Zinc electrode material for secondary battery using Zn as negative electrode and its preparing process

A secondary battery, zinc electrode technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of inability to comprehensively improve the performance of zinc electrodes, limit the practical application of secondary batteries, expensive zinc electrode costs, etc., to improve zinc deposition. performance, reducing corrosion current density, and improving performance

Inactive Publication Date: 2003-02-12
NANKAI UNIV
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

However, experiments have shown that these zinc alloy electrode materials can only improve the performance of zinc electrodes from one or several aspects, and cannot fully improve the performance of zinc electrodes; in addition, the expensive prices of Bi and In also increase the cost of zinc electrodes, which severely limits the performance of zinc electrodes. The practical application of zinc-nickel batteries and other secondary batteries with zinc as the negative electrode

Method used

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  • Zinc electrode material for secondary battery using Zn as negative electrode and its preparing process
  • Zinc electrode material for secondary battery using Zn as negative electrode and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of Zn by solid phase diffusion method 100-x La x alloy. Mix the Zn and La metal powders over 300 mesh evenly according to the stoichiometric ratio (where x=0.1, 1), grind for 4 hours, put them into a special mold, and press them into an ingot under a pressure of 30 MPa. Then put the metal ingot into a stainless steel reactor, fill it with 5MPa high-purity Ar gas, seal the reactor, put it into a tube furnace, heat it to 370°C, diffuse it for 8 hours to form an alloy, and then cool it naturally After reaching room temperature, the obtained product was mechanically pulverized and set aside.

Embodiment 2

[0018] Preparation of Zn by solid phase diffusion method 100-x Mmm x Alloy (Mm is lanthanum-rich mixed rare earth, the percentages of main elements are: La: 51.38%; Ce: 28.32%; Pr: 3.92%; Nd: 16.38%). Weigh 300-mesh Zn and Mm metal powders (where x=0.1, 1) according to the formulated alloy composition, mix them evenly, grind them with an agate mortar for 5 hours, and press the ground powders into circular pieces under a pressure of 25 MPa , and then sealed in a stainless steel container, after vacuuming and gas washing, filled with 7.5MPa high-purity Ar gas, put the stainless steel container into a tubular resistance furnace, heated to 420 ° C, and diffused at a constant temperature for 10 hours to make it in solid state Diffusion in the phase to form an alloy, naturally cooled to room temperature, mechanically crushing the obtained alloy, and set aside.

Embodiment 3

[0020] The alloy prepared in Example 1 was prepared into an as-cast electrode, and the electrochemical performance test was carried out in a 5M KOH solution, and compared with a pure Zn electrode, the obtained corrosion curve is shown in Figure 1, and the data are shown in Table 1:

[0021] Table 1 Zn 100-x La x Potentiostatic Polarization Curve Parameters of Alloy Electrode and Pure Zn Electrode

[0022] Alloy

i corr / mA / cm 2

b a / mV

b c / mV

η / V(0.02A / cm 2 )

 p / V

Zn

3.89

45

128

0.088

-1.256

Zn 100-x La x

0.81

36

162

0.214

-1.253

[0023] Note: i corr is the corrosion current density; b a is the anode Tafel slope; b c is the cathode Tafel slope; η is the hydrogen evolution overpotential;

[0024]  p passivating potential

[0025] From Figure 1 and Table 1, it can be seen that compared with pure Zn electrodes, Zn ...

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Abstract

A Zn electrode material used as the negative electrode of secondary battery has its chemical formula: Zn100-xMx, where M is one or more kinds of La, Ce, Pu, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yband Lu, and X=0.1-50. Its advantages are excellent electrochemical performance, high discharge capacity, long cyclic life, low cost and no pollution.

Description

Technical field [0001] The invention relates to an alkaline secondary battery, in particular to the preparation of a novel zinc electrode material for a 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, and zinc-nickel secondary batteries can just meet people's needs , thus zinc-nickel secondary battery has become a research and development hotspot 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 efficiency (≥8...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/42
CPCY02E60/10
Inventor 杨化滨杨恩东王晓丹孟宪玲张海昌周作祥袁华堂
Owner NANKAI UNIV
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