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Cobalt-free positive electrode material and preparation method thereof

A cathode material and cathode technology, applied in the field of cobalt-free cathode materials and their preparation, can solve the problems of practical application limitations, large cobalt-free materials, large expansion force, etc.

Pending Publication Date: 2021-05-11
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The study found that the cobalt-free material generates a large amount of gas during the high-temperature cycle, and the gas generation causes the outer package to bear a large expansion force, which poses a safety hazard and limits practical applications.

Method used

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  • Cobalt-free positive electrode material and preparation method thereof
  • Cobalt-free positive electrode material and preparation method thereof
  • Cobalt-free positive electrode material and preparation method thereof

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Embodiment 1

[0055] This embodiment provides a method for preparing a cobalt-free positive electrode material, the preparation method comprising the following steps:

[0056] (1) Lithium hydroxide, precursor Ni 0.5 mn 0.5 (OH) 2 and WO 3 After mixing, put it in an oxygen atmosphere, and sinter at 600°C for 15 hours to obtain a block material. The molar ratio of Li / (Ni+Mn) is 0.95 for mixing, and the D50 particle size of the precursor is 2 μm; The material is pulverized to obtain cobalt-free cathode particles with a particle size of 2 μm;

[0057] (2) Cobalt-free positive electrode particles, magnesium oxide and graphite are mixed and then dry coated, the quality of magnesium oxide is 0.1wt% of the mass of cobalt-free positive electrode particles, and the mass ratio of graphite to magnesium oxide is 1:10;

[0058] (3) Heating the coated cobalt-free cathode particles at 350°C for 10 hours to obtain a cobalt-free cathode material, and then sifting the cobalt-free cathode material with a p...

Embodiment 2

[0060] This embodiment provides a method for preparing a cobalt-free positive electrode material, the preparation method comprising the following steps:

[0061] (1) Lithium carbonate, precursor Ni 0.6 mn 0.4 (OH) 2 and Nb 2 o 5 After mixing, put it in an air atmosphere, and sinter at 680°C for 13 hours to obtain a block material. The molar ratio of Li / (Ni+Mn) is 0.96 for mixing, and the D50 particle size of the precursor is 2.5 μm; The powdery material was crushed to obtain cobalt-free positive electrode particles with a particle size of 2.6 μm;

[0062] (2) Cobalt-free positive electrode particles, titanium oxide and polyethylene are mixed and then dry-coated, the mass of titanium oxide is 0.5wt% of the mass of cobalt-free positive electrode particles, and the mass ratio of polyethylene to titanium oxide is 1:200;

[0063] (3) Heating the coated cobalt-free cathode particles at 450°C for 9 hours to obtain a cobalt-free cathode material, followed by 120Hz airflow classif...

Embodiment 3

[0065] This embodiment provides a method for preparing a cobalt-free positive electrode material, the preparation method comprising the following steps:

[0066] (1) Lithium carbonate, precursor Ni 0.7 mn 0.3 (OH) 2 and ZrO 2 After mixing, put it in an oxygen atmosphere, and sinter at 760°C for 10 hours to obtain a block material. The molar ratio of Li / (Ni+Mn) is 0.97 for mixing, and the D50 particle size of the precursor is 3 μm; The material is crushed to obtain cobalt-free positive electrode particles with a particle size of 3.2 μm;

[0067] (2) Cobalt-free positive electrode particles, zirconia and polyvinylpyrrolidone are mixed and then dry-coated; the quality of zirconia is 1.2wt% of the mass of cobalt-free positive electrode particles, and the mass ratio of polyvinylpyrrolidone to zirconia is 1: 500;

[0068] (3) Heating the coated cobalt-free cathode particles at 550°C for 8 hours to obtain a cobalt-free cathode material, and then sifting through a 140Hz airflow c...

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Abstract

The invention provides a cobalt-free positive electrode material and a preparation method thereof. The cobalt-free positive electrode material comprises an inner core and a shell coating the inner core, the inner core is doped cobalt-free positive electrode particles, and the shell comprises a dopant; and the cobalt-free positive electrode material is subjected to infrared spectroscopic analysis, the peak area of a wave crest formed at the position of 520-620 cm<-1> is recorded as X, the peak area of a wave crest formed at the position of 800-900 cm<-1> is recorded as Y, and Y / X is larger than or equal to 0.010 and smaller than or equal to 0.035. Intercrystalline microcracks are reduced by optimizing doping, surface residual alkaline substances are reduced while the interface stability of the material is improved by coating, generation of gas is effectively inhibited, and the failure risk of the battery is further reduced.

Description

technical field [0001] The invention belongs to the technical field of cathode materials, and relates to a cobalt-free cathode material and a preparation method thereof. Background technique [0002] With the gradual development and popularization of new energy vehicles, people pay more attention to the related resources of lithium-ion batteries. Cobalt-free cathode materials are the most concerned in the world. Among them, nickel-manganese layered materials have become a research hotspot in recent years because of their advantages such as high energy density, low cost, and long cycle life. [0003] CN111422920A discloses a method for preparing a cobalt-free positive electrode material for a lithium ion battery, comprising: mixing lithium nickel manganese oxide with sulfate to obtain a first mixture, and the sulfate is a strong acid and weak alkali salt; react at a predetermined temperature so as to obtain the cobalt-free cathode material. [0004] CN112133903A discloses ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/36H01M4/485
CPCH01M4/0471H01M4/131H01M4/1391H01M4/366H01M4/485H01M2004/028Y02E60/10
Inventor 孙明珠江卫军
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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