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A kind of surface modified nickel base electrode material

An electrode material and surface modification technology, applied in battery electrodes, circuits, electrical components, etc., to achieve the effects of improving cycle performance and rate performance, excellent lithium ion conductivity, and improving Coulombic efficiency

Active Publication Date: 2022-06-24
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, nickel-rich ternary cathode material LiNi 1-x-y co x mn y o 2 However, there are still many problems to be solved urgently in terms of particle interface stability, cycle performance, and high current density discharge performance of the material.

Method used

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  • A kind of surface modified nickel base electrode material
  • A kind of surface modified nickel base electrode material
  • A kind of surface modified nickel base electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A surface-modified nickel-based electrode material includes a nickel-based material precursor, lithium acetate and yttria-stabilized bismuth oxide.

[0048] Further, the mass of the yttria-stabilized bismuth oxide accounts for 1% of the total electrode material.

[0049] Further, in the nickel-based material precursor, the material ratio of nickel, cobalt, and manganese is 85: 5:10, and in the surface-modified nickel-based electrode material, the ratio of lithium element, nickel element, cobalt element and manganese element is The molar ratio was 1.02:0.85:0.05:0.1.

[0050] The above materials were prepared into electrode materials for coating, and then made into button batteries for electrochemical performance testing. The obtained material has a specific capacity of 208mAh / g at 0.1C, and a capacity retention rate of 94% after 100 cycles at a rate of 1C. It is a positive electrode material for lithium batteries with excellent electrochemical performance.

[0051] Sp...

Embodiment 2

[0053] A surface-modified nickel-based electrode material includes a nickel-based material precursor, lithium acetate and dysprosium oxide-stabilized zirconia.

[0054] Further, the mass of the dysprosium oxide-stabilized zirconia accounts for 2% of the total electrode material.

[0055] Further, the mass ratio of nickel, cobalt and manganese in the nickel-based material precursor is 80:10:10, and the molar ratio of lithium element, nickel element, cobalt element and manganese element in the surface-modified nickel-based electrode material is 1.08:0.8:0.1:0.1.

[0056] The above materials were prepared into electrode materials for coating, and then made into button batteries for electrochemical performance testing. The obtained material has a specific capacity of 200mAh / g at 0.1C, and a capacity retention rate of 90% after 100 cycles at a rate of 1C, which is a positive electrode material for lithium batteries with excellent electrochemical performance.

[0057] Specifically...

Embodiment 3

[0059] A surface-modified nickel-based electrode material includes a nickel-based material precursor, lithium acetate and samarium oxide-stabilized tin oxide.

[0060] Further, the mass of the samarium oxide-stabilized tin oxide accounts for 1% of the total electrode material.

[0061] Further, the mass ratio of nickel, cobalt, and manganese in the nickel-based material precursor is 90:5:5, and the molar ratio of lithium, nickel, cobalt, and manganese in the surface-modified nickel-based electrode material is is 1.06:0.9:0.05:0.05.

[0062] The above materials were prepared into electrode materials for coating, and then made into button batteries for electrochemical performance testing. The obtained material has a specific capacity of 218mAh / g at 0.1C, and a capacity retention rate of 92% after 100 cycles at a rate of 1C. It is a positive electrode material for lithium batteries with excellent electrochemical performance.

[0063] Specifically, with Figure 13 This is the s...

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Abstract

The invention discloses a surface-modified nickel-based electrode material, which comprises a nickel-based material precursor, lithium acetate and a modification substance, wherein the modification substance is an oxygen ion conductor material; the oxygen ion conductor material is yttrium oxide stabilized bismuth oxide, Any one of dysprosium oxide stabilized zirconia or samarium oxide stabilized tin oxide or a combination of the two; the quality of the oxygen ion conductor material accounts for 0.01-5% of the total electrode material; nickel, The mass ratio of cobalt and manganese is 0.6~0.9:0.05~0.2:0.05~0.2. In the present invention, the nickel-based electrode material can suppress Li after being modified by the oxygen ion conductor + / Ni 2+ The disorder of the material improves the initial Coulombic efficiency of the material, and at the same time, the synergistic effect of the vacancies of lithium and nickel in the delithiation process aggravates the instability of oxygen, while the oxygen ion conductor just provides oxygen ions in the process of modifying nickel-based materials. vacancies, thereby improving the structural stability of the material.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a surface-modified nickel-based electrode material. Background technique [0002] With the rapid development of the new energy vehicle industry, higher requirements have been placed on the cruising range and safety performance of electric vehicles. Traditional lithium-ion battery cathode materials cannot meet the demand due to their own limitations. Nickel-rich ternary cathode material LiNi 1-x-y Co x Mn y O 2 Combining the advantages of Ni-Co-Mn three elements, the synergistic effect, in which Ni element can effectively increase the specific capacity of the material, with the increase of Ni content, the energy density of the material increases; Mn element reduces the material cost and improves the battery. The safety and stability of the material; while the Co element has excellent electrochemical activity, which can improve the electronic conductivity of the ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 何蕊刘振法张利辉白薛魏爱佳
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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