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Nitrogen-doped-polymerized porous nano deposition positive electrode material and preparation method and application thereof

A positive electrode material and nano-deposition technology, applied in the direction of positive electrodes, chemical instruments and methods, nickel compounds, etc., can solve the problems of accelerating electrolyte immersion channels, hindering the normal transmission of sodium ions, destroying mechanical integrity, etc., to facilitate commercial applications , Improved recycling performance, high electrical conductivity and high chemical stability

Pending Publication Date: 2022-03-29
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this phase change and the deintercalation of sodium ions will cause micro-scale stress in the positive electrode material, resulting in microcracks in the surface and interior of the positive electrode material, which will hinder the normal transmission of sodium ions, thereby reducing the capacity retention. This is a serious problem for materials
In addition, the new interface between the positive electrode material and the electrolyte reaction causes the fluoride ions in the electrolyte to react with the exposed nickel and sodium to form fluoride salts, some of which exist in the electrolyte, and some of them migrate to the negative electrode with the charged sodium ions, which intensifies the The collapse of the structure accelerates the passage of electrolyte immersion and destroys the mechanical integrity, which will lead to the attenuation of the electrode material and further deteriorate the cycle performance.

Method used

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  • Nitrogen-doped-polymerized porous nano deposition positive electrode material and preparation method and application thereof
  • Nitrogen-doped-polymerized porous nano deposition positive electrode material and preparation method and application thereof
  • Nitrogen-doped-polymerized porous nano deposition positive electrode material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] The nitrogen-doped-polymeric porous nano-deposition cathode material of the present embodiment has a formula of Na 0.8 Li 0.2 Ni 0.7 co 0.05 Mg 0.0 5 mn 0.2 o 2 @0.05NMC-Cu.

[0041] The preparation method of the nitrogen-doped-polymerized porous nano-deposited positive electrode material in this embodiment, the specific steps are as follows:

[0042] (1) Mix 140ml of 0.5mol / L nickel nitrate, 20ml of 1.0mol / L manganese nitrate, 10ml of 0.5mol / L cobalt nitrate, and 20ml of 0.25mol / L magnesium nitrate in a beaker. Add sodium carbonate to an oil bath box, stir, and separate to obtain a nickel-containing precipitate. Mix 80ml of 1.01mol / L sodium hydroxide and 20ml of 1.0mol / L lithium hydroxide to form a sodium-lithium mixture. The sodium-lithium mixture, containing Nickel precipitation is mixed, stirred, dried, sent to a tube furnace at 670°C for calcination for 10 hours, and ball milled to obtain a high-nickel sodium ion positive electrode material Na 0.8 Li 0.2 ...

Embodiment 2

[0046] The nitrogen-doped-polymeric porous nano-deposition cathode material of the present embodiment has a formula of Na 0.75 Li 0.25 Ni 0.60 co 0.025 Mg 0.025 mn 0.35 o 2 @0.025NMC-Cu.

[0047] The preparation method of the nitrogen-doped-polymerized porous nano-deposited positive electrode material in this embodiment, the specific steps are as follows:

[0048] (1) Mix 120ml of 0.5mol / L nickel sulfate, 35ml of 1.0mol / L manganese sulfate, 5ml of 0.5mol / L cobalt sulfate, and 10ml of 0.25mol / L magnesium sulfate in a beaker, and place the beaker at 55°C In an oil bath, add sodium carbonate, stir, and separate to obtain a nickel-containing precipitate. Mix 75ml of 1.01mol / L sodium hydroxide and 25ml of 1.0mol / L lithium hydroxide to form a sodium-lithium mixture. The sodium-lithium mixture, nickel-containing Precipitate, mix, stir, dry, send to a tube furnace at 670°C for calcination for 10 hours, and ball mill to obtain the high-nickel sodium ion positive electrode materi...

Embodiment 3

[0052] The nitrogen-doped-polymeric porous nano-deposition cathode material of the present embodiment has a formula of Na 0.88 Li 0.12 Ni 0.68 co 0.065 Al 0.05 Mo 0.023 mn 0.182 o 2 @0.0625NMC-Cu.

[0053] The preparation method of the nitrogen-doped-polymerized porous nano-deposited positive electrode material in this embodiment, the specific steps are as follows:

[0054] (1) 0.85mol / L nickel sulfate of 80ml, 1.3mol / L manganese sulfate of 14ml, 0.65mol / L cobalt sulfate of 10ml, 0.5mol / L aluminum chloride of 10ml, 0.74mol / L ammonium molybdate of 3ml Mix in a beaker, place the beaker in an oil bath at 60°C, add sodium carbonate, stir, and separate to obtain a nickel-containing precipitate, mix 195ml of 0.45mol / L sodium acetate and 20ml of 0.61mol / L lithium hydroxide to prepare sodium Lithium mixture, mixing sodium-lithium mixture and nickel-containing precipitation, stirring, drying, sending to a tube furnace at 730°C for sintering for 8 hours, and ball milling to obta...

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Abstract

The invention belongs to the technical field of sodium ion batteries, and discloses a nitrogen-doped-polymerized porous nano-deposited positive electrode material and a preparation method and application thereof, the general formula of the nitrogen-doped-polymerized porous nano-deposited positive electrode material is NatLifNisZ1-sO2 (at) aNMC-Y, 0.8 < = tlt; 1, 0 < = flt; 0.3, 0.5 < = slt; 1, 0lt; a < lt >; z is at least one of Mn, Mo, Co, Mg and Al, and Y is at least one of Cu, Ga, Zn, Cr and Zr. According to the nitrogen-doped-polymerized porous nano deposited positive electrode material prepared by the invention, a plurality of layers of compact films are obtained on the surface of the NMC-Y deposited NatLifNisZ1-sO2 material, and after the nitrogen-doped-polymerized porous nano material is deposited, on one hand, the nitrogen-doped-polymerized porous nano material can contribute a considerable specific surface area; on the other hand, the migration path of ions in the material can be shortened, and the electrochemical performance is improved.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a nitrogen-doped-polymerized porous nanometer-deposited positive electrode material and a preparation method and application thereof. Background technique [0002] Nickel layered oxides, whose energy density increases with the increase of high nickel content in positive electrode materials, have always been favored by battery manufacturers. In addition, cobalt is a rare metal, accounting for only 0.0025% of the earth's crust, which is much lower than the nickel content in the earth's crust. At present, the price of cobalt is much higher than that of nickel. Therefore, the use of high-nickel and low-cobalt layered oxides as the positive electrode material battery is the current main research and development direction of manufacturers. [0003] The development of cobalt-free high-nickel layered oxides should be based on the chemical behavior of cobalt and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/62H01M4/36H01M10/054C01G53/00
CPCH01M4/525H01M4/505H01M4/628H01M4/624H01M4/366H01M10/054C01G53/50C01P2004/03C01P2004/61H01M2004/021H01M2004/028Y02E60/10C01P2002/52C01P2004/51C01P2006/40C01P2006/12H01M4/625
Inventor 钟应声余海军谢英豪李爱霞林波李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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