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Nickel-rich high-voltage sodium ion battery positive electrode material as well as preparation method and application thereof

A cathode material, sodium ion technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low energy density and poor cycle performance, and achieve the effects of low reaction temperature, good heat dissipation characteristics, and enhanced structural stability

Pending Publication Date: 2022-03-25
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Na 4 co 3 (PO 4 ) 2 P 2 o 7 It operates at 3.0-4.4V (vs Na + / Na) provides 95mAh·g at 0.2C rate in the voltage window -1 capacity, and capacity retention >95% in 100 cycles; Na 4 Fe 3 (PO 4 ) 2 (P 2 o 7 ) released 129mAh·g as a cathode material for sodium-ion batteries -1 reversible capacity, and the average operating voltage exceeds 3.2V (vs Na + / Na) electrode, but for Na 4 MPO 4 For small-scale sodium-ion batteries, low energy density and poor cycle performance are still its biggest shortcomings, and the energy density of the battery depends on the specific capacity and operating voltage of the material. Therefore, it is urgent to develop a high specific capacity and the first working High voltage cathode material

Method used

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  • Nickel-rich high-voltage sodium ion battery positive electrode material as well as preparation method and application thereof
  • Nickel-rich high-voltage sodium ion battery positive electrode material as well as preparation method and application thereof
  • Nickel-rich high-voltage sodium ion battery positive electrode material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0046] The sodium ion cathode material of the present embodiment, its formula is Na 2.6 Ni 1.2 (PO 4 )(SO 4 ) / F@Al 2 o 3 -C.

[0047] The process flow diagram of the sodium ion cathode material prepared in this embodiment is as follows figure 1 as shown, figure 1 In the process, nickel hydroxide was mixed with citric acid to obtain solution A, ammonium sulfate, phosphoric acid and ammonium fluoride were mixed to obtain solution B, stirred, solution B was added to solution A to obtain solution C, solution C was placed in a ceramic crucible, and sent to A microwave reactor is heated and cooled to obtain a trisalt precursor. After ball milling the trisalt precursor, mix it with sodium hydroxide, N,N,N',N'-tetrakis(4-methoxyphenyl)-9H-carbazole-3,6-diamine slurry Uniform, heated to get Na 2.6 Ni 1.2 (PO 4 )(SO 4 ) / F. Aluminum Sulfate and Na 2.6 Ni 1.2 (PO 4 )(SO 4 ) / F infiltration, heating, and cooling to get Na 2.6 Ni 1.2 (PO 4 )(SO 4 ) / F@Al 2 o 3 -C.

[0...

Embodiment 2

[0053] The sodium ion cathode material of the present embodiment, its formula is Na 3.4 Ni 0.8 (PO 4 )(SO 4 ) / F@CuO-C.

[0054] The preparation method of the sodium ion positive electrode material of the present embodiment, concrete steps are as follows:

[0055] (1) Microwave hydrothermal synthesis of tri-salt precursor: 1.24g of nickel sulfate was dissolved in 150mL of 7.1w% oxalic acid to obtain solution A, 19mL of 0.53mol / L ammonium sulfate, 1.33g of diammonium hydrogen phosphate, 12mL of 0.18mol / L Ammonium fluoride was mixed to obtain solution B, stirred, solution B was gradually added dropwise to solution A to obtain solution C, 20mL solution C was taken, solution C was placed in a ceramic crucible, and sent to a microwave reactor, which was filled with argon, Under 500W, set: the heating temperature of the first stage is 115°C, and it is stable for 3 minutes; the heating temperature of the second stage is 240°C, and it is stable for 20 minutes;

[0056] (2) Synthes...

Embodiment 3

[0059] The sodium ion cathode material of the present embodiment, its formula is Na 3 Ni(PO 4 )(SO 4 ) / F@ZnO-C.

[0060] The preparation method of the sodium ion positive electrode material of the present embodiment, concrete steps are as follows:

[0061] (1) Microwave hydrothermal synthesis of trisalt precursor: 1.3g nickel chloride was dissolved in 500mL0.317mol / Lw% citric acid to obtain solution A, 19mL0.53mol / L ammonium sulfate, 1.33g diammonium hydrogen phosphate, 17mL0 .18mol / L ammonium fluoride was mixed to obtain solution B, stirred, solution B was gradually added dropwise to solution A to obtain solution C, 200mL solution C was taken, solution C was placed in a ceramic crucible, and sent to a microwave reactor. Filled with argon, under 350W, set: the first heating temperature is 115°C, steady evaporation for 3 minutes, the second heating temperature is 275°C, steady evaporation for 20 minutes, the heating time between the two stages is 180s, and the temperature is...

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Abstract

The invention belongs to the technical field of sodium ion batteries, and discloses a nickel-rich high-voltage sodium ion positive electrode material and a preparation method and application thereof, the general formula of the sodium ion positive electrode material is NasNit (PO4) (SO4) / F (at) M-C, s is greater than or equal to 2 and less than or equal to 4, and t is greater than or equal to 0.5 and less than or equal to 1.5; m is an oxide of at least one of zinc, nickel, aluminum, manganese, chromium, molybdenum, manganese, copper and calcium. The stabilizer is added into the sodium ion positive electrode material, so that the structural stability of the positive electrode material is enhanced, and the cyclic discharge performance of the material is improved; the coating layer (formed by tightly combining the metal oxide and the positive electrode material) in the sodium ion positive electrode material can stabilize the ion and electron transport dynamics performance of the material, improve the cycle performance of the positive electrode material, prevent the material from continuing to agglomerate and control the particle size.

Description

technical field [0001] The invention belongs to the technical field of sodium-ion batteries, and in particular relates to a nickel-rich high-voltage sodium-ion battery positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have satisfactory properties, such as high energy density and excellent cycle life, and are successfully applied in mobile electronic devices, transportation electric and energy storage power, etc. At present, thanks to the vigorous development of new energy, there is more demand for lithium battery energy storage equipment in fields such as hybrid electric vehicles (HEV), electric vehicles (EV), and smart grids. The current challenge is that the cost of lithium and the materials associated with lithium battery manufacturing has risen sharply, leading to an increase in the price of lithium-ion batteries, so the lack of prospect and uneven distribution of lithium resources has prompt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/5825H01M4/62H01M4/36Y02E60/10C01B25/455H01M10/054H01M4/58H01M2004/028H01M4/366H01M10/54
Inventor 余海军张学梅谢英豪李爱霞钟应声李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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