Negative plate of lithium ion capacitor and lithium ion capacitor using the negative plate

A lithium ion and capacitor technology, applied in the field of electrochemical energy storage devices, can solve the problems of limited energy density, high production cost, and increased lithium ion diffusion time, so as to achieve improved energy density and power density, low cost, and high current The effect of charging and discharging ability

Active Publication Date: 2017-10-31
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature Journal of The Electrochemical Society, 2012, 159: A1240 uses soft carbon with a particle size of 40 μm as the negative electrode material. Although it shows the electrochemical characteristics of lithium-ion capacitors, the energy density is only 21.7Wh / kg, and micron-sized carbon is used materials, increasing the diffusion time of lithium ions in the material, thus limiting the energy density under high current
Patent CN201410310613 uses lithium titanate material as the negative electrode material of lithium ion capacitor, and lithium titanate material has a lithium intercalation / delithiation potential as high as 1.5V vs. Li + / Li, so that the working voltage of the entire capacitor device is only 1.5~3V, which also limits the energy density.
Patent 20141010401 discloses a lithium ion capacitor, which uses metal lithium or lithium alloy directly as the negative electrode, and lithium ion capacitor is a power type energy storage device, if metal lithium or lithium alloy is directly used as the negative electrode, it is easy to Lithium dendrites grow on the surface, thereby penetrating the diaphragm, short-circuiting the positive and negative electrodes, causing fire and explosion safety accidents
Patent CN201210585579 discloses a lithium ion capacitor negative electrode, the negative electrode active material is graphite for lithium ion batteries, graphitized mesophase carbon microsphere materials, the particle size of these industrial materials is above 20 μm, the lithium ion diffusion path is long, Moreover, the distance between graphite layers is small, and lithium ions are not easily embedded in the graphite layer, which also limits the power performance of lithium-ion capacitors. In addition, during the preparation of graphite materials, high-temperature graphitization treatment at 2800 ° C for a long time is required, and the production cost is high.

Method used

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  • Negative plate of lithium ion capacitor and lithium ion capacitor using the negative plate
  • Negative plate of lithium ion capacitor and lithium ion capacitor using the negative plate
  • Negative plate of lithium ion capacitor and lithium ion capacitor using the negative plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of spherical polyimide carbon material: 4,4'-diaminodiphenyl ether was added to a 250ml three-necked flask, and argon gas was introduced to let the entire reaction under the protection of argon gas. Pour in an appropriate amount of N,N'-dimethylformamide and place it in a water bath at 80 degrees Celsius and stir to dissolve. Then add polyvinylpyrrolidone to the solution and stir for 10min to dissolve. After that, pyromellitic anhydride was added to the solution three times, and the interval between each addition was not less than 10 minutes. After all the pyromellitic anhydride is added, pour the remaining N,N'-dimethylformamide and stir at 80°C for 4-6 hours to obtain a polyamic acid solution with a solid content of 10%. Then, the above solution was poured into the reaction kettle and placed in an oven at 180 degrees Celsius for hydrothermal reaction for 8-10 hours. Take out the reaction kettle, pour out the supernatant, take out the precipitate, wash wit...

Embodiment 2

[0036] In Example 1, the carbonization temperature of the spherical polyimide was changed to 700°C to obtain a spherical polyimide carbon material. The particle size of the material was 5-10 nm. The specific surface area of ​​the material was tested by low-temperature nitrogen adsorption. 130 m surface area 2 / g. The rest of the manufacturing process is the same as in Example 1.

[0037] Lithium-ion capacitor charge and discharge test: After the pre-insertion of lithium is completed, the positive and negative electrodes are formed into a loop, and the 1C rate current is used for charge and discharge. The voltage range is 2~4V. The charge and discharge curves are shown in the attachment. figure 2 , Table 1 shows that the energy density of the lithium-ion capacitor based on the sum of the masses of the two-pole active material is as high as 103.8 Wh / kg under 1C rate current; under 30C rate current, the energy density is 75.3 Wh / kg. After 1500 times of charge and discharge, the ca...

Embodiment 3

[0039] In Example 1, the carbonization temperature of the spherical polyimide was changed to 900°C to obtain a spherical polyimide carbon material. The particle size of the material was 5-10 nm. The specific surface area of ​​the material was tested by low-temperature nitrogen adsorption. Surface area is 135 m 2 / g, the rest of the manufacturing process is the same as in Example 1.

[0040] Lithium-ion capacitor charge and discharge test: After the pre-insertion of lithium is completed, the positive and negative electrodes are formed into a loop, and the 1C rate current is used for charge and discharge. The voltage range is 2~4V. The charge and discharge curves are shown in the attachment. figure 1 , Table 1 shows that the energy density of the lithium ion capacitor based on the sum of the masses of the two-electrode active material is as high as 97.2 Wh / kg under 1C rate current; under 30C rate current, the energy density is 72.9 Wh / kg. After 1500 times of charge and discharge, th...

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Abstract

The invention discloses a lithium ion capacitor cathode piece, and cathode piece is formed by mixing active material, conductive agent and binder into sizing agent and then coating the sizing agent on a current collector. the active material is spherical polyimide charcoal, and the current collector has pore structures which allow the lithium ions to pass through freely, and the aperture ration is 20% - 60%, and the thickness is 10-30Mum. The cathode piece has the advantages of good spherical degree, small particle size, high specific surface area, good conductivity and low cost. In addition, the cathode piece can effectively improve the speed of the lithium ion of the lithium ion capacitor that embeds / remove out of negative electrode materials, so as to improve the large current discharge capacity of the lithium ion capacitor. The invention also discloses a lithium ion capacitor using the cathode pieces. The lithium ion capacitor includes an anode, a cathode, a diaphragm, electrolyte and lithium auxiliary electrodes.

Description

Technical field [0001] The invention relates to an electrochemical energy storage device, in particular to a lithium ion capacitor negative plate and a lithium ion capacitor using the negative plate. Background technique [0002] In the global trend of attaching great importance to climate change, energy conservation and carbon reduction, the new energy industry has become one of the strategic emerging industries in the new century. As an important support and auxiliary technology for the new energy industry, the energy storage new material industry has attracted attention from all parties. In my country, with the rapid development of pure electric vehicles and hybrid vehicles, the steady advancement of smart grids, the large-scale access of renewable energy such as wind and solar energy, and the increase of regional peak loads, various application problems have also emerged. Higher requirements are put forward on the energy density, power density and service life of energy stor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/50H01G11/24H01G11/06
CPCY02E60/13
Inventor 崔光磊韩鹏献姚建华韩晓琪
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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