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Preparation method of lithium-ion battery positive electrode material spherical nickel-cobalt-lithium aluminate

A nickel-cobalt lithium aluminate and lithium-ion battery technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problem of uneven distribution of particle elements, achieve good cycle stability, high tap density, and ensure spherification Effect

Active Publication Date: 2013-09-11
山东天骄新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention inherits the previous idea that nickel, cobalt and aluminum are precipitated separately in the process of precursor preparation, but in order to avoid problems such as uneven distribution of particle elements caused by the core-shell structure with discontinuous changes in components, a new method is provided. First prepare nano-aluminum sol with aluminum salt, and then add aluminum sol to it during co-precipitation with nickel and cobalt, and prepare nickel-cobalt lithium aluminate material with high vibration, high specific capacity and high cycle stability

Method used

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  • Preparation method of lithium-ion battery positive electrode material spherical nickel-cobalt-lithium aluminate
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  • Preparation method of lithium-ion battery positive electrode material spherical nickel-cobalt-lithium aluminate

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Experimental program
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Embodiment 1

[0032] (1) Preparation of aluminum sol: 20.4g (ie 0.1mol) aluminum isopropoxide (C 9 h 21 AlO 3 ) and deionized water to make an aqueous solution containing 10wt% aluminum isopropoxide, put it in a three-necked flask, and stir continuously for 4 hours in a water bath at 85°C. After the aluminum isopropoxide is fully hydrolyzed, slowly drop 1mol / L HNO 3 Solution, the pH value is controlled at about 3, the hydrolyzate is slowly peptized, and the stirring is continued to make it age for 20 hours, and an egg white-colored boehmite AlOOH sol with certain fluidity and clarity is obtained.

[0033](2) Preparation of nickel cobalt aluminum hydroxide precursor: mix nickel sulfate and cobalt sulfate according to n(Ni) / n(Co)=0.842:0.158, prepare 1L of 1mol / L aqueous solution, mix sodium hydroxide, ammonia water Make 1L of mixed alkali solution with concentrations of 2mol / L and 1mol / L respectively, then add mixed salt solution, aluminum sol (n(Ni+Co):n(Al)=0.95:0.05) and mixed alkali ...

Embodiment 2

[0037] (1) Preparation of aluminum sol: weigh 37.5g (ie 0.1mol) Al(NO 3 ) 3 9H 2 O was dissolved in deionized water to make a 1mol / L aqueous solution. After adding 100mL of 1mol / L ammonia water into the three-necked flask, it was placed in a water bath at 85°C and stirred continuously, and then the aforementioned aluminum nitrate solution was slowly dropped into it to form Precipitation; after reacting for 2 hours, add 1 mol / L nitric acid solution to it, control the pH value at 6, slowly peptize the precipitate, continue stirring to age for 20 hours, and obtain a clear AlOOH sol.

[0038] (2), (3) steps are the same as in Example 1, and the chemical composition is LiNi 0.80 co 0.15 al 0.05 o 2 nickel cobalt lithium aluminate powder.

[0039] After testing, the obtained nickel cobalt lithium aluminate tap density is 2.22g / cm 3 , the average particle size is 10.08μm, the discharge capacity is 177mAh / g, the first-round charge-discharge efficiency is 90%, and the capacity r...

Embodiment 3

[0041] (1) The preparation of aluminum sol is the same as in Example 1 (1);

[0042] (2) Preparation of nickel-cobalt-aluminum hydroxide precursor: when preparing the mixed salt solution of nickel sulfate and cobalt sulfate, mix according to n(Ni) / n(Co)=0.821:0.179, and the others are the same as in Example 1 (2);

[0043] (3) With embodiment 1 (3), obtain chemical composition and be LiNi 0.78 co 0.17 al 0.05 o 2 nickel cobalt lithium aluminate powder.

[0044] After testing, the obtained nickel cobalt lithium aluminate tap density is 2.26g / cm 3 , the average particle size is 10.28μm, the discharge capacity is 175mAh / g, the first cycle charge and discharge efficiency is 89%, and the capacity retention rate after 50 cycles is 93.7%.

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Abstract

The invention discloses a preparation method of lithium-ion battery positive electrode material spherical nickel-cobalt-lithium aluminate. The preparation method comprises the following steps of: firstly dissolving aluminum salt in deionized water, and preparing AlOOH aluminum sol by adding HNO3 or ammonium hydroxide and nitric acid; preparing nickel salt and cobalt salt into uniform aqueous solution according to a certain ratio; enabling the mixed salt solution to be collectively reacted with the aluminum sol and a mixed alkali solution, adjusting the pH value to be 9 to 12, controlling the reaction temperature, carrying out the solid-liquid separation after 20 to 30h of the reaction, and washing, filtering and drying the reaction product to obtain spherical nickel-cobalt-aluminum hydroxide precursor powder; then mixing the spherical nickel-cobalt-aluminum hydroxide precursor powder with lithium, sintering the mixture, and pulverizing and grading sintered material to obtain the lithium-ion battery positive electrode material spherical nickel-cobalt-lithium aluminate. The prepared spherical nickel-cobalt-lithium aluminate particles are controllable in shape and granularity, high in compacting density, high in specific discharge capacity, good in cycling stability and low in cost.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, in particular to a method for preparing spherical nickel-cobalt lithium aluminate, a positive electrode material of lithium ion batteries. Background technique: [0002] Since the advent of lithium-ion batteries, it has increasingly shown an important role in various fields, and battery materials have also achieved continuous development. With the continuous update and development of various electronic products, people have higher and higher requirements for lithium-ion batteries: battery life, longer service life, smaller size, lighter weight, etc. As an important part of lithium-ion batteries, battery cathode materials need to have high specific capacity, stable cycle performance, and good safety performance. LiNi 1-x co x o 2 (0.1≤x≤0.3) cathode material as LiNiO 2 and LiCoO 2 The solid solution has the advantages of both: high specific capacity, good cycle performance, low c...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 仇卫华段小刚丁倩倩
Owner 山东天骄新能源有限公司
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