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(Li4Ti5O12-Li2TiO3)-(AC-Li2MnO4) hybrid super capacitor

A technology of supercapacitors and conductive agents, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of rapid capacity decay, easy generation of large polarization, and generation of a large amount of gas, and achieve the improvement of charge and discharge capacity and cycle stability, and the improvement of the rate and Cycle life, effect of reducing polarization phenomenon

Active Publication Date: 2017-05-31
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But Li 4 Ti 5 o 12 The intrinsic conductivity of the material is low, large current discharge is likely to produce large polarization, the capacity decays quickly, and the rate performance is poor
On the other hand, Li 4 Ti 5 o 12 The electrode potential is high (1.55V vs Li + / Li), after being assembled with activated carbon into an asymmetric hybrid supercapacitor (1.5-2.8V), the positive electrode activated carbon (AC) material is in a high voltage state (4.35V Li + / Li, under theoretical conditions), thus triggering a large number of side reactions inside the monomer, and finally producing a large amount of gas, which accelerates the decay of the life of the system
Therefore, in the actual application process, it is difficult to meet the requirements of high power and long life of supercapacitors.

Method used

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  • (Li4Ti5O12-Li2TiO3)-(AC-Li2MnO4) hybrid super capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Lithium titanate, lithium metatitanate, conductive agent SuperP, binder SBR, and dispersant CMC were weighed according to the mass ratio of 85:4:5:4:2 and dissolved in deionized water in sequence, using high-speed stirring equipment Stir under vacuum for 5 hours to form a uniform slurry, and use special coating equipment to evenly coat both sides of the corroded aluminum foil, and perform stepwise drying while coating. During the coating process, the thickness of the pole piece is controlled at 80 μm, and the dried electrode is rolled, and the thickness of the electrode is controlled at 50 μm. The resulting density is 1.88g / cm 3 The negative electrode, and then use the punching machine to get the negative pole piece.

[0026] Activated carbon, lithium manganate with layered structure, conductive agent Super P, binder SBR, and dispersant CMC were weighed according to the mass ratio of 80:7:5:6:2 and dissolved in deionized water in sequence. The stirring equipment stirs...

Embodiment 2

[0030] The preparation method of this embodiment is the same as that of Example 1, and (Li 4 Ti 5 o 12 -Li 2 TiO 3 ) / (AC-Li 2 MnO 4 ) hybrid supercapacitor. The only difference is that the mass ratio of lithium titanate, lithium metatitanate, conductive agent SuperP, binder SBR, and dispersant CMC in the negative electrode slurry is 80:5:6:7:2. The mass ratio of activated carbon, layered lithium manganate, conductive agent Super P, binder SBR, and dispersant CMC in the positive electrode slurry is 81:10:3:5:1.

[0031] After testing: under the condition of current density of 0.1A / g, the specific energy of the hybrid supercapacitor is 17.13Wh / kg, and the capacity retention rate under the condition of 3A / g is 90% (compared to 0.1A / g). Under the condition of current density of 0.5A / g, after 15000 cycles, the capacity retention rate is over 91%.

Embodiment 3

[0033] The preparation method of this embodiment is the same as that of Example 1, and (Li 4 Ti 5 o 12 -Li 2 TiO 3 ) / (AC-Li 2 MnO 4 ) hybrid supercapacitor. The only difference is that the mass ratio of lithium titanate, lithium metatitanate, conductive agent SuperP, binder SBR, and dispersant CMC in the negative electrode slurry is 88:3:5:2:2. The mass ratio of activated carbon, layered lithium manganate, conductive agent Super P, binder SBR, and dispersant CMC in the positive electrode slurry is 78:12:3:5:2.

[0034] After testing: under the condition of current density of 0.1A / g, the specific energy of the hybrid supercapacitor is 16.84Wh / kg, and the capacity retention rate under the condition of 3A / g is 90% (compared to 0.1A / g). Under the condition of current density of 0.5A / g, after 15000 cycles, the capacity retention rate is over 92%.

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Abstract

The invention relates to a (Li4Ti5O12-Li2TiO3)-(AC-Li2MnO4) hybrid super capacitor which comprises a positive electrode, a negative electrode, a diaphragm, en electrolyte solution and a shell. The negative electrode comprises a current collector and a negative electrode material formed on the surface of the current collector, the negative electrode material is obtained by drying negative electrode slurry which is a solution formed by Li4Ti5O12, Li2TiO3, a conductive agent, a binder and a dispersant solution in a dispersion medium, and the mass ratio of Li4Ti5O12, Li2TiO3, a conductive agent, a binder and a dispersant solution is (75-90):(2-8):(5-8):(2-7):(1-2). The hybrid super capacitor has the advantages that composite materials of activated carbon and lithium titanate are taken as positive and negative electrodes respectively, polarization in the materials is reduced while energy density is increased, and multiplying power and cycle life of the device are increased and the like.

Description

technical field [0001] The present invention relates to a kind of supercapacitor, relate in particular to a kind of (Li 4 Ti 5 o 12 -Li 2 TiO 3 ) / (AC-Li 2 MnO 4 ) hybrid supercapacitor, which belongs to the technical field of energy storage devices. Background technique [0002] With the rapid development of modern society, supercapacitors have the advantages of high power density, long cycle life, green environmental protection and no pollution. Digital equipment products, smart grid and wind power pitch system and other fields. However, due to the insufficiency of the carbon-based electric double layer energy storage principle, the field of supercapacitors as active power sources is greatly limited. [0003] In recent years, scientific researchers have begun to study the "internal crossover" of lithium-ion batteries and electric double-layer supercapacitors. By combining the electrode materials of electric double-layer capacitors and lithium-ion batteries, the batt...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/46H01G11/32
CPCH01G11/30H01G11/32H01G11/46Y02E60/13
Inventor 阮殿波刘秋香杨斌乔志军吴奕环
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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