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Iron-based sodium-ion battery positive electrode material and preparation method thereof

A sodium ion battery and cathode material technology, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problem that the electrochemical performance of polyanionic sodium ferric sulfate cathode material is not significant, and the sodium storage capacity cannot be obtained. , cycle stability, high rate performance, low conductivity of the surface carbon coating layer, etc., to achieve the effect of improving cycle stability, inhibiting oxidation and the formation of impurity phases, and easy control of mass percentage

Active Publication Date: 2020-03-27
苏州高博储能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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, 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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  • Iron-based sodium-ion battery positive electrode material and preparation method thereof
  • Iron-based sodium-ion battery positive electrode material and preparation method thereof
  • Iron-based sodium-ion battery positive electrode material and preparation method thereof

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Embodiment 1

[0039] Embodiment 1: prepare sodium ion battery positive pole with Na 3 Fe 2 (SO 4 ) 3 F / CNF cathode material

[0040] 1. Vacuum-dry ferrous sulfate heptahydrate in an oven at 200°C for 10 hours to obtain anhydrous ferrous sulfate.

[0041] 2. Weigh 0.4675g of sodium sulfate, 1.00g of anhydrous ferrous sulfate, 0.1379g of sodium fluoride and 0.0803g (5wt%) of carbon fiber, add them to a 50mL zirconia ball mill jar, add 34g of zirconia balls, set the ball The material ratio is 20:1, filled with argon protection, and ball milled. The rotation rate of the ball mill is 200r / min, the revolution rate is 500r / min, and the ball milling time is 6h.

[0042] 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.

[0043] fig...

Embodiment 2

[0046] Embodiment 2: Preparation of sodium ion button cell

[0047] Weigh Na according to the mass ratio of 8:1:1 3 Fe 2 (SO 4 ) 3 F / CNF-5% positive electrode material 0.8g, conductive carbon material (acetylene black) 0.1g and binder (polyvinylidene fluoride) 0.1g, uniformly dispersed in N-methylpyrrolidone solvent, the mixed slurry obtained is uniform Coated on an aluminum foil, dried in vacuum at 120° C. for 10 h to obtain a positive electrode sheet. Take the metal sodium sheet as the counter electrode, and place it in the CR2032 button battery in the order of the positive pole piece, the diaphragm, the counter electrode, the gasket and the shrapnel, add sodium perchlorate as the solute, and propylene carbonate as the solvent. The electrolyte solution is 1mol / L, and the sodium ion button battery is obtained after packaging.

[0048] Figure 4-6 Respectively, the electrochemical performance curves of the button cell under the potential window of 2.0-4.5V. in, Figure...

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Abstract

The invention discloses an iron-based sodium-ion battery positive electrode material, comprising Na3Fe2(SO4)3F and a carbon-based material embedded into a Na3Fe2(SO4)3F body structure, wherein in theiron-based sodium-ion battery positive electrode material, the mass fraction of the carbon-based material is 1-10%. The invention also provides a preparation method of the iron-based sodium-ion battery positive electrode material. According to the Na3Fe2 (SO4) 3F positive electrode material disclosed by the invention, the sodium storage specific capacity can be ensured, meanwhile, the cycling stability and the rate capability are greatly improved, and the sodium storage electrochemical performance is obviously superior to that of a pure-phase NaxFey(SO4)z material. Compared with other sodium-containing layered transition metal oxide, polyanionic vanadium-based phosphate and other positive electrode materials, the Na3Fe2(SO4)3F positive electrode material has obvious advantages in working potential and energy density.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to an iron-based sodium ion battery cathode material 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 electrodes to store and convert electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054C01G49/00B82Y30/00
CPCB82Y30/00C01G49/009H01M4/5825H01M4/625H01M10/054Y02E60/10
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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