary solution with a concentration of 80g / L, the liquid caustic soda with a mass fraction of 30%, the ammonia solution with a mass fraction of 15%, and the water-soluble dispersant solution with a mass fraction of 30%. The water-soluble dispersant solution is a mixture of sodium lauryl sulfate and hydroxyl silicone oil emulsion, and the molar ratio of sodium lauryl sulfate to hydroxyl silicone oil is 1:2.

[0025] to 6.5m 3 Add 4.0m to the reaction kettle 3 Pure water, 200L mass fraction of 15% ammonia solution, 30L mass fraction of 30% liquid caustic soda are mixed with pH 10.2, ammonia concentration is 8.5g / L, and total alkalinity is 20g / L. Nitrogen gas is introduced into the reaction kettle with bottom liquid, and the flow rate of nitrogen gas into the reaction kettle with bottom liquid is 0.5m 3 / h. Heat the reaction kettle with bottom liquid to 50°C.

[0026] The nickel-cobalt-manganese ternary solution, liquid caustic sod...

Embodiment 2

[0029] Prepare the nickel-cobalt-manganese ternary solution with a concentration of 100g / L, the liquid caustic soda with a mass fraction of 32%, the ammonia solution with a mass fraction of 16%, and the water-soluble dispersant solution with a mass fraction of 35%. The water-soluble dispersant solution is a mixture of sodium lauryl sulfate and hydroxyl silicone oil emulsion, and the molar ratio of sodium lauryl sulfate to hydroxyl silicone oil is 1:2.

[0030] to 6.5m 3 Add 4.2m to the reactor 3 Pure water, 230L mass fraction is 16% ammonia solution, 55L mass fraction is 32% liquid caustic soda, is made into the bottom liquid that pH is 11.0, ammonia concentration is 10.4g / L, and total alkalinity is 24g / L, to adding Nitrogen gas is passed into the reactor with bottom liquid, and the flow rate of nitrogen gas into the reactor with bottom liquid is 1.5m 3 / h. Heat the reaction kettle with bottom liquid to 55°C.

[0031] The nickel-cobalt-manganese ternary liquid, liquid caus...

Embodiment 3

[0034] Prepare the nickel-cobalt-manganese ternary solution with a concentration of 120g / L, the liquid caustic soda with a mass fraction of 40%, the ammonia solution with a mass fraction of 25%, and the water-soluble dispersant solution with a mass fraction of 60%. The water-soluble dispersant solution is a mixture of sodium lauryl sulfate and hydroxyl silicone oil emulsion, and the molar ratio of sodium lauryl sulfate to hydroxyl silicone oil is 1:2.

[0035] to 6.5m 3 Add 4.5m to the reaction kettle3 Pure water, 400L mass fraction are 25% ammonia solution, 60L mass fraction is 40% liquid caustic soda, be made into the base liquid that pH is 11.8, ammonia concentration is 10.5g / L, and total alkalinity is 28g / L, to adding Nitrogen gas is passed into the reactor with bottom liquid, and the flow rate of nitrogen gas into the reactor with bottom liquid is 2.0m 3 / h. Heat the reaction kettle with bottom liquid to 70°C.

[0036] The nickel-cobalt-manganese ternary liquid, liquid...

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Abstract

The invention discloses a method for inhibiting twin crystals of a nickel-cobalt-manganese ternary precursor. The method comprises the following steps: respectively preparing a nickel-cobalt-manganeseternary solution, liquid caustic soda, an ammonia water solution and a water-soluble dispersing agent solution; adding pure water, the ammonia water solution and liquid caustic soda into a reaction kettle to prepare a base solution, introducing nitrogen into the reaction kettle added with the base solution, and heating the reaction kettle added with the base solution; adding the nickel-cobalt-manganese ternary liquid, liquid caustic soda, the ammonia water solution and the water-soluble dispersing agent solution into the reaction kettle added with the base solution in a parallel flow manner,starting to stir the reaction kettle added with the base solution, discharging the obtained nickel-cobalt-manganese ternary precursor crude product with the target particle size into an aging tank, performing washing, removing impurities, performing dehydrating, performing drying, performing mixing, performing screening, removing iron and performing packaging to obtain a nickel-cobalt-manganese ternary precursor finished product. According to the preparation method, precursor twin crystals can be reduced, the prepared ternary precursor is uniform in particle and good in sphericity, and secondary particles are free of obvious twin crystal interfaces and microcracks in appearance.

Description

technical field [0001] The invention belongs to the field of synthesis of precursors of new energy battery materials, and in particular relates to a method for suppressing the twinning of nickel-cobalt-manganese ternary precursors. Background technique [0002] The nickel-cobalt-manganese ternary precursor is the most important raw material for the preparation of lithium-ion battery cathode materials. The main preparation method of the ternary precursor is to add nickel-cobalt-manganese metal salt solution, liquid caustic soda, and ammonia water into the reactor at the same time for co-precipitation reaction. Due to limitations of equipment and process conditions, there are usually twins in the nucleation process of co-precipitation reactions (twins refer to crystals in which two crystals form a mirror-symmetric orientation relationship along a common crystal plane, and the common crystal plane is called a twin plane. ), the twin crystal nuclei gradually grow up to form elli...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M4/62H01M10/0525C01P2004/32C01P2004/61C01P2006/40Y02E60/10
Inventor 许开华代凯吕志陈永安杨琪龚雪姣杨开周林黎修军
Owner JINGMEN GEM NEW MATERIAL