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Ultrasonic assisted method for preparing precursor of ternary positive material of lithium ion battery

A lithium-ion battery, ultrasonic-assisted technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of low co-precipitation yield, poor crystal form integrity, narrow particle size distribution, etc., and achieve good cycle performance, low cost, The effect of high tap density

Active Publication Date: 2014-01-01
DALIAN RUIYUANPOWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned existing synthesis methods, and propose a method for ultrasonically assisted preparation of a lithium-ion battery ternary cathode material precursor, which has solved the problems of low co-precipitation yield, poor crystal form integrity, and low crystallinity. Disadvantages, at the same time, this is a preparation method with simple process, low cost, stable production, and environmental protection. The prepared product has the characteristics of high purity, good sphericity, narrow particle size distribution and high tap density

Method used

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  • Ultrasonic assisted method for preparing precursor of ternary positive material of lithium ion battery
  • Ultrasonic assisted method for preparing precursor of ternary positive material of lithium ion battery
  • Ultrasonic assisted method for preparing precursor of ternary positive material of lithium ion battery

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Embodiment 1

[0035] NiSO 4 , MnSO 4 , CoSO 4According to the molar ratio of Ni: Mn: Co=4:3:3, use a sulfuric acid solution with a pH value of 2.1 to assist ultrasonic dissolution to prepare a nickel-manganese-cobalt mixed solution with a total concentration of 2.0 mol / L, and prepare a 2.5 mol / L hydroxide Sodium solution, prepare an ammonia solution with a concentration of 0.5 mol / L, and use a metering pump to respectively input the nickel-cobalt-manganese salt solution, sodium hydroxide solution, and ammonia solution into a 1L reaction kettle with a certain bottom liquid added in advance for stirring and ultrasound Auxiliary co-precipitation reaction. Under the condition of nitrogen protection, the temperature of the reaction kettle is controlled at 50°C, the pH value is 11.5, the stirring speed is 600r / min, the ultrasonic frequency is 40kHz, and the power is 200W, until the feed liquid in the reaction kettle naturally overflows into the collection tank, the obtained precipitation, That...

Embodiment 2

[0037] NiSO 4 , MnSO 4 , CoSO 4 According to the molar ratio of Ni: Mn: Co=3:3:3, use a sulfuric acid solution with a pH value of 2.0 to assist ultrasonic dissolution to prepare a nickel-manganese-cobalt mixed solution with a total concentration of 1.0 mol / L, and prepare a 2 mol / L hydroxide Sodium solution, prepare an ammonia solution with a concentration of 3 mol / L, and use a metering pump to respectively input the nickel-cobalt-manganese salt solution, sodium hydroxide solution, and ammonia solution into a 1L reaction kettle with a certain bottom liquid in advance for stirring and ultrasound Auxiliary co-precipitation reaction. Under the condition of nitrogen protection, the temperature of the reaction kettle is controlled at 45°C, the pH value is 9.0, the stirring speed is 700r / min, the ultrasonic frequency is 30kHz, and the power is 500W, until the feed liquid in the reaction kettle naturally overflows into the collection tank, the obtained precipitation, That is, the ...

Embodiment 3

[0039] NiSO 4 , MnSO 4 , CoSO 4 According to the molar ratio of Ni:Mn:Co=5:2:3, the nickel-manganese-cobalt mixed solution was prepared by ultrasonic-assisted dissolution with a sulfuric acid solution with a pH value of 2.0. The total concentration was 3.0 mol / L, and a 5 mol / L hydroxide Sodium solution, prepare an ammonia solution with a concentration of 2.0 mol / L, and use a metering pump to respectively input the nickel-cobalt-manganese salt solution, sodium hydroxide solution, and ammonia solution into a 1L reaction kettle with a certain bottom liquid in advance for stirring and ultrasonic Auxiliary co-precipitation reaction. Under the condition of nitrogen protection, the temperature of the reaction kettle is controlled at 60°C, the pH value is 10.5, the stirring speed is 900r / min, the ultrasonic frequency is 20kHz, and the power is 800W, until the feed liquid in the reaction kettle naturally overflows into the collection tank, the obtained precipitation, That is, the c...

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Abstract

The invention discloses an ultrasonic assisted method for preparing the precursor of a ternary positive material of a lithium ion battery. The method disclosed by the invention comprises the following steps that under the protection of inert gas nitrogen, nickel, cobalt, and manganese in a metal mixed solution are continuously co-precipitated by using a sodium hydroxide and ammonium hydroxide mixed solution by means of mechanical stirring dispersion and ultrasonic wave assistance; the precipitated product grows and then overflows; the overflowed product is washed, and filtered to obtain fresh composite hydroxide precipitate of nickel, cobalt, and manganese; and the product is ultrasonically-assisted washed by using pure water, and dried in vacuum to obtain the precursor of the hydroxide of nickel, cobalt and manganese, which is good in degree of sphericity and high in purity. According to the method disclosed by the invention, the fresh hydroxide precipitate is treated by using the ultrasonic assisted method, the product is the composite hydroxide precursor, the content of the impurity ion is less, and the composite hydroxide precursor has the advantages of spherical shapes, narrow particle size distribution, high tap density and the like.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material precursor for a lithium-ion battery with spheroidization, in particular to an ultrasonic-assisted preparation method of a nickel-cobalt-manganese ternary positive electrode material precursor. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. Due to its advantages of high specific energy, high voltage, good cycle performance, small size, and flexible shape design, it has become the first choice for the power supply of more and more portable electronic products. Lithium-ion batteries are composed of positive and negative electrode materials, separators and electrolytes, among which positive electrode materials are an important part of lithium-ion batteries. LiCoO 2 As the earliest industrialized cathode material, it has the advantages of high compaction, good cycle performance, mature production technology, and stable product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G51/04C01G45/02H01M4/50H01M4/52
CPCY02E60/12Y02E60/10
Inventor 徐瑞全刘胜洋
Owner DALIAN RUIYUANPOWER CO LTD
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