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Carbon compound cathode material for ultracapacitor battery

A technology for supercapacitor batteries and anode materials, applied in the field of electrochemistry, can solve the problems affecting the high rate of supercapacitor batteries, large capacity and high energy density performance, inability to maximize supercapacitor batteries, poor conductivity of lithium titanium oxide, etc. problems, to achieve good lithium ion intercalation/deintercalation performance, good electric double layer energy storage and lithium ion de/intercalation energy storage characteristics, good high rate charge and discharge performance

Inactive Publication Date: 2011-11-23
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When these anode materials are applied to supercapacitor batteries, they have many disadvantages due to the limitations of their materials: ①The material structure is single, and the form of energy storage is single, which cannot maximize the performance characteristics of the supercapacitor battery's "dual functions", that is, it cannot be used at the same time. The combination of lithium ion chemical energy storage and electric double layer physical energy storage can achieve the purpose of high energy density and high power density; ②Due to the single material, the defects of the material itself cannot be overcome, such as graphite material has poor compatibility with solvents and Disadvantages such as unsatisfactory rate performance, lithium titanium oxide has the disadvantages of poor electrical conductivity, high potential relative to metal lithium and low capacity
The defects of these materials will greatly affect the performance of supercapacitor batteries in terms of high rate, large capacity, and high energy density; ③The electrolyte with good performance usually contains PC solvent, but the current commercial carbon negative electrodes are sensitive to PC solvent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Add 100 grams of surface-nanoized natural graphite, 100 grams of resin, and 300 g of NaOH template agent with a particle size distribution of 1-2 nm, medium particle 5-50 nm, and large particle 60-100 nm, and add them to methanol for mechanical ball milling for 1 hour, then , and evaporated to dryness at a low temperature of 50-60°C to obtain a precursor;

[0029] 2. Heat the prepared precursor to 200°C at a heating rate of 5-10°C / min under an ammonia protective atmosphere, and then heat it to 600°C at a heating rate of 1-5°C / min. , cooled with the furnace after constant temperature for 2h; the core-shell material of the three-dimensional hierarchical hole shell coated with micropores was obtained on the core material; detected by the nitrogen adsorption-desorption isotherm method, the pore size distribution of the micropores was: the pore size of the macropores was 50-120nm, medium pore diameter is 3-50nm, and small pore diameter is less than 2nm.

[0030] 3. Remov...

Embodiment 2

[0038] 1. Add 100 grams of surface-nanometerized artificial graphite, 100 grams of resin, and 300 g of NaOH template agent with a particle size distribution of 1-2 nm, medium particle 5-50 nm, and large particle 60-100 nm, and add them to methanol for mechanical ball milling for 1 hour, then , and evaporated to dryness at a low temperature of 50-60°C to obtain a precursor;

[0039] 2. Heat the prepared precursor to 300°C at a heating rate of 5-10°C / min under an ammonia protection atmosphere, and then heat it to 700°C at a heating rate of 1-5°C / min. , cooled with the furnace after constant temperature for 5h; the core-shell material of the three-dimensional hierarchical pore shell coated with micropores was obtained on the core material; the nitrogen adsorption-desorption isotherm method was used to detect the distribution of the micropore diameter: the macropore diameter was at 50-120nm, medium pore diameter is 3-50nm, and small pore diameter is less than 2nm.

[0040] 3. Rem...

Embodiment 3

[0048] 1. Add 100 grams of mesophase carbon microspheres (CMS) with surface nanometerization, 100 grams of resin, and 300 g of NaOH template agent with a particle size distribution of 1-2nm, 5-50nm, and 60-100nm, into methanol Mechanical ball milling for 1 hour, and then evaporating to dryness at a low temperature of 50-60°C to obtain the precursor;

[0049] 2. Heat the prepared precursor to 400°C at a heating rate of 5-10°C / min under an ammonia protection atmosphere, and then heat it to 800°C at a heating rate of 1-5°C / min. , cooled with the furnace after constant temperature for 10h; the core-shell material of the three-dimensional layered hole shell coated with micropores was obtained on the core material; detected by the nitrogen adsorption-desorption isotherm method, the pore size distribution of the micropores was: macropore pore size 50-120nm, medium pore diameter 3-50nm, small pore diameter less than 2nm.

[0050] 3. Removing the template agent: use dilute nitric acid...

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Abstract

The invention discloses a carbon compound cathode material for an ultracapacitor battery, comprising a nuclear layer and a shell layer, wherein the shell layer accounts for the total weight of 10-40 percent; the nuclear layer is made of graphite materials subjected to surface nanometer treatment; and the shell layer is made of a porous carbon material. The surface nanometer treatment of the nuclear layer is to form a nano carbon fiber, a cabon nanotube or a nano hole on the surface of natural graphite, artificial graphite or an in intermediate phase carbon microsphere material in situ; and the porous carbon material comprises a three-dimensional structure that millipores are distributed on a carbon organism. Metal elements are doped in the shell layer. The component formula is reasonable;the prepared material has the nuclear and shell structures in which the metal elements are doped; meanwhile, the invention has favorable characteristics of energy accumulation by using double electric layers and lithium ion stripping / embedding, can effectively improve the high multiplying power and the power density of a lithium ion battery, meets the double requirements of the ultracapacitor battery on energy accumulation by using the lithium ion and double electric layers of the cathode material, can be used as a cathode of a high-performance lithium ion battery, and has favorable high multiplying power charge-discharge performances and industrial prospect.

Description

technical field [0001] The invention discloses a carbon composite negative electrode material for a supercapacitor battery, in particular to a carbon composite negative electrode material suitable for a new type of energy storage device and a supercapacitor battery that can be charged and discharged at a large rate and has high power density and high energy density . It belongs to the field of electrochemical technology. . Background technique [0002] The increasingly serious global environmental pollution and energy crisis have forced countries to find new sustainable energy sources. Green energy storage devices represented by lithium-ion batteries and supercapacitors have become the focus of attention and research hotspots. Although supercapacitors have the advantages of high power density and long cycle life, their energy density is relatively low; while lithium-ion batteries have the characteristics of high energy density and low self-discharge, but their rate perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01M14/00
CPCY02E60/13
Inventor 周向阳李劼杨娟刘宏专娄世菊
Owner CENT SOUTH UNIV
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