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

A technology for lithium aluminum nickel cobalt oxide and lithium ion battery, which is applied in the field of preparation of spherical aluminum-doped nickel cobalt oxide lithium ion battery cathode material, and can solve the problem of poor structural stability, difficult to filter flocculent precipitates, and difficult to form spherical large particle precipitates. and other problems, to achieve the effects of low cost, high tap density, controllable particle size distribution and morphology

Active Publication Date: 2011-05-25
深圳市费特森新能源有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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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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Embodiment 1

[0033] First, the nickel sulfate, cobalt sulfate and aluminum sulfate are massaged by Ni 2+ : Co 2+ : Al 3+ =0.7:0.25:0.05 was mixed to prepare 1mol / L aqueous solution, potassium persulfate was prepared into 2mol / L aqueous solution, potassium hydroxide was prepared into 3mol / L solution 2L, and 0.5L 0.75mol / L ammonia was added. Then add the prepared mixed salt solution and potassium persulfate solution into a 12L reactor with a stirring device at a flow rate of 10ml / min, stir at 450rpm and heat to 35°C, 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 is finished after 8 hours, and then the spherical nickel cobalt aluminum oxyhydroxide precursor is filtered out. The spherical nickel cobalt aluminum oxyhydroxide was washed and filtered with deionized water for 6 times, and dried in a vacuum drying oven at 120° C. for 12 hours to obtain a precursor. The scanning electron micrograph of the precursor...

Embodiment 2

[0036] According to the method of Example 1, the nickel cobalt aluminum oxyhydroxide precursor and the lithium salt were mixed and calcined at 750° C. for 10 hours, and then crushed and classified after cooling to obtain spherical aluminum-doped lithium nickel cobalt oxide materials.

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

Embodiment 3

[0039] First, the nickel sulfate, cobalt sulfate and aluminum sulfate are massaged by Ni 2+ : Co 2+ : Al 3+ =0.75:0.2:0.05 was mixed to prepare a 2mol / L aqueous solution, ammonium persulfate was prepared into a 3mol / L aqueous solution, lithium hydroxide was prepared into a 5mol / L solution 2L and 0.5L 1.5mol / L ammonia was added. Then add the prepared mixed salt solution and ammonium persulfate solution into a 12L reactor with a stirring device at a flow rate of 10ml / min in parallel, stir at 550rpm and heat to 50°C, adjust the feed of the alkali solution The speed is used to control the pH value of the reaction system between 10.5-11, and the reaction is finished after 8 hours, and then the spherical nickel cobalt aluminum oxyhydroxide precursor is filtered out. The spherical nickel cobalt aluminum oxyhydroxide was washed and filtered with deionized water for 6 times, and dried in a vacuum drying oven at 120° C. for 12 hours to obtain a precursor. Then, the lithium hydroxide and ...

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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 spherical aluminum-nickel-cobaltate lithium-ion battery cathode materials. Background technique: [0002] As a green secondary battery, lithium-ion battery has the advantages of light weight, small size, high discharge platform, large capacity, long cycle life, and no memory effect. It has been widely used in mobile electronic appliances such as mobile phones, cameras, notebook computers, etc. At the same time, it is increasingly being 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 low environmental pollution. But this material still has Ni 2+ Difficult to completely oxidize to Ni 3+ Which leads to Ni 2+ With Li + The "cation mixing" phenomenon, poor thermal stability and high first di...

Claims

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Application Information

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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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