Dicationic co-doped high-nickel ternary layered positive electrode material as well as preparation method and application thereof

A ternary layered, dicationic technology, applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problems of poor rate performance, capacity and voltage, and achieve the effect of improving rate performance, simple method, and promoting diffusion transmission

Inactive Publication Date: 2022-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Based on this, one of the objectives of the present invention is to provide a double cation-doped high-nickel ternary positive electrode material, which can not only improve the intrinsic conductivity, improve the kinetic performance of lithium ion diffusion and transport, but also It can suppress the generation of microcracks during the cycle, alleviate its capacity decay and voltage drop during the cycle, and effectively overcome the problems of poor rate performance and serious capacity and voltage decay during the cycle of existing high-nickel ternary cathode materials.

Method used

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  • Dicationic co-doped high-nickel ternary layered positive electrode material as well as preparation method and application thereof
  • Dicationic co-doped high-nickel ternary layered positive electrode material as well as preparation method and application thereof
  • Dicationic co-doped high-nickel ternary layered positive electrode material as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0040] This embodiment provides a double cation co-doped high-nickel ternary layered positive electrode material, the preparation method of which comprises the following steps:

[0041] S1. Weigh 0.02 mol precursor Ni 0.85 co 0.10 mn 0.05 (OH) 2 , 0.0001 mol dopant SrZrO 3 , 0.021mol lithium source LiOH·H 2 O is placed in an agate ball mill jar to obtain a raw material mixture, in which LiOH·H 2 O excess of 5% mol to prevent evaporation loss during high-temperature sintering; then add solvent isopropanol, wherein the mass ratio of isopropanol to raw material mixture is 10:1;

[0042] S2. Put the ball mill tank loaded with the raw material mixture in S1 in a ball mill, mill at a speed of 500 rpm / min for 12 h, and then vacuum dry at 80° C. for 12 h to obtain a uniformly mixed raw material powder;

[0043] S3. Transfer the raw material powder in S2 to the corundum ark, and then place it in an oxygen atmosphere, firstly raise the temperature to 500°C at a rate of 3°C / min, th...

Embodiment 2

[0045] This embodiment provides a double cation co-doped high-nickel ternary positive electrode material, and its preparation method specifically includes the following steps:

[0046] S1. Weigh 0.02 mol precursor Ni 0.85 co 0.10 mn 0.05 (OH) 2 , 0.0001 mol dopant SrTiO 3 , 0.021mol lithium source LiOH·H 2 O is placed in an agate ball mill jar to obtain a raw material mixture, in which LiOH·H 2 O excess of 5% mol to prevent evaporation loss during high-temperature sintering; then add solvent isopropanol, wherein the mass ratio of isopropanol to raw material mixture is 10:1;

[0047] S2. Put the ball mill tank loaded with the raw material mixture in S1 in a ball mill, mill at a speed of 700 rpm / min for 10 h, and then vacuum dry at 80° C. for 12 h to obtain a uniformly mixed raw material powder;

[0048] S3. Transfer the raw material powder in S2 to the corundum ark, and then place it in an oxygen atmosphere, first raise the temperature to 480 °C at a rate of 5 °C / min, kee...

Embodiment 3

[0050] This embodiment provides a double cation co-doped high-nickel ternary layered positive electrode material, and its preparation method specifically includes the following steps:

[0051] S1. Weigh 0.02 mol precursor Ni 0.85 co 0.10 mn 0.05 (OH) 2 , 0.0001 mol dopant BaTiO 3 , 0.021mol lithium source LiOH·H 2 O is placed in an agate ball mill jar to obtain a raw material mixture, in which LiOH·H 2 O excess of 5% mol to prevent evaporation loss during high-temperature sintering; then add solvent isopropanol, wherein the mass ratio of isopropanol to raw material mixture is 10:1;

[0052] S2. Put the ball mill tank loaded with the raw material mixture in S1 in a ball mill, mill at a speed of 300 rpm / min for 15 hours, and then vacuum dry at 80°C for 12 hours to obtain a uniformly mixed raw material powder;

[0053] S3. Transfer the raw material powder in S2 to the corundum ark, and then place it in an oxygen atmosphere, first raise the temperature to 600 °C at a rate of...

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Abstract

The invention provides a dication co-doped high-nickel ternary positive electrode material and a preparation method thereof. The molecular formula of the positive electrode material is LiNi < x > Co < y > Mn < z > MaQ O < 2 >, wherein M is at least one of Sr, Ca, Sn, Ba and Y with large ion radius; q is at least one of Zr, Ti and Ru with strong binding energy with oxygen; wherein 0.5 < = x < 1, 0 < z < = y < x, 0.001 < = a < = 0.05, 0.001 < = b < = 0.05, and x + y + z + a + b = 1. According to the invention, M and Q are added into the high-nickel ternary material, so that the problems of poor rate capability, serious attenuation of capacity and voltage in the circulation process and the like of the existing high-nickel ternary positive electrode material can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, and more specifically, relates to a double-cation co-doped high-nickel ternary layered positive electrode material and a preparation method and application thereof. Background technique [0002] Fossil energy is the fundamental guarantee for human survival and the development of society, the country, and science and technology. Therefore, energy issues have become a common problem faced by the world. [0003] Since the second industrial revolution in the 1870s, the consumption of fossil fuels has grown rapidly, and most of the energy required for global economic activities comes from fossil energy, resulting in a large amount of waste of resources and energy exhaustion. At the same time, the overexploitation of fossil fuels has also led to serious deterioration of the natural environment, causing a series of environmental problems that threaten the safety of human life, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/628H01M4/626H01M4/505H01M4/525H01M4/131H01M10/0525H01M2004/028H01M2004/021
Inventor 纪效波倪炼山侯红帅邹国强
Owner CENT SOUTH UNIV
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