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Load type ferrate electrode active material and method of manufacturing the same

An electrode active material, ferrate technology, applied in capacitor electrodes, alkaline battery electrodes, hybrid capacitor electrodes, etc., can solve the problems of reducing electrode discharge performance, loss of electrode active materials, affecting normal use of electrodes, etc., and achieve service life. Long, high rate discharge performance, simple and practical effect of preparation method

Inactive Publication Date: 2009-02-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high solubility of most ferrates in alkaline aqueous solution (only a few ferrates such as barium ferrate have low solubility), it is easy to cause the loss of electrode active materials when ferrate is used as an electrode material. The adverse consequence is that it will not only greatly reduce the discharge performance of the electrode, but also cause a self-discharge phenomenon that is seriously harmful to the electrochemical system and affect the normal use of the electrode.

Method used

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Examples

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Effect test

Embodiment 1

[0013] Example 1: Potassium ferrate is dissolved in an aqueous solution with a concentration of 9MKOH at 20-25°C to obtain a saturated solution of potassium ferrate; Soak 0.512ml / g of activated carbon in 500ml of potassium ferrate saturated solution, the mass ratio of potassium ferrate to activated carbon is 6:1; stir slowly for 24 hours; after filtration and separation, wash the separated solid with KOH solution with a concentration of 9M 1 time, washed 3 times with isopropanol, and dried naturally to obtain an electrode active material supported by activated carbon with potassium ferrate. Weigh 0.475g of the electrode active material and 0.025g of polytetrafluoroethylene powder, and mix evenly; add 1ml of isopropanol and stir until it becomes a paste; roll repeatedly on a smooth stainless steel plate with a smooth stainless steel roller to form a film with a thickness of 0.05mm And cut into a thin slice with a diameter of 8mm; put this thin slice and a nickel foam disc with ...

Embodiment 2

[0014] Example 2: Sodium ferrate was dissolved in 13M KOH aqueous solution at 20-25°C to obtain a saturated solution of potassium ferrate; Soak 0.725ml / g graphite in 500ml sodium ferrate saturated solution, the mass ratio of sodium ferrate to graphite is 10:1; stir slowly for 24 hours; filter and separate the separated solid with KOH solution with a concentration of 13M Washing twice, washing three times with isopropanol; and drying naturally to obtain an electrode active material supported by graphite with sodium ferrate. The electrode active material can be made into a sodium ferrate electrode by the same method as in Example 1. The electrode was assembled into Na 2 FeO 4 / Z Alkaline n-alkaline primary battery, the experimental results show that the battery's 2C rate current discharge capacity can reach more than 80% of the 0.2C rate current discharge capacity at room temperature.

Embodiment 3

[0015] Example 3: Lithium ferrate was dissolved in KOH aqueous solution with a concentration of 6M at 20-25°C to obtain a saturated solution of lithium ferrate; 1.012ml / g high-activity mesophase carbon microspheres, soaked in 500ml lithium ferrate saturated solution, the mass ratio of lithium ferrate and high-activity mesophase carbon microspheres is 6:1; stir slowly for 24 hours; filter and separate The separated solid was washed 3 times with 6M KOH solution and 3 times with isopropanol; and dried naturally to obtain an electrode active material with high activity mesophase carbon microspheres loaded with lithium ferrate. The electrode active material can be made into a lithium ferrate electrode by the same method as in Example 1. The electrode was assembled into a Li 2 FeO 4 / Zn alkaline primary battery, the experimental results show that the specific capacity of the electrode can reach more than 500mAh / g.

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PUM

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Abstract

A load type ferrate electrode active material is prepared by a microporous adsorbate using granular carbon-based material having micropores as a carrier and using ferrate as the granular carbon-based material, and the preparation steps are as follows: 1) the ferrate is dissolved in KOH aqueous solution to obtain potassium ferrate saturated solution; 2) the granular carbon-based material having micropores is dipped in the solution; 3) slow stirring has been carried out for 10-24 hours, ensuring the carbon-based material to fully absorb the ferrate; 4) KOH aqueous solution and isopropanol are respectively used for washing after filtering, naturally drying. The invention has the following advantages: the electrode manufactured by the electrode active material can avoid the ferrate to be dissolved in electrolyte solution, having lower self-discharge rate, higher rate discharge performance and long service life; the preparation method is simple and practical and has lower cost, which can be widely applied to manufacturing alkaline primary batteries, secondary batteries and super-capacitors as a new electrode active material.

Description

(1) Technical field [0001] The invention relates to the manufacturing technology of alkaline battery electrode materials, in particular to a loaded ferrate electrode active material and a preparation method thereof. (2) Background technology [0002] The study of ferrate as an electrode material is a relatively new topic, which has received more and more attention worldwide. The research on the electrochemical performance of ferrate electrode materials mainly involves two different systems: one is an alkaline aqueous solution system, and the other is a non-aqueous medium system. In the alkaline aqueous solution medium system, Fe in ferrate is +6 valence, which involves 3e transfer when participating in the discharge reaction, so ferrate has a high specific capacity, and can be used as an electrode material in alkaline primary batteries, secondary batteries, etc. Batteries and supercapacitors, etc.; especially its final form after discharge in alkaline aqueous solution is Fe...

Claims

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Application Information

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IPC IPC(8): H01M4/24H01M4/28H01G9/04H01G9/058H01G11/34H01G11/86
CPCY02E60/124Y02E60/13Y02E60/10
Inventor 叶世海王永龙王妍妍曹建胜孙秋丽吴玉菊
Owner NANKAI UNIV
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