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Metal-doped modified ternary positive electrode material and preparation method thereof

A positive electrode material and metal technology, which is applied in the field of metal-doped and modified ternary positive electrode materials and its preparation, can solve the problems of reducing material capacity, hindering ion migration, and improving battery polarization, and achieves simple preparation methods and high cycle times. Stability, the effect of inhibiting structural phase transition

Pending Publication Date: 2022-03-22
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, an overly thick coating layer will hinder the migration of ions, and some coating layers themselves have electronic / ion insulation, which may increase the polarization of the battery and even reduce the capacity of the material

Method used

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  • Metal-doped modified ternary positive electrode material and preparation method thereof
  • Metal-doped modified ternary positive electrode material and preparation method thereof
  • Metal-doped modified ternary positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 (this embodiment doping magnesium ion)

[0038] A kind of ternary cathode material, its chemical formula is LiNi 0.6 co 0.17 mn 0.2 Mg 0.03 o 2 .

[0039] The preparation method of the ternary cathode material comprises the following steps:

[0040] Mix deionized water and ethylene glycol according to a volume ratio of 1:1.2, and stir to obtain a solvent;

[0041] NiSO 4 ·6H 2 O. CoSO 4 ·6H 2 O, MnSO 4 ·H 2 O, MgSO 4 ·6H 2 O is weighed according to the molar ratio of 0.6:0.17:0.2:0.03, and a certain amount of urea is weighed at the same time, wherein MgSO 4 ·6H 2 The mass ratio of O to urea is 1:2, and the above-mentioned weighed raw materials are added to the solvent, and ultrasonically stirred at 40KHz for 30min to obtain a mixed solution with a concentration of 0.02g / mL;

[0042] Transfer the mixed solution to a reaction kettle for heat treatment, the heating temperature is 180°C, and the heating time is 12h;

[0043] After the reaction ...

Embodiment 2

[0047] Embodiment 2 (this embodiment is doped with aluminum ions)

[0048] A kind of ternary cathode material, its chemical formula is LiNi 0.6 co 0.17 mn 0.2 Al 0.03 o 2 .

[0049] The preparation method of the ternary cathode material comprises the following steps:

[0050] Mix deionized water and ethylene glycol according to a volume ratio of 1:1.5, and stir to obtain a solvent;

[0051] NiSO 4 ·6H 2 O. CoSO 4 ·6H 2 O, MnSO 4 ·H 2 O, Al 2 (SO 4 ) 3 18H 2 O is weighed according to the molar ratio of 0.6:0.17:0.2:0.015, and a certain amount of urea is weighed simultaneously, wherein Al 2 (SO 4 ) 3 18H 2 The mass ratio of O to urea is 1:2, and the above-mentioned weighed raw materials are added to the solvent, and ultrasonically stirred at 60KHz for 10min to obtain a mixed solution with a concentration of 0.05g / mL;

[0052] Transfer the mixed solution to the reactor for heat treatment, the heating temperature is 150°C, and the heating time is 15h;

[0053]...

Embodiment 3

[0057] Embodiment 3 (this embodiment is doped with magnesium-aluminum ions)

[0058] A kind of ternary cathode material, its chemical formula is LiNi 0.6 co 0.17 mn 0.2 Mg 0.015 Al 0.015 o 2 .

[0059] The preparation method of the ternary cathode material comprises the following steps:

[0060] Mix deionized water and ethylene glycol according to a volume ratio of 1:1.2, and stir to obtain a solvent;

[0061] NiSO 4 ·6H 2 O. CoSO 4 ·6H 2 O, MnSO 4 ·H 2 O, MgSO 4 ·6H 2 O, Al 2 (SO 4 ) 3 18H 2 O is weighed according to the molar ratio of 0.6:0.17:0.2:0.015:0.0075, and a certain amount of urea is weighed at the same time, wherein MgSO 4 ·6H 2 O and Al 2 (SO 4 ) 3 18H 2 The mass ratio of O to urea is 1:2, the above-mentioned weighed raw materials are added to the solvent, and stirred ultrasonically at 50KHz for 20min to obtain a mixed solution with a concentration of 0.02g / mL;

[0062] Transfer the mixed solution to a reaction kettle for heat treatment, t...

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Abstract

The invention belongs to the technical field of batteries, and discloses a metal-doped modified ternary positive electrode material and a preparation method thereof. The chemical formula of the ternary positive electrode material is LiNi < 0.6 > Co < 2-x > Mn < 0.2 > M < x > O < 2 >, x is more than 0 and less than 0.1, and M is at least one of Al and Mg. According to the metal-doped modified ternary positive electrode material provided by the invention, by doping the aluminum ions and / or magnesium ions, the structure phase change can be inhibited, the lithium-nickel mixed arrangement can be reduced, the thermal stability of the material can be improved, the cycle life can be prolonged, and the rate capability can be improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a metal-doped modified ternary positive electrode material and a preparation method thereof. Background technique [0002] In recent years, ternary cathode materials have been widely used in various fields of human production and life, such as mobile phones, notebook computers, cameras and other small electronic devices, and have appeared in large devices such as new energy vehicles. In lithium-ion batteries, the performance of the cathode material affects the performance of the entire battery. For the currently commercialized positive electrode materials, such as lithium cobaltate, lithium nickelate, lithium manganate, etc., there are some restrictive shortcomings, resulting in poor performance of lithium-ion batteries, while ternary positive electrode materials have both the above advantages. The advantages of this material, the comprehensive performance is excel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/50H01M4/525H01M4/505H01M10/0525H01M2004/028C01P2002/72C01P2004/03C01P2006/40
Inventor 段连峰党荣鑫渠源多鲁福身王俊凯
Owner SHANTOU UNIV
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