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Composite positive electrode material and preparation method thereof, positive plate and sodium ion battery

A technology of composite positive electrode material and positive electrode material, which is applied in the field of positive electrode sheet, sodium ion battery, composite positive electrode material and its preparation, can solve the problems of lattice oxygen loss performance, sodium content reduction, capacity reduction and the like, and achieves good stability, The effect of long cycle life and good cycle life

Pending Publication Date: 2022-03-15
SO-FUN TECH CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lattice is stabilized by doping inactive elements, but excessive doping will cause a decrease in capacity and even cause performance degradation due to oxygen loss in the lattice, and doping with high-valent ions will reduce the sodium content in the sodium layer

Method used

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  • Composite positive electrode material and preparation method thereof, positive plate and sodium ion battery
  • Composite positive electrode material and preparation method thereof, positive plate and sodium ion battery
  • Composite positive electrode material and preparation method thereof, positive plate and sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Step S1, press Na 0.73 Nb 0.003 [Mn 0.63 Fe 0.08 Ni 0.20 Li 0.09 ]O 1.996 f 0.004 stoichiometric ratio, the material was prepared using a direct solid-state reaction method with surface doping. According to the stoichiometric ratio, the Na 2 CO 3 , MnO 2 , Fe 2 o 3 , Ni(OH) 2 , Li 2 CO 3 Mix evenly, and obtain the precursor after ball milling, wherein the ball milling time is 10 hours, the rotation speed is 400rpm, and then the precursor is placed in a muffle furnace, and it is roasted at 900°C for 15 hours in an air atmosphere to obtain a non-surface-doped manganese-based layer shape material.

[0040] Step S2, the above product is mixed with a certain amount of niobium ethoxide in ethanol, stirred and dried at 60°C, and then calcined in air at 600°C for 5 hours to perform Nb doping on the surface. Then the above product was mixed with a certain amount of NH 4 Mix F evenly, and bake at 400° C. in air for 5 hours to perform F doping on the surface. Pro...

Embodiment 2

[0042] Step S1, press Na 0.72 Nb 0.002 [Mn 0.63 Fe 0.08 Ni 0.22 Li 0.07 ]O 1.996 f 0.004 Stoichiometric ratio, the material was prepared by co-precipitation method with solid phase reaction and surface doping. According to the stoichiometric ratio, the NiSO 4 , MnSO4 , FeSO 4 Place in deionized water and mix evenly to obtain a salt solution with a total concentration of 1mol / L, configure 0.5mol / L ammonia solution and 2mol / L NaOH solution as complexing agent and precipitant respectively, and then mix the salt solution, complex The agent and the precipitating agent were injected into the reaction vessel at the same time to carry out the co-precipitation reaction. The temperature of the co-precipitation reaction was 50° C., and the pH value was controlled at 11.0 by adjusting the flow rate of the NaOH solution. The resulting precipitate was centrifuged, dried, and Na 2 CO 3 and Li 2 CO 3 Mix according to the metering ratio, then place in a muffle furnace, and bake at...

Embodiment 3

[0045] Step S1, press Na 0.67 Zr 0.002 [Mn 0.71 Ni 0.19 Li 0.10 ]O 1.998 f 0.002 stoichiometric ratio, the material was prepared using a sol-gel method combined with solid-state reaction and surface doping. According to the stoichiometric ratio, the NaNO 3 , LiNO 3 , Mn(NO 3 ) 2 , Ni(NO 3 ) 2 Mix in deionized water, stir to get a sol, then add citric acid, stir well at 60°C to get a gel, then put it in a muffle furnace, and bake it at 920°C in an air atmosphere for 12 hours to get a non-surface-doped gel. Miscellaneous manganese-based layered materials.

[0046] Step S2: Mix the above-mentioned product with a certain amount of zirconium ethoxide in ethanol, stir and dry at 60°C, and then bake in air at 600°C for 5 hours to perform Zr doping on the surface. Then the above product was mixed with a certain amount of NH 4 Mix F evenly, and bake at 400° C. in air for 5 hours to perform F doping on the surface. The product was analyzed by XRD and had a P2 phase. Acco...

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a composite positive electrode material and a preparation method thereof, a positive plate and a sodium ion battery, the chemical general formula of the composite positive electrode material is Na < 0.67 + n > mAmMn < 1-x-y > M1 < x > M2 < y > O < 2-z > F < z >, the material is in a P2 phase, M1 in the formula is at least one of Fe, Ni, Cr, Cu and Co, M2 is at least one of Li, Na, K, Mg, Ca and Sr, A is at least one of Nb, Ta, Zr, Mo and W, x is more than or equal to 0.1 and less than or equal to 0.4, y is more than or equal to 0.01 and less than or equal to 0.1, and x / (1-x-y) is less than or equal to 0.5 and 0 lt; z < = 0.1, 0lt; m < = 0.05, and-0.17 < = n < = 0.13. The positive electrode material provided by the invention has a stable lattice structure and a surface-doped modification layer structure, effectively inhibits harmful phase change in charging and discharging processes, and has the advantages of good stability, high specific capacity, good rate capability and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a composite positive electrode material, a preparation method thereof, a positive electrode sheet and a sodium ion battery. Background technique [0002] With the rapid advancement of automobile electrification, the demand for lithium-ion power batteries is huge, resulting in increasingly tight supply of lithium resources and high prices. On the other hand, it is imperative to develop clean energy based on scenery. In order to improve the utilization efficiency of clean energy, it is necessary to configure energy storage batteries. In view of the current dominance of lithium-ion batteries in energy storage batteries, the rapid development of the energy storage industry has also exacerbated the rapid consumption of lithium resources. Therefore, it is imminent to develop new energy storage batteries for lithium-ion batteries. Sodium-ion batteries have compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/36H01M10/054C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/054C01G53/44C01P2002/72C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 徐雄文涂健谢健
Owner SO-FUN TECH CORP LTD
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