Activated iron electrode

An iron electrode, activation type technology, applied in the field of electrodes, can solve the problems of low electrode charging efficiency, limited battery specific energy, limited application field, etc., and achieve the effects of inhibiting the self-discharge of iron, simple manufacturing process, and prolonging shelf life.

Inactive Publication Date: 2004-09-29
张勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently used iron electrode materials have the following disadvantages: 1. The electrode charging efficiency is low
In alkaline solution, due to the low hydrogen overpotential of iron, in Fe 2+ In the -Fe stage, about 50% of the charging current will be consumed by the generation of H2, and the Coulombic efficiency is low, and its charging efficiency is low
2. High self-discharge
3. The elect

Method used

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Embodiment Construction

[0019] The embodiment of the iron electrode of the present invention adopts reduced iron powder, ferrite (after sintering), and Al-Sn-Ga alloy powder to be mixed in a ratio of 65:34:1, and sublimed sulfur and graphite powder are added, and NMP (N-picoline ) Dissolve PVDF (polyvinylidene fluoride) as a binder, make an iron electrode by paste method, dry it, and press it into an area of ​​4cm 2 Iron electrode 1, using vinylon non-woven fabric as battery separator 2, using 6M KOH as electrolyte 3, adding a small amount of organic corrosion inhibitor such as NBL-16 (0.1-0.2g / L) or polyoxyethylene dodecane Esters (0.3-3g / L), etc., can also add a little water glass or inorganic inhibitors such as sodium phosphate; the iron electrode and the nickel electrode 4 in the nickel-metal hydride battery are used to form a battery, and the battery is charged and discharged. test. This embodiment makes battery, at 10mA / cm 2 Discharge under the current density, the specific energy of the iron ...

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Abstract

An activated ferroelectrode characterizes in mixing an Al-Sn-Ga alloy in it among which, Al is 0-10% of its weight, Sn is 0.2%-5% and Ga is 0.01%-0.75%. Advantages: 1. The ferroelectrode can be activated not adding harmful heavy metals (Hg, Cd and Pb etc.) and has long circulation life, 2. it can discharge large current and is not passivated, 3. High potential, 4. High usability of the active material is used to make high-energy batteries, 5. Self-discharge is suppressed to reduce 30% per month, one time lower than of traditional ones, 6. Simple process technology at low cost. Al addition not only increases surface of its ratio, but also suppresses the self discharge.

Description

[0001] Field: [0002] The invention belongs to an electrode, in particular to an activated iron electrode. Background technique: [0003] Iron as a battery anode material has a very long charge and discharge life, and does not produce dendrites when charging; the electrochemical equivalent is 0.6947 / g (Ah) -1 , has potential conditions for making high-energy batteries; wide range of raw materials and low prices. However, the currently used iron electrode materials have the following disadvantages: 1. The electrode charging efficiency is low. In alkaline solution, due to the low hydrogen overpotential of iron, in Fe 2+ In the -Fe stage, about 50% of the charging current will be consumed by the generation of H2, and the Coulombic efficiency is low, and its charging efficiency is low. 2. High self-discharge. When the iron electrode is left alone, H2 occurs on the iron electrode, forming a corrosion cell and causing the iron electrode to self-discharge. Ordinary iron electro...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36
CPCY02E60/10
Inventor 张勇
Owner 张勇
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