Electrochemical ultra-capacitor taking lithium ion battery electrode material as cathode

Abstract

This invention belongs to capacitor technique field, which in detail is a new electrochemistry super capacitor. The capacitor combines the ion imbed to off imbed mechanism of the lithium ion battery and the double electric layers mechanism into one energy storage device, wherein its negative electrode adopts lithium ion imbed compound material with low imbed level and the positive electrode adopts active carbon or hole carbon to form an anisomerous super capacitor. Its negative electrode materials adopts nanometer sharp crystal rock Li#-[8x / (x+4)]Ti#-[8 / (x+4)]O#-[4] or one or multiple other metal elements mixed compound.

Description

technical field

[0001] The invention belongs to the technical field of capacitors, and in particular relates to a novel high-performance electrochemical supercapacitor. Background technique

[0002] With the continuous development of the economy, it will inevitably lead to the depletion of oil resources, environmental pollution, and the aggravation of global warming. The development of new energy and the comprehensive and efficient development and utilization of energy-saving technology and environmental technology have become a very necessary subject. The development of electric vehicles is imperative, and countries around the world are actively developing fuel cell electric vehicles (FCEV). However, the fuel cell output power (W / Kg) is small and cannot meet the requirements of starting, acceleration and climbing. It must be combined with other secondary batteries or capacitors with long cycle life, high energy density and high current charge and discharge. For example, T...

Examples

Embodiment 1

[0019] Negative electrode Li prepared by solvent dispersion method 4 Ti 5 o 12 Material. First, the titanium compound and the lithium compound are uniformly dispersed and ground with a solvent, and then calcined at 300-1000° C. for 6-48 hours to obtain a product with a particle size of 200 nm. The composition of the negative electrode of the capacitor is according to Li 4 Ti 5 o 12 : conductive agent: binder = 65: 25: 10 weight ratio mixing slurry, then control a certain coating thickness, evenly coated on the aluminum foil current collector. The activated carbon used as the positive electrode material is commercial activated carbon, and the slurry is mixed according to the weight ratio of activated carbon: conductive agent: binder = 80: 10: 10, and then coated on the aluminum foil current collector with a certain thickness. In this embodiment, the coating thickness of the positive and negative electrodes is controlled with the negative electrode material utilization rat...

Embodiment 2

[0021] According to the coating requirements of positive activated carbon in Example 1, a symmetrical 7# (φ10*38L, mm) activated carbon capacitor was assembled, and its diaphragm and electrolyte were the same as in Example 1. The working range of the system is 0V-2.6V, and the discharge curve of the capacitor is as follows figure 1 shown. The discharge capacity is 5Ah, and the average working voltage is 1.3V. The charge and discharge rate characteristics and cycle performance are shown in Table 1.

Embodiment 3

[0023] Negative electrode Li prepared by solid-phase synthesis method 4 Ti 5 o 12 Material. After the titanium compound and the lithium compound are ground uniformly, they are calcined at 300-1000° C. for 6-48 hours to obtain the product. The material has a particle size of 1 μm. Prepare capacitor negative pole and positive pole according to the slurry mixing and coating method in embodiment 1, control negative pole utilization rate 60% equally, make 7# capacitor (φ 10*38L, mm), its diaphragm and electrolytic solution are all the same as embodiment 1. Its characteristics are detailed in Table 1. The system of Example 3 has a specific energy of 3.3Wh / kg, a capacity of 7.6Ah when charged and discharged at 5C, and a capacity of 3.0Ah when charged and discharged at 100C, and a capacity retention rate of 87% after 3000 cycles.

technical field

[0001] The invention belongs to the technical field of capacitors, and in particular relates to a novel high-performance electrochemical supercapacitor. Background technique

[0002] With the continuous development of the economy, it will inevitably lead to the depletion of oil resources, environmental pollution, and the aggravation of global warming. The development of new energy and the comprehensive and efficient development and utilization of energy-saving technology and environmental technology have become a very necessary subject. The development of electric vehicles is imperative, and countries around the world are actively developing fuel cell electric vehicles (FCEV). However, the fuel cell output power (W / Kg) is small and cannot meet the requirements of starting, acceleration and climbing. It must be combined with other secondary batteries or capacitors with long cycle life, high energy density and high current charge and discharge. For example, T...

Examples

Embodiment 1

[0019] Negative electrode Li prepared by solvent dispersion method 4 Ti 5 o 12 Material. First, the titanium compound and the lithium compound are uniformly dispersed and ground with a solvent, and then calcined at 300-1000° C. for 6-48 hours to obtain a product with a particle size of 200 nm. The composition of the negative electrode of the capacitor is according to Li 4 Ti 5 o 12 : conductive agent: binder = 65: 25: 10 weight ratio mixing slurry, then control a certain coating thickness, evenly coated on the aluminum foil current collector. The activated carbon used as the positive electrode material is commercial activated carbon, and the slurry is mixed according to the weight ratio of activated carbon: conductive agent: binder = 80: 10: 10, and then coated on the aluminum foil current collector with a certain thickness. In this embodiment, the coating thickness of the positive and negative electrodes is controlled with the negative electrode material utilization rat...

Embodiment 2

[0021] According to the coating requirements of positive activated carbon in Example 1, a symmetrical 7# (φ10*38L, mm) activated carbon capacitor was assembled, and its diaphragm and electrolyte were the same as in Example 1. The working range of the system is 0V-2.6V, and the discharge curve of the capacitor is as follows figure 1 shown. The discharge capacity is 5Ah, and the average working voltage is 1.3V. The charge and discharge rate characteristics and cycle performance are shown in Table 1.

Embodiment 3

[0023] Negative electrode Li prepared by solid-phase synthesis method 4 Ti 5 o 12 Material. After the titanium compound and the lithium compound are ground uniformly, they are calcined at 300-1000° C. for 6-48 hours to obtain the product. The material has a particle size of 1 μm. Prepare capacitor negative pole and positive pole according to the slurry mixing and coating method in embodiment 1, control negative pole utilization rate 60% equally, make 7# capacitor (φ 10*38L, mm), its diaphragm and electrolytic solution are all the same as embodiment 1. Its characteristics are detailed in Table 1. The system of Example 3 has a specific energy of 3.3Wh / kg, a capacity of 7.6Ah when charged and discharged at 5C, and a capacity of 3.0Ah when charged and discharged at 100C, and a capacity retention rate of 87% after 3000 cycles.

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