Method for modifying positive electrode material by using nitrogen-containing compound, and application of positive electrode material in lithium ion battery

A positive electrode material and nitrogen compound technology, applied in the field of secondary battery positive electrode materials, can solve the problems of low rate performance and poor cycle life of the positive electrode material transition metal oxide, and achieve low modification cost, improved kinetics, and a simple and mild synthesis method. Effect

Inactive Publication Date: 2021-07-16
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned defects existing in the prior art, the object of the present invention is to provide a method for modifying positive electrode materials by nitrogen-containing compounds and its application in lithium-ion batteries, so as to solve the problem of increasing the ratio of positive electrode materials, especially lithium-rich layered transition metal oxides. Practical problems such as low performance and poor cycle life

Method used

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  • Method for modifying positive electrode material by using nitrogen-containing compound, and application of positive electrode material in lithium ion battery
  • Method for modifying positive electrode material by using nitrogen-containing compound, and application of positive electrode material in lithium ion battery
  • Method for modifying positive electrode material by using nitrogen-containing compound, and application of positive electrode material in lithium ion battery

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Effect test

Embodiment 1

[0032] 10g of Li 1.25 mn 0.625 Ni 0.125 o 2 The positive electrode material powder was added to 100 mL of 1 mol / L aqueous urea solution, and stirred magnetically at 90°C for 5 hours until dry.

[0033] Will Li 1.25 mn 0.625 Ni 0.125 o 2 The mixture with urea was heated in a nitrogen atmosphere muffle furnace at 400°C for two hours. Such as figure 1 As shown, the urea treatment did not change the phase of the material body, and there was no obvious difference in the crystal diffraction peaks before and after treatment. Such as figure 2 As shown, it can be seen that the photoelectron spectrum peak of N appears on the surface of the material, and the high-resolution photoelectron spectroscopy analysis shows that the characteristic peak of carbonitride appears on the surface of the material, and the manganese ion is partially reduced, accompanied by oxygen vacancies and Li 2 CO 3 The appearance of characteristic peaks confirmed the occurrence of urea modification. Suc...

Embodiment 2

[0036] 10g of ternary cathode material LiNi 0.6 mn 0.2 co 0.2 o 2 The powder was ball milled with 2 g of melamine at 300 rpm for 6 hours to obtain a mixture powder, and the mixture powder was heated in an air atmosphere muffle furnace at 500° C. for 5 hours. The modified ternary cathode material is obtained. Such as Figure 4 As shown, the crystal structure of the ternary material did not change after modification. The electrochemical stability of the modified material also showed a certain improvement.

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Abstract

The invention discloses a method for modifying a positive electrode material by using a nitrogen-containing compound, and application of the positive electrode material in a lithium ion battery. The method comprises the following steps: firstly, uniformly mixing a lithium-rich positive electrode material and urea in proportion by a dry method or a wet method; and heating the mixture of the positive electrode material and urea to a certain temperature to thermally decompose the urea so as to finish the modification of the positive electrode material. The practical problems of low rate capability, short cycle life and the like of the positive electrode material, especially the lithium-rich layered transition metal oxide are solved.

Description

technical field [0001] The invention relates to the field of secondary battery cathode materials, more specifically, to a method for modifying cathode materials by nitrogen-containing compounds and its application in lithium-ion batteries. Background technique [0002] Secondary batteries, especially lithium-ion batteries, have the advantages of high energy density, long cycle life, and good safety performance. Since their introduction in the 1990s, they have been widely used in various portable electronic devices and electric vehicles. Whether it is an electric vehicle or an energy storage system, an important requirement is that the battery can provide greater power, charge faster and have excellent cycle stability. The realization of these requirements requires breakthroughs in battery materials. [0003] Cathode material is a key component of lithium-ion batteries, which directly determines the capacity density, rate performance and cycle life of metal-ion batteries. At...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 朱晓波徐丽敏吴若飞李铮铮杨兵王连洲陶军
Owner BAOSHAN IRON & STEEL CO LTD
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