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Lithium-rich positive electrode material based on surface modification of MOFs and preparation method thereof

A technology of lithium-rich cathode material and lithium-rich material, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as low electronic conductivity spinel coating, HF corrosion, etc., to improve rate performance, inhibit Corrosion, the effect of improving cycle performance

Active Publication Date: 2018-07-27
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium-rich positive electrode material based on MOFs surface modification to solve the problem of low electronic conductivity and single spinel coating in the prior art. layer is susceptible to corrosion by HF generated by electrolyte decomposition

Method used

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  • Lithium-rich positive electrode material based on surface modification of MOFs and preparation method thereof
  • Lithium-rich positive electrode material based on surface modification of MOFs and preparation method thereof
  • Lithium-rich positive electrode material based on surface modification of MOFs and preparation method thereof

Examples

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Embodiment 1

[0039] Surface modification of MOFs applied to lithium-rich manganese-based cathode materials Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , prepared by the following steps:

[0040] (1) Mix N,N-dimethylformamide, absolute ethanol and deionized water at a volume ratio of 15:1:1, add 0.3g of aluminum nitrate and 0.17g of 1,3,5-benzenetricarboxylic acid to obtain mixture;

[0041] (2) Add 2 g of the lithium-rich positive electrode material to the mixed solution prepared in step (1), put it into a vacuum stirring reactor, and react at 80° C. for 2 h;

[0042] (3) The suspension obtained by the reaction is centrifuged and washed three times, and dried under vacuum to obtain a lithium-rich positive electrode material coated with MOFs;

[0043] (4) The MOFs-coated lithium-rich cathode material obtained in step (3) was placed in N 2 Sintering at 550 °C for 2 h under atmosphere to obtain MOFs-modified lithium-rich cathode materials.

[0044] By XRD pattern ( figure 1 ) shows that the l...

Embodiment 2

[0049] Surface modification of MOFs applied to lithium-rich manganese materials Li 1.2 mn 0.6 Ni 0.2 o 2 , prepared by the following steps:

[0050] (1) Mix N,N-dimethylformamide, absolute ethanol and deionized water in a volume ratio of 13:2:2, add 0.12 manganese chloride and 0.13 g of 1,3,5-benzenetricarboxylic acid to obtain a mixed solution;

[0051] (2) Add 2 g of the lithium-rich positive electrode material to the mixed solution prepared in step (1), put it in a vacuum stirred reactor, and react at 120° C. for 1 h;

[0052] (3) The suspension obtained by the reaction is centrifuged and washed three times, and dried under vacuum to obtain a lithium-rich positive electrode material coated with MOFs;

[0053] (4) The MOFs-coated lithium-rich cathode material obtained in step (3) was placed in N 2 Sintering at 450 °C for 3 h under atmosphere to obtain MOFs-modified lithium-rich cathode materials.

Embodiment 3

[0055] Surface modification of MOFs applied to lithium-rich manganese materials Li 1.2 mn 0.6 Ni 0.2 o 2 , prepared by the following steps:

[0056] (1) Mix N,N-dimethylformamide, absolute ethanol and deionized water at 11:4:4, add 0.04g ferric chloride, 0.046g manganese chloride and 0.1g of 1,3,5 -benzenetricarboxylic acid obtains mixed solution;

[0057] (2) Add 2 g of the lithium-rich positive electrode material to the mixed solution prepared in step (1), put it into a vacuum stirred reactor, and react at 150° C. for 0.5 h;

[0058] (3) The suspension obtained by the reaction is centrifuged and washed three times, and dried under vacuum to obtain a lithium-rich positive electrode material coated with MOFs;

[0059] (4) The MOFs-coated lithium-rich cathode material obtained in step (3) was placed in N 2 Sintering at 600 °C for 2 h under atmosphere to obtain MOFs-modified lithium-rich cathode materials.

[0060] In summary, the present invention can stably prepare spin...

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Abstract

The invention discloses a lithium-rich positive electrode material based on surface modification of MOFs and a preparation method thereof, belonging to the technical field of positive electrode materials for lithium ion batteries. According to the invention, a MOFs coating layer is prepared on the surface of a lithium-rich material; metal elements in the MOFs form metal oxides during sintering; acomplex is carbonized on the surfaces of metal oxide particles; reducing effect is exerted on the surface of the lithium-rich material is in the process of carbonization, which induces the formation of a spinel structure on the surface of the lithium-rich material, so the lithium-rich positive electrode material is finally formed; and the lithium-rich positive electrode material comprises a lithium-rich material nuclear body and a spinel structure coating layer formed on the surface of the lithium-rich material nuclear body in situ, and the outer surface of the spinel coating layer is coated with a composite layer containing the metal oxides and carbon. The preparation method of the invention is simple and easily controllable, and the electrochemical performance of the lithium-rich positive electrode material can be significantly improved based on the surface modification of the MOFs.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a lithium-rich positive electrode material based on MOFs surface modification and a preparation method thereof. Background technique [0002] In today's world, there is an increasing demand for sustainable energy storage and replacement devices. As a clean energy storage device, lithium-ion batteries are currently widely used in portable devices, electric vehicles, and smart grids. However, the limited energy density of cathode materials severely restricts the further development of lithium-ion batteries. Therefore, the development of high-performance cathode materials has become the key to the development of lithium-ion batteries. [0003] Among many cathode materials for lithium-ion batteries, the lithium-rich material xLi 2 MnO 3 ·(1-x)LiMn y Ni z co 1-y-z o 2 , where 0<x<1, 0≦y≦1, 0≦z≦1, 0<y+z≦1, due to its high d...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王永刚史凌波向德波皮智超
Owner TIANNENG SAFT ENERGY JOINT CO
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