Foam-metal current collector of secondary battery using zinc as negative electrode and its preparing process

A foam metal and secondary battery technology, applied in the direction of electrode manufacturing, electrode carrier/collector, etc., can solve the problems of expensive, restricting the popularization and use of zinc-nickel batteries, and unable to replace silver, etc., achieve low cost, and inhibit the growth of dendrites , the effect of excellent performance

Inactive Publication Date: 2004-10-20
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now relatively good zinc-nickel batteries use precious metal silver as the current collector (substrate). Current research shows that common elemental metals cannot replace silver as the current collector (substrate) of zinc-nickel batteries.
The high price of silver severely limits the popularization and use of zinc-nickel batteries. Therefore, finding a new type of current collector (substrate) with low price, better performance and stronger practicality is the basis and basis for the practical application of zinc-nickel batteries. The essential

Method used

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  • Foam-metal current collector of secondary battery using zinc as negative electrode and its preparing process
  • Foam-metal current collector of secondary battery using zinc as negative electrode and its preparing process
  • Foam-metal current collector of secondary battery using zinc as negative electrode and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 The foamed plastic sheet of thick 2mm is about 10cm 2 SnCl 2 Sensitization, silver ammonia complex solution activation, put 250ml10g / lCuSO 4 .5H 2 O + 30g / l EDTA (ethylenediaminetetraacetic acid) + 5ml / l methanol, pH value of 12.5 solution, constant temperature to 35 ℃, under the stirring condition of about 200 rpm, dropwise add 1.5gNiCl 2 .6H 2 O solution and 5ml formaldehyde, react for about 1 hour, take out the foamed plastic sheet through electroless copper plating, clean, dry. The electroless copper-plated foam plastic sheet was placed in a tube resistance furnace and heated with Ar+H 2 Protected by mixed gas, the temperature was raised to 750°C and cooled to obtain foamed copper. Use foamed copper as the cathode, placed in 225g / lCuSO 4 .5H 2 O+60g / lH 2 SO 4 In the electroplating solution of +35g / l glucose, the copper sheet is used as the anode, stirred at a speed of about 80 rpm, and the cathode current density is 60mA / cm 2 (for apparent are...

Embodiment 2

[0020] The foamed brass prepared in Example 1 was used as a current collector (matrix), and electroplated with zinc in a saturated zincate solution to prepare a zinc electrode. First degrease in acetone for 5min, then at 20mA / cm 2 Under current density, cathodic polarization was performed in 5M KOH solution for 1 min. Finally, in a saturated zincate solution with a current density of I = 100mA / cm 2 , electroplating time t = 10min, electroplating temperature T = 40 ℃ conditions electroplating zinc. The current collectors of Cu, Ni, In, Ag, and Zn were galvanized by the same method, and compared with electrochemical performance tests. The obtained data are listed in Table 1, as can be seen from Table 1:

[0021] Collector (base

quality)

E. corr (base

quality) / V

E. corr / V

i corr / mA / cm 2

b a / mV

E. p / V

Ni

-0.960

-1.362

5.976

40.7

-1.281

Zn

-1.374

...

Embodiment 3

[0029] The brass foam prepared in Example 1 and the brass mesh and nickel foam commonly used in secondary batteries (matrix) were compared to study the dendrite growth of zinc electrodes using them as current collectors (matrix). In a saturated zincate solution, an overpotential of -100mV was applied to three current collectors (substrates) of foamed brass, brass mesh and foamed nickel, and the constant potential was polarized for 4500 seconds. When dendrites grow, the surface area of ​​the zinc electrode will be greatly increased, thereby increasing the total current of the zinc electrode. The growth of zinc dendrites on the current collector (substrate) is judged according to the growth rate of the total current. The total current increase and growth rate of the zinc electrode of the three current collectors (substrates) are shown in Table 2.

[0030] foam brass

[0031] Zinc electrodes will produce dendrites during the charging process, and the growth of dendri...

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Abstract

The invention relates to a method for preparing foam metal current collector (substrate) of new type secondary battery that uses zinc as negative pole. It possesses foamy space structure whose space cellular structure in three dimension is composed of metal framework connected eath other. Its surface ingredient includes copper 68%-75% (Wt), zinc 32-25%, that is copper-zinc alloy or foamy brass. The collector (substrate) being as zinc pole has very good performance in electrochemistry and better circular performance. The invention possesses merits of stable characteristic, low cost, simple technique, lower relative density, good electrical conductivity etc. The invention is particularly suitable for zinc-nickel secondary battery, also other zinc based secondary battery and alkaline secondary battery.

Description

Technical field [0001] The invention relates to a secondary battery, in particular to the preparation of a novel foamed brass current collector (matrix) for the secondary battery with zinc as the negative electrode. Background technique [0002] With the development of social economy and the improvement of environmental awareness, people increasingly need a power source with high specific energy, high power, low price and no pollution in the new century. Zinc-nickel secondary batteries can just meet people's needs, so zinc-nickel secondary batteries have become a hot spot for research and development again. [0003] Compared with nickel-metal hydride, nickel-cadmium, and lead-acid batteries, zinc-nickel batteries have outstanding advantages: (1) high specific energy (theoretical value 326Wh / kg, actual value ≥ 75Wh / kg); (2) high specific power (≥ 200W / kg); (3) Wide working temperature range (-20℃~60℃); (4) High working voltage (1.65V); (5) High charging and discharging effic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/64
CPCY02E60/12Y02E60/10
Inventor 杨化滨杨恩东冀惊涛孙华周作祥袁华堂
Owner NANKAI UNIV
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