Preparation method and application of layered high-entropy oxide sodium ion battery positive electrode material

A sodium-ion battery and cathode material technology, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of high charge transfer resistance, low ionic and electronic conductivity, low rate performance, etc., and achieves low equipment requirements. The effect of good crystallinity and good sodium storage performance

Active Publication Date: 2021-03-09
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned materials, as cathode materials for sodium-ion batteries, still have the defects of low ion and electronic conductivity, high charge transfer resistance, and low rate performance.

Method used

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  • Preparation method and application of layered high-entropy oxide sodium ion battery positive electrode material
  • Preparation method and application of layered high-entropy oxide sodium ion battery positive electrode material
  • Preparation method and application of layered high-entropy oxide sodium ion battery positive electrode material

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Embodiment 1

[0039] A preparation method of a layered high-entropy oxide sodium ion battery positive electrode material, comprising the following steps:

[0040] Step 1: Take Fe with a purity of 99% 2 o 3 (0.1mol, 0.484g), Co 3 o 4 (0.067mol, 0.489g), NiO (0.2mol, 0.453g), TiO 2 (0.2mol, 0.484g) and SnO with a purity of 99.5% 2 (0.2mol, 0.909g) powder was mixed uniformly to obtain material A;

[0041] Step 2: Mix material A with Na 2 CO 3 According to the molar ratio of 1:1.02, put the ingredients into the polyurethane ball milling tank, and add an appropriate amount of zirconia balls (the mass ratio of balls and materials is 10:1) and absolute ethanol dispersant; then place the polyurethane ball milling tank on the planetary On the station of a type ball mill, ball mill continuously at a speed of 300r / min for 3 hours to obtain a fully mixed slurry; then put it in an oven, dry it at a constant temperature at 50°C, and grind it to powder to make a precursor C;

[0042] Step 3: Put ...

Embodiment 2

[0047] A preparation method of a layered high-entropy oxide sodium ion battery positive electrode material, comprising the following steps:

[0048] Step 1: Take Fe with a purity of 99% 2 o 3 (0.09mol, 0.436g), Co 3 o 4 (0.060mol, 0.438g), NiO (0.18mol, 0.407g), TiO 2 (0.18mol, 0.436g) and SnO with a purity of 99.5% 2 (0.18mol, 0.818g) powder was mixed uniformly to obtain material A;

[0049] Step 2: Mix material A with Li with a purity of 99.66% 2 CO 3 (0.05mol, 0.114g, excess 2%mol) mixed uniformly to make material B;

[0050] Step 3: Combine material B with Na 2 CO 3 According to the molar ratio of 1:1.02, put the ingredients into the polyurethane ball mill tank, and add an appropriate amount of zirconia balls (the mass ratio of the ball to the material is 10:1) and anhydrous ethanol dispersant; then place the polyurethane ball mill tank on the planetary ball mill On the station, continuously ball mill at a speed of 300r / min for 3 hours to obtain a fully mixed slu...

Embodiment 3

[0056] A preparation method of a layered high-entropy oxide sodium ion battery positive electrode material, comprising the following steps:

[0057] Step 1: Take Fe with a purity of 99% 2 o 3 (0.083mol, 0.402g), Co 3 o 4 (0.056mol, 0.409g), NiO (0.167mol, 0.378g), TiO 2 (0.167mol, 0.404g) and SnO with a purity of 99.5% 2 (0.167mol, 0.759g) obtained material A after powder mixing;

[0058] Step 2: Mix material A with Li with a purity of 99.66% 2 CO 3 (0.083mol, 0.189g, excess 2%mol) mixed to make material B;

[0059] Step 3: Combine material B with Na 2 CO 3 According to the molar ratio of 1:1.02, put the ingredients into the polyurethane ball mill tank, and add an appropriate amount of zirconia balls (the mass ratio of the ball to the material is 10:1) and anhydrous ethanol dispersant; then place the polyurethane ball mill tank on the planetary ball mill On the station, continuously ball mill at a speed of 300r / min for 3 hours to obtain a fully mixed slurry; then put...

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Abstract

The invention discloses a preparation method and application of a layered high-entropy oxide sodium ion battery positive electrode material and belongs to the field of sodium ion battery positive electrode materials. The material is a Na (Fe(1-x) / 5Co(1-x) / 5Ni(1-x) / 5Sn(1-x) / 5Ti(1-x) / 5)LixO2 high-entropy oxide sodium ion battery positive electrode material, and x is equal to 0 or 0.1 or 1 / 6. The material prepared by the invention has the structural advantages of single phase, good crystallinity, small particle size, uniform distribution and the like, and by doping alkali metal elements, ionic and electronic conductivity of the material is effectively improved, the charge transfer impedance is greatly reduced, and the rate capability is improved. Under the current density of 10mA / g, the firstreversible specific capacity of the material is 80-120mAh / g; under the current density of 50 mA / g, the specific capacity reaches 40-100 mAh / g after 200 cycles, and the capacity retention ratio is larger than or equal to 58%.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for sodium ion batteries, in particular to a preparation method and application of a layered high-entropy oxide sodium ion battery positive electrode material. Background technique [0002] High-entropy oxides (HEO) were first proposed by American scientists Jon-Paul Maria and Stefano Curtarolo in 2015. It usually consists of five or more elements in an equiatomic ratio or close to an equiatomic ratio. Elements form a united lattice by sharing the same atomic sites, and are arranged disorderly in the crystal. This disordered distribution and the interaction between different metal ions give it a large mixing entropy, which effectively inhibits the formation of intermetallic compounds or complex phases, and thus tends to generate a single-phase solid solution structure. Based on the thermodynamic high-entropy effect, kinetic hysteresis diffusion effect, structural lattice distortion eff...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/054
CPCH01M4/485H01M4/505H01M4/525H01M4/366H01M10/054H01M2004/028Y02E60/10
Inventor 王志远田康辉刘延国王丹孙宏宇
Owner 东北大学秦皇岛分校
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