Preparing method of high potential super capacitor electrode material

A technology for supercapacitors and electrode materials, applied in the field of materials and energy, which can solve the problems of poor performance, low tap density, and low working potential of supercapacitors, and achieve the effects of improved performance, low equipment requirements, and reduced energy consumption

Inactive Publication Date: 2010-12-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the current shortcomings of poor performance of supercapacitors due to low tap density and low working potential of carbon materials. Starting from the synthesis route and process, the supercapacitor can be improved by increasing the tap density and working potential of carbon materials. Capacitance and working potential of capacitors, thereby improving the energy characteristics and power characteristics of supercapacitors, and promoting the wide application of supercapacitors

Method used

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  • Preparing method of high potential super capacitor electrode material
  • Preparing method of high potential super capacitor electrode material
  • Preparing method of high potential super capacitor electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using the rheological phase reaction method, the by-product phosphorus iron Fe of phosphorus chemical industry 1.5 P is iron source and part of phosphorus source, adding a certain amount of NH 4 h 2 PO 4 Supplement the phosphorus source with LiOH·H 2 O and Li 2 CO 3 To mix the lithium source, add ethanol and a certain amount of activated carbon (specific surface area > 100m 2 / g), the precursor is fully ground into a rheological phase, and after low-temperature pretreatment, it is placed in a muffle furnace at 400-900°C for 5-40 hours, and the oxygen in the air is used as the oxygen source to oxidize the carbon burned by C The substance is an inert protective gas, and the black C / LiFePO 4 Electrode material, relatively fluffy, prepared spherical LiFePO 4 Distributed in fine carbon particles, its appearance is as figure 1 shown.

[0026] The prepared above C / LiFePO 4 Electrode material, conductive acetylene black and binder are fully mixed according to the mass...

Embodiment 2

[0028] Using the sol-gel method, Fe(NO 3 ) 3 9H 2 O is iron source, LiH 2 PO 4 For lithium source and phosphorus source, add a certain amount of polyvinyl alcohol, ethanol and water, fully stir at 20-90°C until a viscous colloid is formed, and after further low-temperature pretreatment, put it into a controlled atmosphere tube at 400-900°C Roasting in a type furnace for 5 to 40 hours, using H 2 For the protective gas, the black C / LiFePO was finally obtained 4 electrode material.

[0029] Using the prepared material as the working electrode, the electrochemical performance test is the same as in Example 1, and the working potential can reach 4.6V. The prepared C / LiFePO 4 The electrode material has good cycle performance, and the cycle performance at 2C is as follows: image 3 As shown, there is no capacity fading after 500 cycles.

Embodiment 3

[0031] Using the reaction pulverization method, FeP was used as the source of iron and phosphorus, and Li 3 PO 4 Lithium source, the ratio of the two substances is 2:1, add a certain amount of sucrose, after high-energy ball milling for 15 hours, put it into a controlled atmosphere tube furnace at 200-800 ° C for 0.5-10 hours to roast. N 2 As an inert protective gas, using oxygen in sucrose as an oxygen source, using the material formation process to carbonize sucrose to obtain black C / Li with controllable carbon content 3 Fe 2 (PO 4 ) 3 electrode material.

[0032] Using the prepared material as the working electrode, the electrochemical performance test is the same as in Example 1, the working potential can reach 4.0V, the stable specific capacitance at 50C can reach 90F / g, and the capacity retention rate after 500 cycles is 96%.

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Abstract

The invention relates to a high potential supercapacitor electrode material and a preparation method thereof, and belongs to the material and energy resource filed. The supercapacitor electrode material contains elements of C, Fe and P, the mass content of C is less than 10 percent, and other elements can be added as required. The working potential relative to Li<plus>Li can reach 4.3V and has good circulation stability. A matter containing C is added to a precursor, and the forming process of the material is utilized to synthesize and prepare the supercapacitor electrode material. The supercapacitor electrode material contains the elements of C, Fe and P, and can improve the compaction density of the C material and the working potential of the supercapacitor, thereby improving the capacity, the energy response and the power characteristics of the supercapacitor. Compared with the prior art, the method is convenient to operate, and the preparation process is simple and practical. The performance of the supercapacitor can be improved through the improvement of the compaction density and the working potential of the electrode material.

Description

technical field [0001] The invention relates to a high-potential supercapacitor electrode material and a preparation method thereof, in particular to a preparation method of a supercapacitor electrode material containing C, Fe and P at the same time, and belongs to the field of materials and energy. Background technique [0002] Supercapacitors (Supercapacitors or Super Capacitors or Ultra Capacitors), also known as ultra-large capacity capacitors or electrochemical capacitors, commercial names are also known as (gold) capacitors (Gold Capacitors), energy storage capacitors or farad capacitors. With the breakthrough of material science and the development of electronic products, a new type of power electronic components has emerged and developed rapidly. It mainly includes electric double-layer capacitors and Faraday pseudo-capacitance capacitors. The two electrodes do not form a hybrid capacitor at the same time. In the energy diagram, it fills the gap between traditional c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01G9/058H01G11/30H01G11/86
CPCY02E60/13
Inventor 王贵欣闫康平王飞刘睿李秀丽
Owner SICHUAN UNIV
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