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Method for preparing Ti-doped and La4NiLiO8-coated nickel-rich positive electrode material

A positive electrode material, nickel-rich technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problem of reducing electrochemical performance, achieve the effect of promoting electron transfer, inhibiting side reactions, and reducing heat generation

Inactive Publication Date: 2019-12-13
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During cycling, the formation of cracks inside the secondary particles, the electrolyte penetrates the cracks, resulting in a lamellar transformation to the spinel phase, which degrades the electrochemical performance

Method used

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  • Method for preparing Ti-doped and La4NiLiO8-coated nickel-rich positive electrode material
  • Method for preparing Ti-doped and La4NiLiO8-coated nickel-rich positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Ti doping and La 4 NiLiO 8 Coated Li[Ni 0.888 co 0.097 Al 0.015 ]O 2 Preparation of nickel-rich material: 257.74g of NiSO 4 ·6H 2 O and 5.62 g of CoSO 4 ·7H 2 O was dissolved in deionized water; 76 g of NaOH solution and 38.5 g of ammonia water were added to the reactor, and then NiSO 4 and CoSO 4 Solution is added in the reactor under the protection of nitrogen, obtains [Ni 0.98 co 0.02 ](OH) 2 Precursor.

[0017] Dissolve 102g of tetrabutyl titanate and 31.6g of lanthanum acetate in 60mL of ethanol, place the solution in a 60°C water bath and stir to dissolve completely, and dissolve 570g of [Ni 0.98 co 0.02 ](OH) 2 , 393.38 g of LiOH·H 2 O, 11.57g of Al(OH) 3 ·3H 2 O solution, add tetrabutyl titanate and lanthanum acetate mixed liquid and stir, then filter the solution, dry, and calcined at 700° C. for 12 hours. Finally get Li[Ni 0.888 co 0.097 Al 0.015 ]O 2 -1.

Embodiment 2

[0019] Ti doping and La 4 NiLiO 8 Coated Li[Ni 0.888 co 0.097 Al 0.015 ]O 2 Preparation of nickel-rich material: 257.74g of NiSO 4 ·6H 2 O and 5.62 g of CoSO 4 ·7H 2 O was dissolved in deionized water; 76g of NaOH solution and 42g of ammonia water were added to the reactor, and then NiSO 4 and CoSO 4 Solution is added in the reactor under the protection of nitrogen, obtains [Ni 0.98 co 0.02 ](OH) 2 Precursor,

[0020] Dissolve 160g of tetrabutyl titanate and 54g of lanthanum acetate in 60mL of ethanol, place the solution in a water bath at 60°C and stir to dissolve it completely, and dissolve 753g of [Ni 0.98 co 0.02 ](OH) 2 , 371.7g of LiOH·H 2 O, 18g of Al(OH) 3 ·3H 2 O solution, add tetrabutyl titanate and lanthanum acetate mixed solution and stir, then filter, dry and calcinate the solution at 730° C. for 10 h. Finally get Li[Ni 0.888 co 0.097 Al 0.015 ]O 2 -2.

Embodiment 3

[0022] Ti doping and La 4 NiLiO 8 Coated Li[Ni 0.888 co 0.097 Al 0.015 ]O 2 Preparation of nickel-rich material: 257.74g of NiSO 4 ·6H 2 O and 5.62 g of CoSO 4 ·7H 2 O was dissolved in deionized water; 80 g of NaOH solution and 42 g of ammonia water were added to the reactor, and then NiSO 4 and CoSO 4 Solution is added in the reactor under the protection of nitrogen, obtains [Ni 0.98 co 0.02 ](OH) 2 Precursor.

[0023] Dissolve 238g of tetrabutyl titanate and 150g of lanthanum acetate in 60mL of ethanol, place the solution in a water bath at 60°C and stir to dissolve it completely, and dissolve 729.52g of [Ni 0.98 co 0.02 ](OH) 2 , 375.57 g of LiOH·H 2O, 23.14g of Al(OH) 3 ·3H 2 O solution, add tetrabutyl titanate and lanthanum acetate mixed solution and stir, then filter the solution, dry, and calcined at 750° C. for 8 hours. Finally get Li[Ni 0.888 co 0.097 Al 0.015 ]O 2 -3.

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Abstract

The invention discloses a method for preparing Ti-doped and La4NiLiO8-coated nickel-rich positive electrode material, and belongs to the technical field of lithium battery preparation. The nickel-richpositive electrode material is doped with tetrabutyl titanate and lanthanum acetate by high-temperature calcination. The Ti-doped and La4NiLiO8-coated nickel-rich positive electrode material can suppress the generation and expansion of microcracks. In addition, the La4NiLiO8 coating can help reduce the interface resistance of the material and improve the lithium ion diffusion capacity of the nickel-rich material.

Description

technical field [0001] The present invention designs the preparation method of positive electrode material of lithium ion battery, specifically relates to a kind of Ti doping and La 4 NiLiO 8 A method for preparing a coated nickel-rich cathode material. Background technique [0002] Since the theoretical capacity (276mAh / g) of the nickel-rich cathode material is higher than that of LiFePO 4 (175mAh / g) and LiMn 2 o 4 (145mAh / g), and its excellent cycle stability and low cost characteristics make nickel-rich cathode materials considered to be the most promising next-generation lithium-ion power battery cathode materials to replace LiFePO4 and LiCoO2. [0003] However, nickel-rich cathode materials have problems such as poor interface stability and internal structure degradation of secondary particles, which still hinder the commercialization of nickel-rich cathode materials. Studies have shown that the direct contact of high-valent nickel ions and organic electrolytes inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 杨志远蔡浩王聪张天赐
Owner 湖北锂诺新能源科技有限公司
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