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an alkaline battery

An alkaline battery and alkaline technology, applied in the manufacture of alkaline batteries, alkaline battery electrodes, alkaline batteries, etc., can solve the problems of particle agglomeration specific surface area, low reaction discharge capacity, large particle size, etc., and achieve specific surface area High, easy to handle, low cost effect

Active Publication Date: 2011-12-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low reaction discharge capacity and poor cycle performance in alkaline batteries in the prior art due to the large particle size, wide particle size distribution, particle agglomeration phenomenon and generally low specific surface area of ​​the negative electrode material boride, the purpose of the present invention lies in the provision of an alkaline battery

Method used

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Examples

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Embodiment 1

[0039] Place the reactor in an environment of 4°C, under the stirring condition of a magnetic stirrer, add 0.1mol / L, 100mL of CoCl 2 The solution was added to the reactor. Then, at a rate of 1 mL / min, add excess NaBH with NaOH to adjust the pH value to 12 dropwise. 4 Solution (0.5mol / L, 100mL), continued to stir for 0.5h after the dropwise addition to ensure complete reaction, and precipitate 1 was obtained. The obtained precipitate 1 was washed three times with deionized water and then suction-filtered to obtain precipitate 2. Put the precipitate 2 into a cold trap, drop to -90°C together with the cold trap, and freeze at -90°C for 3 hours at a cooling rate of 15°C / min. After freezing, vacuumize to sublimate the liquid in the sediment 2 to realize the drying process. Under the conditions of vacuum degree ≤ 10.0Pa (the vacuum degree can be maintained at ≤ 10.0Pa under the technical conditions of this experiment, the vacuum degree is constantly changing in the actual experim...

Embodiment 2

[0042] Place the reactor in an environment of 4°C, under the stirring condition of a magnetic stirrer, add 0.1mol / L, 100mL of CoCl 2 The solution was added to the reactor. Then, at a rate of 5 mL / min, add excess NaBH with NaOH to adjust the pH value to 12 dropwise. 4 solution (0.1mol / L, 100mL), continue to stir for 0.5h after the dropwise addition to ensure the completion of the reaction, drive away the hydrogen bubbles, and obtain precipitate 1. The obtained precipitate 1 was washed three times with deionized water and then suction-filtered to obtain precipitate 2. Put the precipitate 2 into a cold trap, drop to -90°C together with the cold trap, and freeze at -90°C for 3h. After freezing, vacuumize to sublimate the liquid in the sediment 2 to realize the drying process. Under the conditions of vacuum degree ≤ 10.0Pa (the vacuum degree can be kept at ≤ 10.0Pa under the technical conditions of this experiment, the vacuum degree is constantly changing in the actual experimen...

Embodiment 3

[0045] Place the reactor in an environment of -8°C, under the stirring condition of a magnetic stirrer, add 0.1mol / L, 100mL of CoCl 2 The solution was added to the reactor. Then, at a rate of 5 mL / min, add excess NaBH with ammonia water to adjust the pH value to 12 dropwise. 4 solution (0.5mol / L, 100mL), continue to stir for 0.5h after the dropwise addition to ensure the completion of the reaction, drive away the hydrogen bubbles, and obtain precipitate 1. The obtained precipitate 1 was washed three times with absolute ethanol and once with deionized water, and then suction-filtered to obtain precipitate 2, which was placed in a refrigerator at -4°C for 1 hour. The temperature of the cold trap was lowered to -90°C, and the precipitate 2 placed in the -4°C refrigerator for 1 hour was put into the cold trap, and frozen at -90°C for 6 hours. After freezing, vacuumize to sublimate the liquid in the sediment 2 to realize the drying process. Under the conditions of vacuum degree ...

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Abstract

The invention discloses an alkaline cell, belonging to the field of alkaline cells. Evenly dispersed borides are selected as negative electrode materials of the alkaline cell; and the borides are obtained by thermally treating precursors obtained through solution chemical reaction and cooling-vacuum treatment at low temperature. The alkaline cell with the negative electrode materials has the advantages of high discharge capacity and good cycle performance. In the method for preparing the borides in the negative electrode materials of the alkaline cell, a reactor is placed in an environment with the temperature being minus 20 DEG C to 4 DEG C, thus the temperature of a reaction system can be reduced, and the reaction can be carried out the mildly. The cooling-vacuum treatment at the low temperature is used to restrain the generation of grain agglomeration effectively, thus the borides with high specific area and even grain size distribution are obtained.

Description

technical field [0001] The invention relates to an alkaline battery and belongs to the field of alkaline batteries. Background technique [0002] With the continuous improvement of energy and power requirements of power supplies for electrical equipment, the existing alkaline secondary batteries are facing great challenges. Among them, the research on hydrogen storage alloys for Ni / MH battery anode materials mainly focuses on AB 5 Type rare earth alloy, AB 2 Type Laves phase alloy, A 2 B-type magnesium-based alloys, AB-type metal compounds, and vanadium-based solid solution alloys with a body-centered cubic structure (Tang Yougen, Ni-MH battery, Chemical Industry Press, 2007). The electrochemical capacity of these alloys is low, and there are problems such as high cost, difficult activation, and serious environmental pollution. In view of resource distribution and technology mastery, Chinese and Japanese manufacturers mostly use AB 5 The electrochemical capacity of Ni-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/24H01M10/28
CPCY02E60/124Y02E60/10Y02P70/50
Inventor 吴锋吴川庞春会白莹陈实李肖肖吴伯荣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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