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Negative electrode material for alkaline secondary zinc electrode

A negative electrode material, zinc electrode technology, applied in alkaline batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of calcium zincate not seen, long reaction time, etc., achieve small particle size, prolong life, and high electrochemical activity Effect

Inactive Publication Date: 2005-03-16
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of using this method are: multi-step reaction, long reaction time, and the synthesized product must be thoroughly washed, dried after removing potassium hydroxide, etc.
Although it has been discussed above that there are many electrode additives for zinc secondary electrodes (the active material is zinc oxide or zinc), there are no reports about the additives in calcium zincate.

Method used

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  • Negative electrode material for alkaline secondary zinc electrode
  • Negative electrode material for alkaline secondary zinc electrode
  • Negative electrode material for alkaline secondary zinc electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Synthesis of calcium zincate by high-energy ball milling

[0035] What the present invention used was the Fritsch P-6 planetary ball mill produced in Germany, and the main technical parameters are:

[0036] (1) Ball mill jar: made of stainless steel, 250ml

[0037] (2) Ball: made of stainless steel, there are two specifications: φ10mm (4g / piece) and φ20mm (32g / piece)

[0038] (3) Speed: 100~600 rpm

[0039] (4) Others: There are two ventilation holes on the lid of the tank, through which various gases can be introduced to control the atmosphere of the ball mill

[0040] Put 18.5 grams of 200-300 mesh calcium hydroxide powder and 40.5 grams of 200-300 mesh zinc oxide powder into the ball mill jar, and then add 18-20 grams of distilled water. According to the mass ratio of the ball to the material of 4:1, the quality of adding large (4) and small (47) stainless steel balls is 316 grams in total, and under the protection of argon, carry out solid phase syn...

Embodiment 2

[0042] 8 grams of 200-300 mesh calcium zincate, 0.8 grams of 200-300 mesh graphite powder and 0.10 grams of 200-300 mesh nano-titanium dioxide are mixed, bonded with polytetrafluoroethylene, and then the mixture is filled into the pores of foamed brass , After drying, press the two sides of the brass mesh current collector with a pressure of 20MPa, and the total thickness of the electrode is 2-3mm. Soak the zinc electrode in a 3.8 mol / l KOH solution containing saturated ZnO, and apply an overpotential of -200mV to the zinc electrode through a potentiostat (UK Solartron 1287). Under such conditions, the cathode is polarized for 3500 seconds, and the change of the current intensity with time before and after polarization (ie, the i~t curve) is observed, so as to judge the condition of the electrodeposited zinc. If the deposited zinc is relatively uniform and dense, it will not cause changes in the real surface area of ​​the zinc electrode, and the current through the zinc electr...

Embodiment 3

[0044] 8 grams of 200-300 mesh calcium zincate, 0.8 grams of 200-300 mesh graphite powder and 0.10 grams of 200-300 mesh lanthanum trioxide are mixed, bonded with polytetrafluoroethylene, and then filled into the holes of foamed brass , After drying, press the two sides of the brass mesh current collector with a pressure of 20MPa, and the total thickness of the electrode is 2-3mm. Soak the zinc electrode in a 3.8 mol / l KOH solution containing saturated ZnO, and apply an overpotential of -200mV to the zinc electrode through a potentiostat (UK Solartron 1287). Under such conditions, the cathode was polarized for 600 seconds, and then the condition of the electrodeposited zinc was judged by SEM observation. Figure 5 It is a scanning electron micrograph (30 μm) of a calcium zincate electrode without adding dilanthanum trioxide. Figure 6 It is a scanning electron micrograph (30 μm) of a calcium zincate electrode added with dilanthanum trioxide. It can be seen that the zinc afte...

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Abstract

The invention relates to negative electrode material for alkaline secondary zinc electrode , including calcium carbonate and millimicron oxide, the millimicron oxidation is transition metal or rare earth oxide. The mass percentage of calcium carbonate and millimicron oxide is: 80-98%, 2-20%, ratio of material is according to calcium carbonate [Ca(OH)2 .Zn(OH)2.XH2O(x=2,3)], in the condition of 150~500r / m and ratio of 3~20:1, by the protection of argon gas, calcium carbonate is formed by the mixture of calcium hydroxide(or calcium oxide), zinc hydroxide (or zinc oxide) and water after 5~25 hours. The invention has low cost, excellent property and no pollution, and multi-hole alkaline secondary zinc electrode made by mixture of calcium carbonate and millimicron oxide has better performance of discharge, suitable for various chargeable alkaline battery of Zn / Ni, Zn / Ag and Zn / Mn using Zn as negative electrode .

Description

technical field [0001] The invention relates to the preparation of negative electrodes of alkaline secondary batteries, in particular to negative electrode materials for alkaline secondary zinc electrodes. Background technique [0002] Alkaline secondary batteries with zinc as the negative electrode, such as zinc / nickel, zinc / silver, zinc / manganese and other secondary batteries, due to their high specific energy, high specific power, high reliability and safety, low cost and no environment Compared with other alkaline secondary batteries, it is an ideal green power source. Therefore, the alkaline secondary battery with zinc as the negative electrode has always been a focus of people's development and research. However, the main problem currently limiting the practical application of this type of battery is the short lifetime of the zinc electrode, especially under deep discharge conditions. The reason is that the discharge product of zinc electrode has a high solubility in...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/48H01M10/24
CPCY02E60/124Y02E60/10
Inventor 杨化滨周作祥王晓丹孟宪玲张海昌
Owner NANKAI UNIV
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