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Titanium-doped high-nickel ternary lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in the field of titanium-doped high-nickel ternary lithium-ion battery positive electrode materials and its preparation, can solve problems such as uneven mixing of raw materials, and achieve stoichiometric ratios that can be accurately controlled and reproducible Good, uniform particle size distribution

Active Publication Date: 2021-07-16
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of solid phase mixing, uneven mixing of raw materials is easy to occur.

Method used

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  • Titanium-doped high-nickel ternary lithium ion battery positive electrode material and preparation method thereof
  • Titanium-doped high-nickel ternary lithium ion battery positive electrode material and preparation method thereof
  • Titanium-doped high-nickel ternary lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0029] A preparation method of a titanium-doped high-nickel ternary lithium-ion battery positive electrode material, comprising the steps of: dissolving aluminum salt in absolute ethanol and stirring to obtain solution 1, and then mixing nickel-cobalt binary precursor Ni 0.928 co 0.072 (OH) 2 Add the powder to solution 1 and stir evenly, then add titanium salt, stir evenly to obtain slurry 1; prepare solution 2, the volume ratio of deionized water and absolute ethanol in solution 2 is 1:2, add solution 2 to slurry 1, and stir Obtain the mixed slurry 2 uniformly, heat the mixed slurry 2 to 50°C-70°C and stir for 1-2h, age at room temperature, filter, and dry to obtain the ternary precursor; take the ternary precursor and LiOH·H 2 O is evenly mixed, where n(Li):n(Ni+Co+Al)=1.05:1, and is calcined in stages in an atmosphere furnace filled with oxygen, first at 450°C-550°C for 3.5-4.5h, then at 600°C Insulate at -800°C for 12-15 hours, and finally cool down to room temperature w...

Embodiment 1

[0037] Weighed 4.26g of aluminum isopropoxide (purity 99.99%), dissolved in 50mL of absolute ethanol, and stirred for 1.5h with a magnetic stirrer at room temperature at 1300 rpm to obtain solution 1. Then weigh 36.43g Ni 0.928 co 0.072 (OH) 2 Powder, add solution 1 and magnetically stir for 0.25h, then add titanium isopropoxide 1.88mL, continue magnetically stirring for 0.25h to obtain slurry 1. Prepare 60 mL of solution 2, wherein the volume ratio of deionized water and absolute ethanol in solution 2 is 1:2. Add solution 2 to slurry 1, continue magnetic stirring for 0.5h to obtain mixed slurry 2, heat up mixed slurry 2 to 60°C, stir at 1000rpm for 1.5h, age at room temperature for 24h, filter, and dry in a drying oven at 80°C Dry for 24 hours to obtain dry powder (ternary precursor). Take dry powder 18.98g and 9.18gLiOH·H 2 O mixed evenly, where n(Li):n(Ni+Co+Al)=1.05:1, calcined in stages in an atmosphere furnace filled with oxygen, first at 500°C for 4h, then at 700°C...

Embodiment 2

[0039] Weighed 4.26g of aluminum isopropoxide (purity 99.99%), dissolved in 50mL of absolute ethanol, and stirred for 1.5h with a magnetic stirrer at room temperature at 1300 rpm to obtain solution 1. Then weigh 36.43g Ni 0.928 co 0.072 (OH) 2 Powder, add solution 1 and magnetically stir for 0.25h, then add 0.63mL of titanium isopropoxide, continue magnetically stirring for 0.25h to obtain slurry 1. Prepare 60 mL of solution 2, in which the volume ratio of deionized water and absolute ethanol is 1:2. Solution 2 was added to slurry 1, and magnetic stirring was continued for 0.5 h to obtain mixed slurry 2. Raise the temperature to 60°C, stir at 1000rpm for 1.5h, age at room temperature for 24h, filter, and dry in a drying oven at 80°C for 24h to obtain dry powder (ternary precursor). Take dry powder 19.10g and 9.18gLiOH·H 2 O is evenly mixed, where n(Li):n(Ni+Co+Al)=1.05:1, and is calcined in stages in an atmosphere furnace filled with oxygen, first at 500°C for 4h, then at...

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Abstract

The invention discloses a titanium-doped high-nickel ternary lithium ion battery positive electrode material and a preparation method thereof. The preparation method of a titanium-doped high-nickel ternary lithium ion battery positive electrode material comprises the following steps: by taking aluminum salt and titanium salt as raw materials, coating the surface of a nickel-cobalt binary precursor with AlOOH and TiO(OH)2 through hydrolysis, obtaining a ternary precursor after the hydrolysis is completed, mixing the ternary precursor with lithium salt, respectively generating an aluminum compound and a titanium compound through high-temperature calcination and AlOOH and TiO(OH)2, and finally obtaining the titanium-doped high-nickel ternary lithium ion battery positive electrode material. According to the preparation method provided by the invention, the crystal structure of the material is stabilized by means of Al and Ti elements in the shell and the bulk phase, and the dissolution of transition metal ions in the active material in a long-term circulation process is avoided, so that the comprehensive electrochemical performance of the material is improved.

Description

Technical field: [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a titanium-doped high-nickel ternary lithium-ion battery cathode material and a preparation method thereof. Background technique: [0002] New energy vehicles are an important opportunity for my country's auto industry to achieve corner overtaking. From the perspective of technology route, pure electric vehicles have become the mainstream, and the sales of hybrid electric vehicles are also growing steadily. However, vehicles with technologies such as hydrogen fuel cells are still in the initial stage of development, and the development of electric vehicles is still the most important development at present. direction. [0003] The performance of the power battery is the limiting factor that determines the development of electric vehicles. At this stage, the popularization and development of electric vehicles is restricted by problems such as insufficient battery l...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 王英罗京肖方明唐仁衡毛贵洪
Owner GUANGDONG INST OF RARE METALS
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