High-nickel sodium ion positive electrode material, preparation method thereof and battery

A cathode material, sodium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as limiting the potential application of sodium ion cathode materials, increasing the interface impedance between the material and the electrolyte, and reducing the rate of sodium ion diffusion. , to improve the electrochemical performance, good cycle stability, and enhance the effect of Na+ transfer

Pending Publication Date: 2022-04-26
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, currently available high-nickel sodium-ion batteries have obvious disadvantages. For example, the mixing effect of cations such as high-nickel and low-manganese-cobalt reduces the diffusion rate of sodium ions, resulting in poor performance during discharge; , the high-nickel-sodium-ion positive electrode material in the battery reacts quickly to the external environment in contact with it, and is easy to react with H in the environment. 2 O.CO 2 Wait for the reaction to generate Na 2 CO 3 and NaOH, and dehydration of NaOH to form Na 2 O, Na 2 CO 3 , NaOH, Na 2 O will form a passivation layer on the surface of the positive electrode, further hinder the diffusion of sodium ions at the interface between the material and the electrolyte, increase the impedance between the interface between the material and the electrolyte, and easily cause the electrochemical performance of the battery to decline
Therefore, this greatly limits the potential application of sodium ion cathode materials

Method used

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  • High-nickel sodium ion positive electrode material, preparation method thereof and battery
  • High-nickel sodium ion positive electrode material, preparation method thereof and battery
  • High-nickel sodium ion positive electrode material, preparation method thereof and battery

Examples

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Embodiment 1

[0042] A kind of high nickel sodium ion cathode material, its chemical formula is NaNi 0.8 C o0.1 mn 0.1 o 2 ·0.059CNP-Al / 0.03NH 4 VO 3 .

[0043] The preparation method of the above-mentioned high-nickel sodium ion positive electrode material comprises the following steps:

[0044] (1) Preparation of nickel-cobalt-manganese materials: the ternary positive electrode material recovered from waste ternary lithium batteries is subjected to acid leaching, aluminum removal, copper removal, and extraction to obtain nickel-cobalt-manganese sulfate mixed salt solution, and nickel-cobalt-manganese sulfate mixed salt solution is determined Medium nickel-cobalt-manganese molar ratio (0.965:0.12:0.11), take 500mL in a beaker, add 0.011M nickel sulfate, 0.002M cobalt sulfate, 0.012M manganese sulfate to the nickel sulfate mixed salt solution, add 40ml Base cellulose, stir well, keep the temperature at 45°C, add sodium carbonate, stir until complete precipitation, and let it stand for...

Embodiment 2

[0057] A kind of high nickel sodium ion cathode material, its chemical formula is NaNi 0.74 co 0.16 mn 0.1 o 2 ·0.045CNP-Al / 0.02NH 4 VO 3 .

[0058] The preparation method of the above-mentioned high-nickel sodium ion positive electrode material comprises the following steps:

[0059] (1) Preparation of nickel-cobalt-manganese materials: the ternary positive electrode material recovered from waste ternary lithium batteries is subjected to acid leaching, aluminum removal, copper removal, and extraction to obtain nickel-cobalt-manganese sulfate mixed salt solution, and nickel-cobalt-manganese sulfate mixed salt solution is determined In the nickel-cobalt-manganese molar ratio (0.965:0.12:0.11), take 500mL and put it in a beaker, add 0.09M cobalt sulfate and 0.02M manganese sulfate to the nickel-cobalt-manganese sulfate mixed salt solution, add 40ml into methylcellulose, and fully Stir, keep the temperature at 45°C, add sodium carbonate, stir until complete precipitation, a...

Embodiment 3

[0064] A kind of high nickel sodium ion cathode material, its chemical formula is NaNi 0.68 co 0.23 mn 0.09 o 2 0.037CNP-Al / 0.015NaVO 3 .

[0065] The preparation method of the above-mentioned high-nickel sodium ion positive electrode material comprises the following steps:

[0066] (1) Preparation of nickel-cobalt-manganese materials: the ternary positive electrode material recovered from waste ternary lithium batteries is subjected to acid leaching, aluminum removal, copper removal, and extraction to obtain nickel-cobalt-manganese sulfate mixed salt solution, and nickel-cobalt-manganese sulfate mixed salt solution is determined Medium nickel-cobalt-manganese molar ratio (0.965:0.12:0.11), take 500mL in a beaker, add 0.143M cobalt sulfate, 0.018M manganese sulfate to the nickel-cobalt-manganese sulfate mixed salt solution, add 50mL acrylic acid, stir well, 45℃ Keep the temperature constant, add ammonium carbonate, stir until complete precipitation, and let stand for 3 ho...

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Abstract

The invention discloses a high-nickel sodium ion positive electrode material, a preparation method thereof and a battery, the chemical formula of the high-nickel sodium ion positive electrode material is NaNiaCobMncO2. FCNP-Al/tMVOx, a + b + c = 1, and 0.5 < = alt; 1, 0lt; b is smaller than or equal to 0.25, and a/b is larger than or equal to 2.5, 0lt; c < = 0.3, 0lt; t is less than or equal to 0.1, 0lt; f is less than or equal to 0.1, and M is at least one of sodium, copper, zinc, zirconium or ammonium. The high-nickel sodium ion positive electrode material has good electrochemical performance, and application of the high-nickel sodium ion positive electrode material in batteries is facilitated.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for batteries, and in particular relates to a high-nickel sodium ion positive electrode material, a preparation method thereof and a battery. Background technique [0002] Lithium and sodium plasma batteries are popular in the current battery market for electric vehicles and energy storage due to their high energy density, excellent power characteristics and stability. Specifically, cathode materials with fast ion diffusivity, anode materials with less structural changes and lower voltage are several aspects that are crucial to achieve high-power, high-performance battery performance. Although sodium has the basic advantage of being cheaper, its high specific capacity and reversible cycle life are still inferior to lithium-ion batteries due to the chemical composition of sodium-ion batteries and the crystal structure of cathode materials that are different from lithium-ion batteries. O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62H01M10/054
CPCH01M4/525H01M10/054H01M4/628Y02E60/10H01M4/04H01M4/0471H01M4/131H01M4/1391H01M4/364H01M4/505H01M10/54
Inventor 钟应声余海军谢英豪李爱霞李斌李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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