High-nickel cathode material and preparation method thereof

A positive electrode material, high nickel technology, applied in the field of high nickel positive electrode material and its preparation, can solve the problems that are not considered, and achieve the effects of reducing surface impedance, improving cycle performance, and improving stability

Active Publication Date: 2019-05-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two mainstream methods demonstrated the impact of water washing on the surface morphology, crystal structure and electrochemical performance of materials from an academic point of view, and did not consider how to reduce the loss of material gram capacity on the basis of lowering pH after water washing, so that Ensure material energy density and corresponding cycle performance

Method used

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  • High-nickel cathode material and preparation method thereof
  • High-nickel cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Precursor Ni 0.83 co 0.12 mn 0.05 (OH) 2 and lithium hydroxide monohydrate in a high-speed mixer according to the molar ratio of Li / (Ni+Co+Mn) of 1.05, and then sintered at 790° C. for 15 hours in a pure oxygen atmosphere to obtain a base material.

[0030] Nano Al 2 o 3 (0.05wt%), nano ZrO 2 (0.1wt%) mixed with the base material at high speed and then annealed at 720°C for 5 hours to obtain a primary modified powder. During annealing, high-purity oxygen was introduced to ensure the sintering atmosphere. The deionized water and primary modified powder were dispersed and stirred for 5 minutes according to the mass ratio of 2:1, and then suction filtered, and the filtered material was dried in a vacuum oven at 120°C for 12 hours, and N 2 Perform atmosphere replacement.

[0031] TiO 2 (0.1wt%) and the washed and dried primary modified powder were uniformly mixed with a high-speed mixer, and then sintered at 600°C for 5 hours in a pure oxygen atmosphere to obtain a ...

Embodiment 2

[0034] Precursor Ni 0.83 co 0.12 mn 0.05 (OH) 2and lithium hydroxide monohydrate in a high-speed mixer according to the molar ratio of Li / (Ni+Co+Mn) of 1.05, and then sintered at 790° C. for 15 hours in a pure oxygen atmosphere to obtain a base material.

[0035] Nano Al 2 o 3 (0.1wt%), nano ZrO 2 (0.1wt%) mixed with the base material at high speed and then annealed at 720°C for 5 hours to obtain a primary modified powder. During annealing, high-purity oxygen was introduced to ensure the sintering atmosphere. The deionized water and primary modified powder were dispersed and stirred for 5 minutes according to the mass ratio of 2:1, and then suction filtered, and the filtered material was dried in a vacuum oven at 120°C for 12 hours, and N 2 Perform atmosphere replacement.

[0036] Will B 2 o 3 (0.1wt%) and the washed and dried primary modified powder were uniformly mixed with a high-speed mixer, and then sintered at 500°C for 5 hours in a pure oxygen atmosphere to obt...

Embodiment 3

[0039] Precursor Ni 0.83 co 0.12 mn 0.05 (OH) 2 and lithium hydroxide monohydrate in a high-speed mixer according to the molar ratio of Li / (Ni+Co+Mn) of 1.05, and then sintered at 790° C. for 15 hours in a pure oxygen atmosphere to obtain a base material.

[0040] Nano Al 2 o 3 (0.1wt%), nano ZrO 2 (0.2wt%) mixed with the base material at high speed and then annealed at 720°C for 5 hours to obtain a primary modified powder. During annealing, high-purity oxygen was introduced to ensure the sintering atmosphere. The deionized water and primary modified powder were dispersed and stirred for 5 minutes according to the mass ratio of 2:1, and then suction filtered, and the filtered material was dried in a vacuum oven at 120°C for 12 hours, and N 2 Perform atmosphere replacement.

[0041] TiO 2 (0.05wt%) and the washed and dried primary modified powder were uniformly mixed with a high-speed mixer, and then sintered at 500°C for 5 hours in a pure oxygen atmosphere to obtain a ...

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Abstract

The invention discloses a high-nickel cathode material and a preparation method thereof. A matrix material of the high-nickel cathode material is Lix(NiaCobMnc)O2 type NCM ternary material, wherein xis not less than 1.0 and not more than 1.06, a+b+c is equal to 1, and a is not less than 0.8. The preparation method is characterized by comprising a step of cladding a layer of surface-modified nano-crystalline metal oxide passivation layer on the matrix material, wherein the substance adopted by surface modification is low-melting point inorganic salt. A layer of nano-crystalline metal oxide passivation layer surface-modified through the low-melting point inorganic salt is covered on the matrix surface, the surface modification is accomplished by adopting twice annealing treatment in a ternary system for improving the nickel content, a crystal structure of the high-nickel cathode material is stabilized, and the material surface residual alkali content is reduced, the prepared high-nickelcathode material is high in capacity and good in circulation.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high-nickel positive electrode material and a preparation method thereof. Background technique [0002] The general chemical formula of the high-nickel layered cathode material is Li x (Ni a co b mn c )O 2 , where 1.00≤x≤1.09, a+b+c=1, a≥0.8, especially when the Ni element content is greater than 80%, the material exhibits high capacity characteristics greater than 180mAh / g, but the residual LiOH and Li on the surface of the material 2 CO 3 During electrode preparation, it reacts with binders, (PVDF), and organic solvents (NMP), resulting in jelly-like phenomenon during the mixing process. At present, in response to this problem, Korean scholar Jaephil Cho and his research group have found that annealing after washing is beneficial to LiNi 0.83 co 0.15 Al 0.02 o 2 The pH of the material can be significantly reduced, while the residual alkali on the sur...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 贾凯沈中宇李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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