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Method for preparing spherical aluminum-doped nickel lithium carbonate for lithium ion battery positive electrode material

A technology for lithium-alnico-cobaltate and lithium-ion batteries, which is applied in the field of preparation of spherical aluminum-nickel-cobaltate lithium-doped lithium-ion battery anode materials, and can solve the problems of poor structural stability, difficulty in filtering flocculent precipitates, and difficulty in forming spherical large particle precipitates problems such as low cost, high tap density, controllable particle size distribution and shape

Active Publication Date: 2013-04-17
深圳市费特森新能源有限责任公司
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Problems solved by technology

However, there are also some disadvantages in this conventional liquid-phase oxidation co-precipitation method, such as trivalent ion precipitation, which is easy to form flocculent precipitates, which is difficult to filter, and it is also difficult to form spherical large particle precipitates.
In addition, the above-mentioned patents synthesize Ni without aluminum 1-x co x Precipitation of OOH, lithium-nickel-cobalt-oxygen obtained by lithium-doped calcination is poorer in structural stability than lithium-nickel-cobalt-aluminum-oxygen, and the discharge capacity is only about 140mAh / g

Method used

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  • Method for preparing spherical aluminum-doped nickel lithium carbonate for lithium ion battery positive electrode material
  • Method for preparing spherical aluminum-doped nickel lithium carbonate for lithium ion battery positive electrode material
  • Method for preparing spherical aluminum-doped nickel lithium carbonate for lithium ion battery positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0033] First, nickel sulfate, cobalt sulfate and aluminum sulfate are mixed in molar ratio Ni 2+ :Co 2+ : Al 3+ =0.7: 0.25: 0.05 is mixed and formulated into a 1mol / L aqueous solution, potassium persulfate is formulated into a 2mol / L aqueous solution, potassium hydroxide is formulated into 3mol / L solution 2L and 0.5L of 0.75mol / L ammoniacal liquor is added. Then, the prepared mixed salt solution and potassium persulfate solution are added into a 12L reaction kettle with a stirring device at a flow rate of 10ml / min, stirred at a speed of 450rpm and heated to 35°C to adjust the feed of the alkali solution The speed is to control the pH value of the reaction system between 11-11.5, and the reaction ends after 8 hours, and then the spherical nickel-cobalt-aluminum oxyhydroxide precursor is filtered out. Then, the spherical nickel-cobalt-aluminum oxyhydroxide was washed and filtered with deionized water for 6 times, and dried in a vacuum oven at 120° C. for 12 hours to obtain a p...

Embodiment 2

[0036] According to the method of Example 1, the precursor of nickel-cobalt-aluminum oxyhydroxide was mixed with lithium salt and then calcined at 750° C. for 10 h. After cooling, it was crushed and classified to obtain a spherical aluminum-nickel-cobalt-doped lithium material.

[0037] After inspection, the tap density of the aluminum-nickel-cobalt oxide is 2.21g / cm 3 , the average particle size is 9.127μm, the initial capacity is 184mAh / g, the first charge and discharge efficiency is 90%, and the capacity retention rate after 300 cycles is 86%.

Embodiment 3

[0039] First, nickel sulfate, cobalt sulfate and aluminum sulfate are mixed in molar ratio Ni 2+ :Co 2+ : Al 3+ =0.75: 0.2: 0.05 is mixed and formulated into 2mol / L aqueous solution, ammonium persulfate is formulated into 3mol / L aqueous solution, lithium hydroxide is formulated into 5mol / L solution 2L and adds 0.5L 1.5mol / L ammoniacal liquor. Then, the prepared mixed salt solution and ammonium persulfate solution are all fed into a 12L reaction kettle with a stirring device at a flow rate of 10ml / min, stirred at a speed of 550rpm and heated to 50°C to adjust the feed of the alkali solution The speed is to control the pH value of the reaction system between 10.5-11, and the reaction ends after 8 hours, and then the spherical nickel-cobalt-aluminum oxyhydroxide precursor is filtered out. Then, the spherical nickel-cobalt-aluminum oxyhydroxide was washed and filtered with deionized water for 6 times, and dried in a vacuum oven at 120° C. for 12 hours to obtain a precursor. Aft...

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Abstract

The invention relates to a method for preparing spherical aluminum-doped nickel lithium carbonate for a lithium ion battery positive electrode material by combining liquid phase oxidation and crystallization controlling. Through controlling of the preparation technique, firstly synthesizing a spherical hydroxyl oxygenized nickel cobalt aluminum precursor with high density, and then calcining at the temperature of 500-800 DEG C for 10-24 hours in a flow oxygen gas atmosphere after mixing the precursor with a lithium source, thus acquire the spherical aluminum-doped nickel lithium carbonate with high density. The synthesized aluminum-doped nickel lithium carbonate is in a single spherical shape, has good stacking density, and can be used for improving the volume ratio capacity of a battery.The aluminum-doped nickel lithium carbonate prepared by the method in the invention has the advantages of high specific capacity and good loop stability. The method provided by the invention has the advantages of simple technique, low cost, less pollution, good product performance and suitability for industrialized production.

Description

technical field [0001] The invention relates to a method for preparing a spherical aluminum-nickel-cobalt-doped lithium lithium ion battery cathode material. Background technique: [0002] As a green secondary battery, lithium-ion batteries have the advantages of light weight, small size, high discharge platform, large capacity, long cycle life, and no memory effect. They have been widely used in mobile electronic appliances such as mobile phones, cameras, and notebook computers. , At the same time, it is increasingly used in artificial satellites, aerospace, electric vehicles and other fields. LiNi x co 1-x o 2 (0.7≤x≤0.9) cathode material as LiNiO 2 and LiCoO 2 The solid solution has the advantages of both, that is, high discharge specific capacity, good cycle performance, low cost and less environmental pollution. But this material still has Ni 2+ Difficult to completely oxidize to Ni 3+ resulting in the high temperature crystallization process of Ni 2+ with Li ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 胡国荣刘万民彭忠东杜柯曹雁冰蒋庆来刘强
Owner 深圳市费特森新能源有限责任公司
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