Synthesis method of tunnel layered intergrowth phase sodium manganate serving as positive electrode material of sodium-ion battery

A technology of sodium ion battery and material sodium manganate, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing the volume energy density of sodium ion batteries, difficult to mass-produce, poor cycle performance, etc., to improve the cycle performance. Effects of stability, alleviation of phase transition stress, and high charge-discharge specific capacity

Pending Publication Date: 2021-07-20
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low tap density of nanopowder particles reduces the volumetric energy density of Na-ion batteries, and these synthetic methods are difficult to produce on a large scale.
[0004] Na in layered phase structure 0.7 MnO 2 It has a high theoretical capacity, but due to the layered phase structure in the charge and discharge process, with the Na + The intercalation and deintercalation will cause large volume changes and generate large phase transition stresses, resulting in poor cycle performance

Method used

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  • Synthesis method of tunnel layered intergrowth phase sodium manganate serving as positive electrode material of sodium-ion battery
  • Synthesis method of tunnel layered intergrowth phase sodium manganate serving as positive electrode material of sodium-ion battery
  • Synthesis method of tunnel layered intergrowth phase sodium manganate serving as positive electrode material of sodium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] NaHCO 3 :NaF:MnCO 3 After weighing the raw materials according to the molar ratio of 4:1:10, put them into a ball mill jar and mill them in a planetary ball mill at a speed of 500 rpm for 12 hours to obtain a uniformly mixed precursor. The precursor obtained after ball milling was put into a corundum crucible, heated to 850°C in a muffle furnace at a heating rate of 2°C / min, and taken out after holding for 12 hours to obtain Na 0.5 MnO 2-x f x powder.

[0023] Na 0.5 MnO 2-x f x After the powder, the conductive agent (Super P) and the binder (PVDF) were ground uniformly according to the mass ratio of 8:1:1, an appropriate amount of N-methylpyrrolidone was added and stirred for 12 hours to obtain a uniform slurry. The slurry is coated on carbon-coated aluminum foil, and the coated wet film thickness is 100 μm, and then the coated aluminum foil is placed in a vacuum oven at 100 ° C for 24 hours to obtain the positive electrode sheet of the sodium ion battery, and p...

Embodiment 2

[0026] This embodiment is basically the same as embodiment 1, the only difference is the NaHCO in the precursor 3 :NaF:MnCO 3 The molar ratio is 1:1:4. NaHCO 3 :NaF:MnCO 3 After weighing the raw materials according to the molar ratio of 1:1:4, put them into a ball mill jar and mill them in a planetary ball mill at a speed of 500 rpm for 12 hours to obtain a uniformly mixed precursor. The precursor obtained after ball milling was put into a corundum crucible, heated to 850°C in a muffle furnace at a heating rate of 2°C / min, and taken out after holding for 12 hours to obtain Na 0.5 MnO 2-x f x powder.

[0027] Na 0.5 MnO 2-x f x The powder, the conductive agent (Super P) and the binder (PVDF) are ground evenly according to the mass ratio of 8:1:1, and an appropriate amount of N-methylpyrrolidone is added and stirred for 12 hours to obtain a uniform slurry. The material was coated on carbon-coated aluminum foil with a wet film thickness of 100 μm, and then the coated al...

Embodiment 3

[0034] This comparative example is basically the same as Example 1, the only difference is that NaHCO in the precursor 3 :MnCO 3 The molar ratio is 1:2. NaHCO 3 :MnCO 3 After weighing the raw materials according to the molar ratio of 1:2, put them into a ball mill jar and mill them in a planetary ball mill at a speed of 500 rpm for 12 hours to obtain a uniformly mixed precursor. The precursor obtained after ball milling was put into a corundum crucible, heated to 850°C in a muffle furnace at a heating rate of 2°C / min, and taken out after holding for 12 hours to obtain Na 0.5 MnO 2-x f x powder.

[0035] will get Na 0.5 MnO 2-x f x After the powder, the conductive agent (Super P) and the binder (PVDF) were ground uniformly according to the mass ratio of 8:1:1, an appropriate amount of N-methylpyrrolidone was added and stirred for 12 hours to obtain a uniform slurry. The slurry was coated on the carbon-coated aluminum foil with a wet film thickness of 100 μm, and then ...

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Abstract

The invention discloses a synthesis method of tunnel layered intergrowth phase sodium manganate serving as a positive electrode material of a sodium-ion battery. According to the method, the sodium ion positive electrode material Na0.5MnO<2-x>Fx with a tunnel phase and layered phase intergrowth structure is synthesized in one step by adopting a solid-phase sintering method. The layered phase structure in the intergrowth phase plays a role in improving the charge-discharge specific capacity, and the tunnel structure in the intergrowth phase inhibits the volume change of the material in the charge-discharge process and plays a role in improving the cycle stability. The synthesis method is simple, the raw materials are low in price, and the synthesized tunnel layered intergrowth phase Na0. 5MnO<2-x>Fx serving as a sodium-ion battery positive electrode material has high charge-discharge specific capacity, cycle performance and rate capability and has wide application prospects in the aspect of large-scale energy storage.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and relates to a sodium ion battery positive electrode material sodium manganate (Na 0.5 MnO 2-x f x ) synthesis method. Background technique [0002] Secondary sodium-ion batteries have abundant sodium resources and high energy density, making them suitable for large-scale energy storage devices. At present, the large-scale application of new energy electric vehicles and smart grids has become a new field of secondary rechargeable batteries. In such a large energy storage system, material costs and maintenance costs are equally important. Although the abundant manganese resources in the earth's crust reduce the material cost of manganese-based layered oxide cathodes for sodium-ion batteries, their large volume changes and phase transition stresses during charging and discharging lead to poor cycle stability, which increases maintenance costs and hinders practical application of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/58H01M10/054H01M4/36
CPCH01M4/485H01M4/505H01M4/5825H01M10/054H01M4/366Y02E60/10
Inventor 姚尧鲁皓辰夏晖
Owner NANJING UNIV OF SCI & TECH
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