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Method for preparing composite carbon cathode material for super-capacitor battery

A technology of supercapacitor battery and negative electrode material, applied in the field of electrochemistry, can solve the problem of high rate, large capacity and high energy density performance of supercapacitor battery, unable to maximize supercapacitor battery, poor conductivity of lithium titanium oxide, etc. problems, to achieve good lithium ion intercalation/de-cycling performance, excellent capacitor energy storage performance, and good high-rate charge-discharge performance.

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

[0038] 1. Mixing the surface nano-sized natural graphite and resin in a ratio of 1:1 by weight, and at the same time,

[0039] Add NaOH template agent whose particle size distribution is 1-2nm, medium particle 5-50nm, large particle 60-100nm, ethanol and mix thoroughly, then evaporate to dryness at a low temperature of 50-60°C to obtain the precursor;

[0040] 2. Put the prepared precursor under the protective atmosphere of ammonia gas, first according to the heating system of 5-10°C / min,

[0041] Heating to 200°C, constant temperature for 2 hours, then heating to 600°C at a heating rate of 1-5°C / min, constant temperature for 2 hours; then cooling with the furnace; the core-shell material of the three-dimensional hierarchical hole shell coated with micropores is obtained The pore size distribution of the micropores is as follows: the pore size of the macropore is 50-120nm, the pore size of the medium pore is 3-50nm, and the pore size of the small pore is less than 2nm.

[004...

Embodiment 2

[0056] 1. The proportion of natural graphite and coal tar with nano-sized surface is 3:1 by weight, and at the same time, SiO with particle size distribution of 1-2nm, medium-sized 5-50nm, and large-sized 60-100nm is added. 2 After the template agent and acetone are fully mixed, evaporate to dryness at a low temperature of 70-80 °C to obtain the precursor;

[0057] 2. Under the protective atmosphere of nitrogen and hydrogen (nitrogen: hydrogen = 1:1), the prepared precursor is first heated to 300 °C at a temperature of 5-10 °C / min, kept at a constant temperature for 3 hours, and then press 1-5 °C. The heating system of ℃ / min is heated to 700 ℃, and the constant temperature is 6 hours; then it is cooled with the furnace; the core-shell material is obtained with a three-dimensional hierarchical pore shell covered with micropores on the core material; the pore size distribution of the micropores is: 50-120nm, the mesopore diameter is 3-50nm, and the small pore diameter is less th...

Embodiment 3

[0071] 1. The natural graphite with the surface nano-sized and the pitch are batched in a ratio of 10:1 by weight, and at the same time, Ni(OH) with a particle size distribution of 1-2nm, medium-sized 5-50nm, and large-sized 60-100nm is added. 2 After the template agent and methanol are fully mixed, they are evaporated to dryness at a low temperature of 90-100 °C to obtain the precursor;

[0072] 2. The prepared precursor is heated to 400°C at a temperature of 5-10°C / min under an argon protective atmosphere for 5 hours, and then heated to 800°C at a temperature of 1-5°C / min. , at a constant temperature of 10h; then cooled with the furnace; a core-shell material with a three-dimensional hierarchical pore shell covered with micropores is obtained on the core material; 50nm, the pore diameter is less than 2nm.

[0073] 3. Removal of template agent: use dilute nitric acid to remove Ni(OH) on carbonized precursor at room temperature 2 templating agent;

[0074] 4. The precursor ...

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Abstract

The invention relates to a high-rate lithium-ion battery and a method for preparing a composite carbon cathode material for a super-capacitor battery. The method comprises the following steps: coating a surface-nano-crystallized core with a porous carbon coat provided with macro-pore / meso-pore / micro-pore three-dimensional layer pores; doping metal particles on the surface of the coat; and carrying out low-potential treatment, wherein the three steps are sequentially achieved by a template-based method, a combined method comprising dipping, chemical plating and physical mixing, and an electrochemical method of lithium pre-doping respectively. The process of the invention has the advantages of simple method and convenient operation; the prepared material has a core-coat structure and doped metallic elements, and meanwhile, the material has good performance in double-layer electric energy storage and lithium-ion intercalation and de-intercalation energy storage and effectively improves the high-rate performance and power density of the lithium-ion battery; the material meets the requirements of super-capacitor batteries in both the lithium-ion energy storage and double-layer electricenergy storage of the cathode material; accordingly, the material can be used as the cathode of a high-performance lithium-ion battery; and the material has good performance in high-rate charging / discharging, so the material has a good prospect for industrialization.

Description

technical field [0001] The invention discloses a method for preparing a carbon-based composite negative electrode material for a supercapacitor battery; in particular, it refers to the preparation of a carbon-based composite negative electrode material for a supercapacitor battery that can be charged and discharged at a large rate and has high power density and high energy density method. 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...

Claims

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Application Information

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