FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm as well as preparation method and application thereof

A carbon nanotube and composite material technology is applied in the field of battery separators to achieve the effects of suppressing capacity loss, improving positive conductivity, and alleviating battery swelling

Pending Publication Date: 2022-01-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small quantity and high price of separators in the current market, they are mainly used in the field of power lithium battery manufacturing. Therefore, how to make full use of each separator and improve the performance of the separator thickness uniformity and mechanical properties is particularly important.

Method used

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  • FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm as well as preparation method and application thereof
  • FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm as well as preparation method and application thereof
  • FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Weigh ferrous ammonium sulfate, cobalt carbonate, copper nitrate, zinc sulfate heptahydrate, sulfuric acid according to the molar ratio of iron, cobalt, copper, zinc, nickel and carbon atoms 0.1:0.1:0.1:0.1:5:20 Nickel and urea were mixed, and then added to the high-speed centrifugal dispersion tank, and the material was dispersed in the high-speed centrifugal dispersion tank at a speed of 1500r / min for 30 minutes, and the mixture A was obtained by taking it out;

[0035] Step 2: Put the mixture A in a high-temperature tube furnace, and rapidly raise the temperature from room temperature to 140 °C at a rate of 15 °C / min in a flowing argon atmosphere of 100 sccm, keep it warm for 1 hour, and cool it naturally to room temperature after the heat preservation is over. After taking out, obtain product B;

[0036] Step 3: Grind the product B with a mortar for 20 minutes, then put the ground solid powder into a freeze-drying box, and let it stand at a low temperature o...

Embodiment 2

[0041] Step 1: Weigh ferrous sulfate, cobalt nitrate, copper nitrate, zinc sulfate monohydrate, nickel sulfate according to the amount ratio of iron, cobalt, copper, zinc, nickel and carbon atoms 1:1:1:1:20:50 Mix it with urea, then add it to the high-speed centrifugal dispersion tank, disperse the material in the high-speed centrifugal dispersion tank at a speed of 2500r / min for 5 minutes, and take it out to obtain mixture A;

[0042] Step 2: Put the mixture A in a high-temperature tube furnace, and in a flowing argon atmosphere of 100 sccm, rapidly raise the temperature from room temperature to 200°C at a rate of 30°C / min, keep it warm for 0.5h, and cool it naturally to Take out after room temperature, obtain product B;

[0043] Step 3: Grind the product B with a mortar for 25 minutes, then put the ground solid powder into a freeze-drying box, and let it stand at a low temperature of -30°C for 3 hours;

[0044] Step 4: Take the above product out and put it into a high-tempe...

Embodiment 3

[0048] Step 1: Take ferrous chloride, cobalt sulfate, copper nitrate, zinc acetate, nickel sulfate and Mix urea, then add it to the high-speed centrifugal dispersion tank, disperse the material in the high-speed centrifugal dispersion tank at a speed of 2000r / min for 20min, and take it out to obtain mixture A;

[0049] Step 2: Put the mixture A in a high-temperature tube furnace, and rapidly raise the temperature from room temperature to 180°C at a rate of 20°C / min in a flowing argon atmosphere of 100 sccm, keep it warm for 0.8h, and cool it naturally to Take out after room temperature, obtain product B;

[0050] Step 3: Grind the product B with a mortar for 30 minutes, then put the ground solid powder into a freeze-drying box, and let it stand at a low temperature of -20°C for 5 hours;

[0051] Step 4: Take the above product out and put it into a high-temperature tube furnace. In a flowing argon atmosphere of 100 sccm, rapidly raise the temperature to 750 °C at a rate of 20 ...

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Abstract

The invention discloses a preparation method of a FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm. The method comprises the following steps: weighing a self-synthesized high-entropy alloy / carbon nano composite material and a binder according to a ratio, uniformly grinding, dropwise adding a solvent to prepare slurry, and coating a diaphragm base membrane with the slurry by using a coating machine; and performing microwave heating treatment under inert gas protection for 5-30 minutes, enabling the heating temperature of the diaphragm coated with the slurry to be 50-80 DEG C, and cooling the diaphragm to normal temperature at a cooling speed of about 20 DEG C / min after heating to obtain a modified diaphragm with the FeCoCuZn co-doped Ni-based alloy-carbon nano tube composite material coating. The thickness of the FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material coating of the diaphragm is 2-15 [mu]m. When the modified diaphragm is applied to a battery, the conductivity of a positive electrode can be improved, battery expansion can be relieved, the side reaction of the positive electrode and an electrolyte can be inhibited, the mechanical lightness and puncture strength of the diaphragm can be improved, and the safety and self-discharge performance of the battery can be effectively improved.

Description

technical field [0001] The invention belongs to the field of battery technology and relates to a battery diaphragm, in particular to a FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm and a preparation method and application thereof. Background technique [0002] In the structure of the battery, the separator is one of the key inner components. The separator is mainly located between the positive electrode and the negative electrode, and its main function is to separate the active materials of the positive and negative electrodes to prevent the short circuit of the two electrodes due to contact; in addition, during the electrochemical reaction, it can maintain the necessary electrolyte and form a channel for ion movement. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle, and safety performance of the battery. Therefore, the diaphragm mus...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/449H01M50/446H01M10/054
CPCH01M50/403H01M50/449H01M50/446H01M10/054Y02E60/10
Inventor 李嘉胤钱程胡云飞黄剑锋曹丽云罗晓敏郑裕欣岳少雄
Owner SHAANXI UNIV OF SCI & TECH
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