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High-entropy single-crystal metal oxide with cation disordered rock salt structure and preparation method and application thereof

An oxide and cation technology, applied in chemical instruments and methods, inorganic chemistry, nickel compounds, etc., can solve the problems of poor cycle performance, large grain size, affecting material stability, etc., to achieve excellent cycle performance, high ratio The effect of capacity and energy density, promising commercial application prospects

Active Publication Date: 2021-11-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle performance of this material is poor
At the same time, the traditional method generally uses high-temperature solid-state reaction, and the synthesized grain size is large and easy to agglomerate, so subsequent grinding treatment is essential
However, the grinding process will inevitably introduce surface defects and distortions, making the crystal structure no longer complete and affecting the stability of the material.

Method used

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  • High-entropy single-crystal metal oxide with cation disordered rock salt structure and preparation method and application thereof
  • High-entropy single-crystal metal oxide with cation disordered rock salt structure and preparation method and application thereof
  • High-entropy single-crystal metal oxide with cation disordered rock salt structure and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] This embodiment provides a high-entropy single crystal metal oxide Li with a cationic disordered salt rock structure 1.25 mn 2+ 0.1 Fe 3 + 0.1 mn 3+ 0.1 Cr 3+ 0.1 Ti 4+ 0.1 Nb 5+ 0.25 o 2 and its preparation method, the preparation process of the preparation method is as follows figure 1 shown, including the following steps:

[0038] S1. Weigh Li according to the requirements of the stoichiometric ratio 2 O, MnO, Fe 2 o 3 , Mn 2 o 3 、Cr 2 o 3 、TiO 2 , Nb 2 o 5 , where Li 2 O excess of 5% to prevent loss during high temperature sintering;

[0039] S2. Mix the precursor uniformly by ball milling to obtain precursor powder. The ball-to-material ratio is 10:1, the ball milling time is 12 h, and the rotation speed is 500 r / min; the SEM image of the obtained precursor is as follows figure 2 shown;

[0040] S3. Weigh the precursor powder, add KCl molten salt with a molar ratio of 1:1 to the precursor and mix evenly; press the tablet under a pressure...

Embodiment 2

[0047] This embodiment provides a high-entropy single crystal metal oxide Li with a cationic disordered salt rock structure 1.25 Ni 2+ 0.1 Fe 3 + 0.1 mn 3+ 0.1 Cr 3+ 0.1 Ti 4+ 0.1 Nb 5+ 0.25 o2 And the preparation method thereof, the preparation method is the same as the steps and Example 1, but the raw materials and proportioning are different, specifically weighed according to the stoichiometric ratio of the target molecule. The metal oxide XRD collection of illustrative plates of the present embodiment sees Figure 5 , SEM picture as Figure 6 shown.

[0048] The Li obtained in this embodiment 1.25 Ni 2+ 0.1 Fe 3+ 0.1 mn 3+ 0.1 Cr 3+ 0.1 Ti 4+ 0.1 Nb 5+ 0.25 o 2 The material is used as the positive electrode active material of the lithium ion secondary battery, and is made into the positive electrode sheet and assembled into the lithium ion half battery. Using the constant current charge and discharge mode, the charge and discharge test was perf...

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Abstract

The invention provides a high-entropy single-crystal metal oxide with a cation disordered salt rock structure and a preparation method and application thereof. The preparation method of the metal oxide comprises the following steps of: mixing at least five transition metal compounds and lithium source powder, and carrying out ball milling to obtain a precursor; fully mixing the precursor with fused salt, tabletting, sintering at high temperature in an inert atmosphere, and rapidly cooling to obtain a product; and separating the product, washing the product with a solvent, and drying the product to obtain the high-entropy single-crystal metal oxide with a cation disordered rock salt structure. The transition metal compounds comprise at least one compound selected from Mo < 6 + >, V < 5 + >, Nb < 5 + > and Ti < 4 + >. The metal oxide obtained by the preparation method provided by the invention is a sphere-like single crystal, is of an Fm-3m type structure, is used as a secondary battery positive electrode material, and shows relatively high energy density and good cycling stability.

Description

technical field [0001] The present invention relates to the technical field of preparation of high-entropy metal oxides, and more specifically, to a high-entropy single-crystal metal oxide with cationic disordered salt rock structure and its preparation method and application. Background technique [0002] Since the 19th century, fossil energy such as coal, oil, and natural gas has supported the progress of human civilization and economic and social development. However, due to the non-renewability of fossil energy and the huge consumption of it by human beings, fossil energy is gradually becoming exhausted, and at the same time, it brings increasingly serious ecological and environmental problems. In such an era background, the development of renewable, sustainable and environmentally friendly new energy has become the consensus of mankind. Among them, lithium-ion batteries have been widely used in 3C products and electric vehicles due to their advantages such as high spec...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B1/10C01G49/00C01G53/00H01M4/505H01M4/525H01M4/485H01M10/0525
CPCC30B29/22C30B1/10C01G49/00C01G53/00H01M4/505H01M4/525H01M4/485H01M10/0525C01P2004/32C01P2004/61C01P2004/03C01P2002/72H01M2004/021H01M2004/028Y02E60/10
Inventor 纪效波梅雨侯红帅邹国强
Owner CENT SOUTH UNIV
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