Activated iron electrode

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...

AI Technical Summary

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 electrode is easy to passivate

4. Low utilization rate of active substances

The active material utilization of ordinary iron electrodes is generally between 10% and 15%, which greatly limits the improvement of battery specific energy

5. The electrode working voltage is low

These batteries are not only difficult to meet the requirements of environmental protection, but also the application fields are greatly limited

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