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Preparation method of high-compaction spherical ternary cathode material

A positive electrode material, spherical technology, applied in the field of preparation of high vibration spherical ternary positive electrode material, can solve the problem of low packing density and achieve the effect of low cost

Inactive Publication Date: 2013-04-17
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the ternary cathode materials reported in China are formed of irregular flaky or granular particles, and the packing density is low, which is mainly affected by the precursor of the ternary cathode material. Improving the physical and chemical properties of the precursor is particularly critical for improving the performance of the ternary cathode material.

Method used

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  • Preparation method of high-compaction spherical ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] NiSO 4 , MnSO 4 , CoSO 4 According to the molar ratio Ni: Mn: Co = 1: 1: 1, the mixed aqueous solution of nickel salt, manganese salt and cobalt salt is prepared, and the total concentration is 3.0 mol / L. In addition, 6.0 mol / L sodium hydroxide solution is prepared, and the metering pump is used to press Input the mixed salt solution of nickel, cobalt and manganese, sodium hydroxide solution and DMSO solution with a purity of 97% into the pre-filled 10cm 3 The reaction was carried out in a reactor with deionized water.

[0024] Under the protective condition of argon, the temperature of the reaction kettle is controlled to be 50°C, the flow rate of the alkali is controlled to make the pH value 11.0, the stirring speed is 500r / min, the solid content of the mother liquor is controlled to be 250mg / L, and the solid content of the liquid in the reaction kettle is controlled. The content is 450g / L, the feed liquid of the reactor is naturally discharged, the feed is continu...

Embodiment 2

[0027] Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 According to the molar ratio Ni:Mn:Co=4:4:2, prepare a mixed aqueous solution of nickel salt, manganese salt, cobalt salt, and the total concentration is 2.5mol / L. In addition, prepare a 5mol / L potassium hydroxide solution, and use a metering pump to measure Input nickel, cobalt, manganese mixed salt solution, potassium hydroxide solution and DMSO solution with a purity of 97% into the pre-filled 10cm 3 The reaction was carried out in a reactor with deionized water.

[0028] Under the condition of nitrogen protection, the temperature of the reaction kettle is controlled to be 60°C, the flow rate of the alkali is controlled so that the pH value is 10.5, the stirring speed is 600r / min, the solid content of the mother liquor is controlled to be 200mg / L, and the solid content of the feed liquid in the reaction kettle is controlled to be 400g / L, the reaction kettle feed liquid is discharged naturally, continuous feeding for 25 ho...

Embodiment 3

[0031] NiCl 2 , MnCl 2 , CoCl 2 According to the molar ratio Ni:Mn:Co=5:3:2, a mixed aqueous solution of nickel salt, manganese salt, and cobalt salt was prepared, with a total concentration of 2.5mol / L. In addition, a 5mol / L sodium hydroxide solution was prepared, and a metering pump was used to measure Input nickel, cobalt, manganese mixed salt solution, sodium hydroxide solution, and DMSO with a purity of 97% into the pre-filled 10m 3 The reaction was carried out in a reactor with deionized water.

[0032] Under the protection of helium, control the temperature of the reactor to 55°C, control the flow rate of the alkali to make the pH value 10.5, the stirring speed to 550r / min, control the solid content of the mother liquor to 260mg / L, and control the solid content of the liquid in the reactor 400g / L, the reaction kettle feed liquid is naturally discharged, continuous feeding for 35h, stop feeding, transfer the material in the reaction kettle to the aging tank, add 3mol / ...

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Abstract

The invention relates to the preparation of a cathode active material of a lithium ion battery, in particular to a preparation method of a high-compaction spherical ternary cathode material. The preparation method is characterized by comprising the following steps: (1) firstly, synthesizing a precursor, wherein the specific step is that firstly deionized water, which is used as base solution, is added to a reaction kettle, and nickel salt, cobalt salt and manganese salt mixed solution, as well as an aqueous alkaline solution and a complexing agent is added into the reaction kettle at a volume ratio of (15-20):(15-20):1 at the same time; (2) stirring for performing surface treatment, and then performing filtrating to obtain a final precursor of the ternary cathode material after drying; and (3) uniformly mixing the obtained final precursor and lithium carbonate at a molar ratio of 1: (0.5-0.525) to be sintered and finally cooled. The method has the advantage that the preparation process can control the morphology and the particle size of the precursor, and is low in cost, non-pollution, and suitable for industrialized production.

Description

technical field [0001] The invention relates to the preparation of positive electrode active materials of lithium ion batteries, especially the preparation method of high-tap spherical ternary positive electrode materials. Background technique [0002] Cathode materials are an important part of lithium-ion batteries. At present, the anode material of industrialized lithium-ion batteries is LiCoO 2 , the research is relatively mature, and the comprehensive performance is excellent, but the price is expensive, the toxicity is high, and the safety performance is flawed. Especially under the condition of overcharge, the material is unstable and easy to react with the electrolyte, and the application field is greatly affected; in addition, LiCoO 2 Only half of the lithium can be reversibly intercalated and removed, and the actual reversible capacity is about 145mAh / g, which limits the increase in the capacity of lithium-ion batteries and cannot meet the needs of power supply bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 李俊
Owner IRICO
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