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Carbon composite sodion anode material and preparation method thereof

A cathode material, sodium ion technology, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve the problems of low conductivity of surface carbon layer coating, insufficient carbonization of organic carbon sources, and little effect of conductivity , to achieve the effect of improving charge transport capacity, inhibiting the production of impurity phase, and simple production process

Active Publication Date: 2018-10-19
苏州高博储能科技有限公司
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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 layer coating itself have low conductivity, which is not conducive to the improvement of Na x Fe y (SO 4 ) z The electrical conductivity of the material does not play a big role

Method used

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  • Carbon composite sodion anode material and preparation method thereof
  • Carbon composite sodion anode material and preparation method thereof
  • Carbon composite sodion anode material and preparation method thereof

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preparation example Construction

[0028] The preparation method of carbon composite sodium ion cathode material is synthesized according to the following steps:

[0029] S0, drying ferrous sulfate hydrate in vacuum to obtain anhydrous ferrous sulfate, specifically, the drying temperature is 25°C-250°C, and the drying time is 1h-48h.

[0030] S1. Mix anhydrous ferrous sulfate, sodium sulfate and carbon-based materials to form a mixed material. Specifically, mix the above-mentioned dried anhydrous ferrous sulfate with sodium sulfate and carbon-based materials, wherein sodium sulfate and The molar ratio of ferrous sulfate water is 1:2 to 3:1. Specifically, the molar ratio of the sodium sulfate and the anhydrous ferrous sulfate can be 1:1, 1:2, 2:1, 3:1 or 3 : 5 mixed, the carbon-based material is carbon nanotube, carbon fiber, reduced graphene oxide or graphene etc., in the mixed material, the carbon-based material quality is 1% of the ferrous sulfate and sodium sulfate mixture -10%.

[0031] S12. Grinding and mi...

Embodiment 1

[0039] S0. Vacuum-dry ferrous sulfate heptahydrate in an oven at 200°C for 10 hours to obtain anhydrous ferrous sulfate.

[0040] S1. Weigh 0.77g sodium sulfate and 1.365g FeSO 4 and 0.1068g CNT were added to a 50mL zirconia ball mill jar for mixing.

[0041] S12. Add 45g of zirconia balls, set the ball-to-material ratio to 1:20, fill it with argon gas protection, and perform ball milling. The ball milling speed is 600r / min, the revolution speed is 1000r / min, and the ball milling time is 6h, and the positive electrode material is obtained. Precursor.

[0042] S2. Transfer the above-mentioned positive electrode material precursor to a tube furnace, perform heat treatment under an argon protective atmosphere, sinter at 350° C. for 5 hours, and grind the sintered product into powder to obtain a 5% carbon nanotube composite sodium ion positive electrode material, named Na 6 Fe 5 (SO 4 ) 8 / CNT-5%.

[0043] like figure 1 As shown, it can be seen that carbon nanotubes are cl...

Embodiment 2

[0049] S0. Vacuum-dry ferrous sulfate heptahydrate in an oven at 200°C for 10 hours to obtain anhydrous ferrous sulfate.

[0050] S1. Weigh 0.7102g of Na 2 SO 4 , 0.76g of FeSO 4 and 0.0735g CNF were added to a 50mL zirconia ball mill jar for mixing.

[0051] S12. Add 45g of zirconia balls, set the ball-to-material ratio to 1:20, fill with argon gas protection, and perform ball milling. The ball milling autopropagation rate is 600r / min, the revolution rate is 1000r / min, and the ball milling time is 6h to obtain the positive electrode material Precursor.

[0052] S2. Transfer the above positive electrode material precursor to a tube furnace, perform heat treatment under an argon protective atmosphere, sinter at 350° C. for 5 hours, and grind the sintered product into powder to obtain a 5% carbon nanotube composite sodium ion positive electrode material, named Na 2 Fe 1 (SO 4 ) 2 / CNF-5%.

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Abstract

The invention discloses a preparation method of a carbon composite sodion anode material. The method comprises the following steps of S1, uniformly mixing ferrous sulfate, sodium sulfate and a carbon-based material to obtain an anode material precursor; S2, sintering the anode material precursor under the oxygen-free condition at the temperature of 300 DEG C to 450 DEG C to obtain the carbon composite sodion anode material, wherein carbon is embedded into the sodion anode material. According to the carbon composite sodion anode material prepared through the method provided by the invention, the carbon is embedded into the sodion anode material so as to play a role of a bridge, and NaxFey(SO4)z particles are stringed into a three-dimensional network-shaped carbon-based framework, so that the charge transmission capability among anode material particles can be remarkably improved; due to the introduction of the carbon-based material, the production of impurity phases is inhibited, and the yield of target materials is remarkably improved.

Description

technical field [0001] The invention relates to a battery positive electrode material, in particular to a carbon composite sodium ion positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in consumer markets such as portable electronic products and electric vehicles due to their high capacity, high energy, good cycle reversibility and mature industrialization technology. However, due to the limited content of lithium in the earth's crust and the immature recycling technology of lithium-ion batteries, the production cost and sales price of lithium-ion batteries continue to rise, which limits the application of lithium-ion batteries in large-scale energy storage systems in the future. Therefore, the future large-scale energy storage technology urgently needs a cheap electrochemical energy storage device and device to realize the cyclic and efficient utilization of renewable energy. Sodium-ion ba...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/052
CPCH01M4/364H01M4/5825H01M4/583H01M10/052Y02E60/10
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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