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Cathode material for alkaline secondary zinc electrode and its preparing method

A negative electrode material, secondary zinc technology, applied in the direction of alkaline battery electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of low charge acceptance, short cycle life, unstable capacity, etc., to reduce and prevent zinc dendrites, The effect of improving cycle life, improving utilization rate and discharge capacity

Inactive Publication Date: 2007-06-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the secondary zinc electrode made of the negative electrode material of the alkaline secondary zinc electrode in the prior art, such as low utilization rate of active material, poor conductivity, low charge acceptance, unstable capacity, and short cycle life, the present invention provides a An alkaline secondary zinc electrode negative electrode material, the secondary zinc electrode active material made of the negative electrode material has high utilization rate, good conductivity, high charge acceptance, stable capacity and long cycle life. The invention also provides the The preparation method of negative electrode material

Method used

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  • Cathode material for alkaline secondary zinc electrode and its preparing method
  • Cathode material for alkaline secondary zinc electrode and its preparing method
  • Cathode material for alkaline secondary zinc electrode and its preparing method

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Embodiment 1

[0018] A negative electrode material for an alkaline secondary zinc electrode, which uses a zinc oxide-based conductive oxide as the inner core, and the inner core is uniformly coated with nanometer zinc oxide particles, and the chemical composition of the zinc oxide-based conductive oxide is: 92 Parts by weight of ZnO, 5.5 parts by weight of Bi 2 o 3 , 2.5 parts by weight of Co 2 o 3 , 0.075 parts by weight of Nb 2 o 5 , 0.025 parts by weight Y 2 o 3 .

[0019] Zinc nitrate is used as raw material, ammonia water and urea are used as precipitating agent, zinc nitrate and urea are respectively dissolved in distilled water, after completely dissolving, the two are mixed, and then the zinc oxide-based conductive oxide is added into the solution, which consists of 92 parts by weight of ZnO, 5.5 parts by weight of Bi 2 o 3 , 2.4 parts by weight of Co 2 o 3 , 0.075 parts by weight of Nb 2 o 5 , 0.025 parts by weight Y 2 o 3 , and its room temperature resistivity is ab...

Embodiment 2

[0028] A negative electrode material for an alkaline secondary zinc electrode, with a zinc oxide-based conductive oxide as the inner core, and nano-zinc oxide particles are uniformly wrapped outside the inner core, and the chemical composition of the zinc oxide-based conductive oxide is: 95 Parts by weight of ZnO; 5 parts by weight of Co 2 o 3 .

[0029] Zinc nitrate is used as raw material, ammonia water and urea are used as precipitating agent, zinc nitrate and urea are respectively dissolved in distilled water, after completely dissolving, the two are mixed, and then the zinc oxide-based conductive oxide is added into the solution, which consists of 95 parts by weight of ZnO, 5 parts by weight of Co 2 o 3 , the mass ratio of the zinc oxide-based conductive oxide to the zinc nitrate is 1:59. Heat to 120° C. with ultrasonic stirring and keep warm for 2 hours. After cooling, filter, wash the precipitate with distilled water and ethanol, and then dry at 120°C for 1 hour to...

Embodiment 3

[0034] A negative electrode material for an alkaline secondary zinc electrode, with a zinc oxide-based conductive oxide as the inner core, and nanometer zinc oxide particles are evenly wrapped outside the inner core, and the chemical composition of the zinc oxide-based conductive oxide is: 98 Parts by weight of ZnO; 2 parts by weight of Co 2 o 3 .

[0035] Zinc nitrate is used as raw material, ammonia water and urea are used as precipitating agent, zinc nitrate and urea are respectively dissolved in distilled water, after completely dissolving, the two are mixed, and then the zinc oxide-based conductive oxide is added into the solution, which consists of 98 parts by weight of ZnO, 2 parts by weight of Co 2 o 3 , the mass ratio of the zinc oxide-based conductive oxide to the zinc nitrate is 1:40. Heat to 90°C with ultrasonic stirring and keep warm for 3 hours. After cooling, filter, wash the precipitate with distilled water and ethanol, and then dry at 100°C for 3 hours to...

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Abstract

Conducting oxide based on zinc oxide is as kernel. Nano grains of zinc oxide wrap outside kernel evenly. Primary chemical composition of the zinc oxide based conducting oxide is ZnO and CO2O3. The said zinc oxide based conducting oxide can also be conducting oxides of containing Bi2O3, Co2O3, La2O3 etc. Method of deposition in homogeneous phase is adopted to prepare the disclosed material for cathode. Advantages are: (1) being added to zinc electrode, the zinc oxide based conducting oxide can be as center of crystallization; increasing use ratio of active material and discharge capacity, and reducing and preventing generation of tree like crystal of zinc, and raising cycle life of electrode; (2) reducing internal resistance of electrode. The invention possesses favorable effect for improving synthetical electrochemical performance of secondary zinc electrode.

Description

(1) Technical field [0001] The invention relates to a negative electrode material of an alkaline secondary zinc battery and a preparation method thereof. (2) Background technology [0002] Zinc-nickel battery is a novel high-energy secondary battery developed in recent years. It uses zinc as the negative electrode and nickel hydroxide as the positive electrode. It has high specific energy (326Wh / kg in theory, not less than 115Wh / kg in practice). , high current discharge (more than 200W / kg specific power), high working voltage (average 1.65V), stable discharge, low cost, no environmental pollution and other outstanding advantages. It is a new type of environmentally friendly power battery with a wide range of applications and development prospects. Other types of alkaline secondary zinc batteries also have broad application prospects. [0003] Due to the high electrochemical activity of zinc in alkaline solution, unstable thermodynamic properties, and the high solubility of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/04H01M4/26H01M4/62
CPCY02E60/124Y02E60/10
Inventor 张文魁涂江平黄辉甘永平
Owner ZHEJIANG UNIV OF TECH
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