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Preparation and application method of nanofiber sodium-storage positive material assembled by nanoparticles

A nanofiber and nanoparticle technology, applied in the field of nanofiber sodium storage cathode material preparation, can solve the problems of unsuitability for industrial production, complex synthesis conditions, poor air stability, etc., and achieves easy control of reaction conditions, simple preparation process, and cycle life. boosted effect

Inactive Publication Date: 2019-11-05
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

[0005] In the existing research, layered oxide materials composed of transition metal iron, manganese, nickel, etc. have received extensive attention, and are very likely to achieve large-scale commercial applications, but their morphology and structure are mainly irregular particles. There are disadvantages such as poor rate performance and unstable cycle
such as Na x MnO 2 , although the theoretical specific capacity of this material is very high, due to the strong Jahn-Teller effect, its cycle performance is very poor, far away from practical applications; another example is Na x FeO 2 , the material is very cheap and has a high oxidation-reduction potential, but its synthesis conditions are complicated, and generally sodium oxide or sodium peroxide is required, which is not suitable for industrial production; Na x NiO 2 Because Ni 2+ / Ni 3+ / Ni 4+ It has a strong attraction due to its high potential, but its air stability is poor

Method used

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  • Preparation and application method of nanofiber sodium-storage positive material assembled by nanoparticles
  • Preparation and application method of nanofiber sodium-storage positive material assembled by nanoparticles
  • Preparation and application method of nanofiber sodium-storage positive material assembled by nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0029] 1) Dissolve 4.4g of polyvinylpyrrolidone (PVP) in 30mL of deionized water, stir until completely dissolved, add 3mL of glacial acetic acid to adjust the pH of the solution to 4-5, and make solution A;

[0030] 2) 0.4462g sodium nitrate (NaNO 3 ) (5% excess), 0.727g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), 1.2255g manganese acetate (Mn(CH 3 COOH) 2 4H 2 O) add in solution A successively, form homogeneous solution B under continuous magnetic stirring;

[0031] 3) Transfer the above solution B into a syringe, with 12-15 μL min -1 The propulsion speed is injected into the receiving aluminum foil, the distance between the injector and the receiving aluminum foil is 15-20cm, and a high-voltage electrostatic field of 16-18kV is applied between the injector and the receiving aluminum foil, and the spinning time is 10-15h, and the collected electrospun Film thickness is 30-50μm;

[0032] 4) Heat the electrospun film collected above in an air atmosphere to 500°C at a heating...

Embodiment 2

[0038] 1) Dissolve 4.4g of polyvinylpyrrolidone (PVP) in 30mL of deionized water, stir until completely dissolved, and make solution A;

[0039] 2) 0.4462g sodium nitrate (NaNO 3 ) (5% excess), 0.727g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), 1.250g manganese nitrate (Mn(NO 3 ) 2 4H 2 O) add in solution A successively, form homogeneous solution B under continuous magnetic stirring;

[0040] 3) Transfer the above solution B into a syringe, with 12-15 μL min -1 The propulsion speed is injected into the receiving aluminum foil, the distance between the injector and the receiving aluminum foil is 15-20cm, and a high-voltage electrostatic field of 16-18kV is applied between the injector and the receiving aluminum foil, and the spinning time is 10-15h, and the collected electrospun Film thickness is 30-50μm;

[0041] 4) Heat the electrospun film collected above in an air atmosphere to 500°C at a heating rate of 2°C / min and keep it warm for 2 hours to decompose PVP and form a por...

Embodiment 3

[0045] 1) Dissolve 4.4g of polyvinylpyrrolidone (PVP) in 30mL of deionized water, stir until completely dissolved, add 3mL of glacial acetic acid to adjust the pH of the solution to 4-5, and make solution A;

[0046] 2) 0.7144g sodium acetate (CH 3 COONa·3H 2 O) (5% excess), 0.6218g nickel acetate (Ni(CH 3 COOH) 2 4H 2 O), 1.2255g manganese acetate (Mn(CH 3 COOH) 2 4H 2 O) add in solution A successively, form homogeneous solution B under continuous magnetic stirring;

[0047] 3) Transfer the above solution B into a syringe, with 12-15 μL min -1 The propulsion speed is injected into the receiving aluminum foil, the distance between the injector and the receiving aluminum foil is 15-20cm, and a high-voltage electrostatic field of 16-18kV is applied between the injector and the receiving aluminum foil, and the spinning time is 10-15h, and the collected electrospun Film thickness is 30-50μm;

[0048] 4) Heat the electrospun film collected above in an air atmosphere to 500...

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Abstract

The invention discloses a preparation and an application method of a nanofiber sodium-storage positive material assembled by nanoparticles. The preparation method comprises the following steps: 1) dissolving polyvinylpyrrolidone (PVP) in deionized water, adding glacial acetic acid to adjust pH of the solution to form a solution A, and then successively adding a soluble sodium salt, a soluble nickel salt and a soluble manganese salt to the solution A in proportion, and conducting stirring to form a homogeneous solution B; and 2) preparing composite nanofiber from the solution by electrospinningtechnology, and conducting calcining to decompose polyvinylpyrrolidone and form a porous structure, so as to obtain the nanofiber assembled by Na<2 / 3>Ni<1 / 3>Mn<2 / 3>O<2> nanoparticles. The preparationand application method of the invention have the advantages of simple preparation process, good repeatability and easy-to-control reaction conditions. The obtained material is a the nanofiber assembled by the nanoparticles, wherein the size of the nanoparticles is 20-90 nm, and the diameter of the nanofiber is 200-600 nm. A three-dimensional network framework formed by cross-linking of the fibersenhances the structural stability of the material and promotes rapid insertion-desertion of sodium ions, significantly improves sodium storage capacity, rate performance and cycle life. The nanofibersodium-storage positive material of the invention has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, in particular to Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 Preparation and application method of nanofiber sodium storage cathode material assembled by nanoparticles. Background technique [0002] In recent years, with the rapid development of electric vehicles and smart grids, and people's increasing preference for intermittent renewable clean energy (such as solar energy, wind energy, tidal energy, and geothermal energy), it is imperative to develop large-scale energy storage devices. Despite the excellent performance of lithium-ion batteries, the limited reserves of lithium resources on the earth, uneven distribution, and high prices have become bottlenecks in their development. Sodium ion resources are abundant, widely distributed, and cheap, and sodium and lithium belong to the same main group, have similar physical and chemical properties, and the charging and discharging principles of batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/505H01M4/525H01M4/62H01M10/054B82Y30/00B82Y40/00H01M4/02
CPCB82Y30/00B82Y40/00H01M4/131H01M4/1391H01M4/505H01M4/525H01M4/621H01M4/625H01M10/054H01M2004/028Y02E60/10
Inventor 刘永畅沈秋雨刘凡凡
Owner UNIV OF SCI & TECH BEIJING
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