Sodium ion total battery and preparation method thereof

A full battery and sodium ion technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problem of insignificant electrochemical performance of polyanionic sodium ferric sulfate cathode materials, failure to obtain sodium storage capacity, cycle Stability, high rate performance, low conductivity of the surface carbon coating, etc., to achieve the effect of improving cycle stability, inhibiting the formation of oxidation and impurity phases, and easy to adjust the mass percentage

Active Publication Date: 2020-04-24
苏州高博储能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method applies to Na x Fe y (SO 4 ) z In material modification technology, due to Na x Fe y (SO 4 ) z The very low preparation temperature of the material, generally lower than 450°C, leads to the following problems: 1. Insufficient carbonization of the organic carbon source, which makes the prepared surface carbon coating layer itself low in electrical conductivity, which is not conducive to the improvement of Na x Fe y (SO 4 ) z The electrical conductivity of the material plays little role
Therefore, the irreversible oxidation of Fe elements and the formation of impurity phases during its preparation cannot be effectively suppressed, as well as the structural collapse caused by phase transition or reaction stress enrichment during electrochemical sodium storage.
Therefore, this scheme has no significant effect on improving the electrochemical performance of polyanionic sodium ferric sulfate cathode materials, and fails to obtain ideal sodium storage capacity, cycle stability and high rate performance.

Method used

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  • Sodium ion total battery and preparation method thereof
  • Sodium ion total battery and preparation method thereof
  • Sodium ion total battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: prepare Na 3 Fe 2 (SO 4 ) 3 F / CNF-5% cathode material

[0044] 1. Vacuum-dry ferrous sulfate heptahydrate in an oven at 200°C for 10 hours to obtain anhydrous ferrous sulfate.

[0045] 2. Weigh 0.4675g of sodium sulfate, 1.00g of anhydrous ferrous sulfate, 0.1379g of sodium fluoride and 0.0803g of carbon fiber, add them to a 50mL zirconia ball mill jar, add 33g of zirconia balls, and set the ball-to-material ratio to 20 : 1, fill into argon protection, carry out ball milling, ball milling rotation rate is 200r / min, revolution rate is 500r / min, ball milling time is 6h.

[0046] 3. Transfer the ball-milled composite precursor to a tube furnace, heat-treat it under an argon protective atmosphere, and calcinate it at 350°C for 5 hours, and grind the calcined product into powder to obtain a composite material containing 5% carbon fiber. for Na 3 Fe 2 (SO 4 ) 3 F / CNF-5% cathode material.

[0047] figure 1 for Na 3 Fe 2 (SO 4 ) 3 The electron cloud...

Embodiment 2

[0050] Embodiment 2: prepare Na 3 Fe 2 (SO 4 ) 3 F / CNF-2% cathode material

[0051] 1. Vacuum-dry ferrous sulfate heptahydrate in an oven at 200°C for 10 hours to obtain anhydrous ferrous sulfate.

[0052] 2. Weigh 0.4675g of sodium sulfate, 1.00g of anhydrous ferrous sulfate, 0.1379g of sodium fluoride and 0.0321g of carbon fiber, add them to a 50mL zirconia ball mill jar, add 33g of zirconia balls, and set the ball-to-material ratio to 20 : 1, fill into argon protection, carry out ball milling, ball milling rotation rate is 200r / min, revolution rate is 500r / min, ball milling time is 6h.

[0053] 3. Transfer the ball-milled composite precursor to a tube furnace, heat-treat it under an argon protective atmosphere, and calcinate it at 350°C for 5 hours, and grind the calcined product into powder to obtain a composite material containing 2% carbon fiber, record for Na 3 Fe 2 (SO 4 ) 3 F / CNF-2% cathode material.

[0054] Na 3 Fe 2 (SO 4 ) 3 The SEM image and HRTEM i...

Embodiment 3

[0055] Embodiment 3: Preparation of sodium ion full battery

[0056] 1. Weigh Na 3 Fe 2 (SO 4 ) 3 F / CNF-5% positive electrode material 0.8g, according to the mass ratio of 8:1:1, respectively weigh 0.1g of acetylene black as conductive carbon and 0.1g of polyvinylidene fluoride as binder, and disperse the above three materials in N-methylpyrrolidone solvent, mixed uniformly, coated on an aluminum foil, and dried under vacuum at 120° C. for 12 hours to obtain a positive electrode sheet.

[0057] 2. Weigh 0.7g of hard carbon negative electrode material, weigh 0.2g of acetylene black as conductive carbon and 0.1g of polyvinylidene fluoride as binder respectively according to the mass ratio of 7:2:1, and disperse the above three materials in N-methylpyrrolidone solvent, mixed evenly, coated on copper foil, dried under vacuum condition at 120° C. for 12 hours, to obtain negative electrode sheet.

[0058] 3. Place in the CR2032 button battery in the order of the positive pole p...

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Abstract

The invention discloses a preparation method of a sodium ion total battery. The preparation method comprises the steps of S1 uniformly mixing a Na3Fe2 (SO4) 3F / C positive electrode material, a conductive carbon material and a binder in a solvent, coating an aluminum foil current collector with the mixture, and carrying out drying treatment to obtain a positive electrode plate; S2 uniformly mixinga hard carbon negative electrode material, a conductive carbon material and a binder in a solvent, coating a copper foil current collector with the mixture, and carrying out drying treatment to obtaina negative electrode plate; and S3 assembling the positive electrode plate and the negative electrode plate by adopting a diaphragm, a gasket, an elastic piece, a positive pole shell and a negative pole shell, adding an electrolyte, and packaging to obtain the sodium ion total battery. According to the sodium ion total battery disclosed by the invention, the positive electrode is prepared from the Na3Fe2 (SO4) 3F / C positive electrode material, so that the sodium storage specific capacity can be ensured, meanwhile, the cycling stability and the rate capability are greatly improved; the sodiumstorage electrochemical performance is obviously superior to that of a pure-phase NaxFly (SO4) z material; and compared with other sodium-containing layered transition metal oxides, polyanionic vanadium-based phosphates and other positive electrode materials, the positive electrode material has obvious advantages in the aspects of working potential and energy density.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a sodium ion full battery with low cost, high working potential and high energy density and a preparation method thereof. Background technique [0002] With the rapid development of pure electric vehicles and large-scale energy storage systems, the demand for lithium-ion batteries as a core component has increased dramatically. However, the content of lithium in the earth's crust is very limited, and the recycling and reuse of lithium-ion batteries cannot be realized efficiently, resulting in a continuous increase in the sales price of lithium-ion batteries, which affects the promotion and promotion of new energy electric vehicles and energy storage power stations. application. [0003] Sodium-ion batteries have a very similar working principle to lithium-ion batteries, using the reversible intercalation and intercalation of sodium ions in the positive and negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054H01M10/058
CPCH01M4/362H01M4/5825H01M4/583H01M10/054H01M10/058H01M2004/027H01M2004/028Y02E60/10Y02P70/50
Inventor 赵建庆李世玉高立军
Owner 苏州高博储能科技有限公司
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