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Process for preparing high density spherical nickel-cobalt lithium manganate as anode material of lithium ion cell

A technology for nickel cobalt lithium manganate and lithium ion batteries, which is applied in the field of energy material preparation, can solve the problems of low bulk density, low bulk density, and insufficient and uniform mixing of elements, and achieves high bulk density and improved performance.

Inactive Publication Date: 2005-06-01
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

This method has obvious shortcomings. First, the three elements of nickel, cobalt, and manganese cannot be fully and uniformly mixed, and their respective effects cannot be fully exerted.
The second is that the synthesized powder material is composed of irregular particles with low bulk density, and the general tap density is only 1.6-1.8g / cm 3 , than lithium cobaltate (general tap density 2.2-2.5g / cm 3 , as high as 2.8-2.9g / cm 3 ) is much lower, and the low bulk density makes the volume specific capacity of lithium cobalt manganese oxide much lower than that of lithium cobalt oxide, which has no advantage at all, which hinders the practical application of this material
So far, spherical nickel cobalt lithium manganese oxide has not been reported in the literature

Method used

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preparation example Construction

[0020] The invention provides a method for preparing high-density spherical nickel-cobalt lithium manganese oxide, which is composed of spherical or quasi-spherical particles, has high packing density and high specific capacity. The method is to first react nickel salt, cobalt salt, manganese salt with sodium hydroxide and ammonia in aqueous solution to synthesize spherical or quasi-spherical nickel hydroxide cobalt manganese Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 The precursor is uniformly mixed with lithium carbonate after washing and drying, and subjected to high-temperature heat treatment at 750-950° C. for 8-48 hours in the air to obtain spherical nickel-cobalt lithium manganese oxide. The specific implementation method of the present invention comprises the following steps:

[0021] 1) Prepare a mixed aqueous solution of nickel salt, cobalt salt and manganese salt with a total metal ion concentration of 0.6-3 mol / liter, wherein Ni:Co:Mn=1:1:1 (molar ratio).

[0022] 2) Prepare ...

Embodiment 1

[0032] The concentration of nickel nitrate is 1 mol / liter, the concentration of cobalt nitrate is 1 mol / liter, and the mixed aqueous solution of nickel-cobalt-manganese salt is 1 mol / liter of manganese nitrate, and the concentration of sodium hydroxide is 10 mol / liter. 10 mol / L ammonia solution. The nickel-cobalt-manganese salt mixed aqueous solution, the sodium hydroxide aqueous solution, and the ammonia aqueous solution were respectively input into a reactor with a capacity of 3 liters filled with deionized water with a metering pump for reaction. Control the flow of nickel-cobalt-manganese salt mixed aqueous solution to be 120 ml / hour, control the flow of ammonia solution, make the NH in the reactor 3 / (Ni+Co+Mn)=0.5. Regulate the flow rate of the aqueous sodium hydroxide solution to control the pH value of the reaction solution in the reactor to 11.5. The temperature inside the reactor was controlled to be 45°C. The mixed material in the reactor naturally overflows into...

Embodiment 2

[0034] The concentration of nickel sulfate is 0.6 mol / liter, the concentration of cobalt sulfate is 0.6 mol / liter, and the mixed aqueous solution of nickel cobalt manganese salt is 0.6 mol / liter in manganese sulfate concentration, and the sodium hydroxide aqueous solution with concentration of 3.6 mol / liter is prepared. 5 mol / L ammonia solution. The nickel-cobalt-manganese salt mixed aqueous solution, the sodium hydroxide aqueous solution, and the ammonia aqueous solution were respectively input into a reactor with a capacity of 3 liters filled with deionized water with a metering pump for reaction. Control the flow of nickel-cobalt-manganese salt mixed aqueous solution to be 120 ml / hour, control the flow of ammonia solution, make the NH in the reactor 3 / (Ni+Co+Mn)=0.8. Regulate the flow rate of the aqueous sodium hydroxide solution to control the pH value of the reaction solution in the reactor to 11.0. The temperature inside the reactor was controlled to be 45°C. The mix...

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Abstract

The present invention relates to energy source material technology, and is preparation process of high density spherical lithium nickel-cobalt-manganate as positive electrode material for lithium ion cell. The preparation process includes the reaction of nickel salt, cobalt salt, manganese salt, ammonium hydroxide and ammonian in water solution to synthesize spherical or spheroid precursor Ni1 / 3Co1 / 3Mn1 / 3 (OTHER)2, washing, drying and mixing with lithium carbonate; and high temperature treatment in the air at 750-950 deg.c for 8-48 hr to obtain spherical lithium nickel-cobalt-manganate. The spherical lithium nickel-cobalt-manganate has great bulk density reaching 2.25-2.50 g / cu cm after vibration densifying, average grain size of 3-7 microns, and reversible specific capacity up to 172-185 mA.hr / g.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation, and in particular relates to a method for preparing high-density spherical nickel-cobalt lithium manganese oxide, a cathode material of a lithium ion battery. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile phones, notebook computers, UPS, Camcorders, various portable electric tools, electronic instruments, weapons and equipment, etc. also have good application prospects in electric vehicles, and are considered to be high-tech products that are of great significance to the national economy and people's lives in the 21st century. [0003] Cathode materials are an important part of lithium-ion batteries. Currently, the most studied ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00C01G1/02C01G45/00C01G51/00C01G53/00H01M4/04H01M4/48H01M4/50H01M4/52H01M4/58H01M10/36
CPCC01G45/1228C01G51/006C01G51/50C01G53/006C01G53/50C01P2004/32C01P2004/61C01P2006/10C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 应皆荣姜长印万春荣陈克勤
Owner TSINGHUA UNIV
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