Surface modification method for improving electrochemical performance of lithium-rich material, obtained lithium-rich material and application thereof

A lithium-rich material and surface modification technology, which is applied in the field of new energy electrode materials, can solve problems such as destroying the material structure, and achieve the effect of excellent electrochemical performance of the material, simple method, and large output

Active Publication Date: 2017-12-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is applied to lithium-rich materials, high-valence transition metal ions will be reduced in the high-temperature carbonization stage, thereby destroying the structure of the material.

Method used

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  • Surface modification method for improving electrochemical performance of lithium-rich material, obtained lithium-rich material and application thereof
  • Surface modification method for improving electrochemical performance of lithium-rich material, obtained lithium-rich material and application thereof
  • Surface modification method for improving electrochemical performance of lithium-rich material, obtained lithium-rich material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Mix 0.5g lithium-rich material powder with 0.5g 2-methylimidazole.

[0032] 2) Put the above mixture under vacuum condition, heat it to 150°C, keep it warm for 8h, cool it naturally to room temperature and take it out.

[0033] 3) put the product obtained in the previous step in the tube furnace N 2 Or in an Ar atmosphere at 450°C for 2h, with a heating rate of 5°C / min, and take it out after natural cooling to room temperature, to obtain a carbon & nickel-cobalt alloy quantum dot heterostructure-coated lithium-rich material.

[0034] Taking the carbon & nickel-cobalt alloy quantum dot heterostructure-coated lithium-rich material produced in this example as an example, its structure was confirmed by X-ray diffractometer and scanning electron microscope. Such as figure 1 As shown in (a), the X-ray diffraction pattern (XRD) shows that the product is α-NaFeO 2 Structure, O3-type layered compound, without any heterogeneous phase. Scanning electron microscope (SEM) ima...

Embodiment 2

[0045] 1) Mix 0.5g of lithium-rich material powder with 1g of 2-methylimidazole.

[0046] 2) Put the above mixture under vacuum condition, heat it to 160°C, keep it warm for 8h, cool it down to room temperature naturally, and take it out.

[0047] 3) put the product obtained in the previous step in the tube furnace N 2 Or in an Ar atmosphere at 450°C for 2h, with a heating rate of 4°C / min, take it out after natural cooling to room temperature, and you can get a carbon & nickel-cobalt alloy quantum dot heterostructure-coated lithium-rich material.

[0048] When the lithium-rich material modified by this method is used as the positive electrode material of lithium ion battery, after 100 cycles at a current density of 0.4C, it still has 210mAh g -1 The reversible specific capacity, the capacity retention rate can reach 78%; cycle at a current density of 2C, after 300 cycles, the reversible specific capacity reaches 112.6mAh g -1 , the capacity retention rate can reach 85%, and ...

Embodiment 3

[0050] 1) Mix 0.5g lithium-rich material powder with 0.5g methylimidazole.

[0051] 2) Put the above mixture under vacuum condition, heat it to 180°C, keep it warm for 4h, cool it down to room temperature naturally, and take it out.

[0052] 3) put the product obtained in the previous step in the tube furnace N 2 Or in an Ar atmosphere at 480°C for 3 hours, with a heating rate of 3°C / min, and then take it out after natural cooling to room temperature, to obtain a carbon & nickel-cobalt alloy quantum dot heterostructure-coated lithium-rich material.

[0053] When the lithium-rich material modified by this method is used as the positive electrode material of lithium ion battery, after 100 cycles at a current density of 0.4C, it still has 200mAh g -1 The reversible specific capacity, the capacity retention rate can reach 76%; cycled at a current density of 2C, after 300 cycles, the reversible specific capacity can reach 110mAh g -1 , the capacity retention rate can reach 85%, a...

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Abstract

The invention relates to a surface modification method for improving electrochemical performance of a lithium-rich material based on driving by a metal organic framework material. The obtained material can be taken as a lithium ion battery cathode material, and has great popularization universality. The method comprises the following steps: 1) a proper amount of the lithium-rich material and a proper amount of organic ligand are mixed; 2) an above mixture is placed under vacuum condition for a heating reaction; and 3) the product obtained in the step 2) is subjected to heat treatment under inert atmosphere to obtain the modified lithium-rich material. The method has the beneficial effects that an metal organic framework material-driven carbon-coated surface modification method is used for optimizing the lithium-rich material, and the lithium-rich material has excellent cycle performance and multiplying power performance as the lithium ion battery cathode material.

Description

technical field [0001] The invention belongs to the field of new energy electrode materials, and specifically relates to a surface modification method for improving the electrochemical performance of lithium-rich materials driven by metal-organic framework materials. fitness. Background technique [0002] With the rapid development of portable electronic devices, electric vehicles and hybrid vehicles, lithium-ion batteries are required to have high energy density, high power density, low cost and long cycle life. In commercial lithium-ion batteries, graphite, a traditional negative electrode material, has a capacity of 372mAh g -1 The specific capacity, while the positive electrode material lithium cobalt oxide is only 150mAh g -1 specific capacity. Cathode materials have become a bottleneck in the development of lithium-ion batteries. Therefore, it is of great significance to develop cathode materials for lithium-ion batteries with high theoretical specific capacity. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/04H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/0471H01M4/366H01M4/62H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 韩春华肖治桐麦立强孟甲申
Owner WUHAN UNIV OF TECH
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