Modified activated carbon with high hydrogen evolution potential and preparation method thereof as well as lead-acid battery negative lead paste containing modified activated carbon

A hydrogen evolution potential, lead-acid battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high hydrogen evolution rate, poor cycle life of lead-acid batteries, mismatched electrode potentials, etc.

Inactive Publication Date: 2012-01-04
HARBIN INST OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor cycle life of the lead-acid battery caused by the electrode potential mismatch between the active carbon added in the negative electrode of the existing lead-acid battery and the lead, the high hydrogen evolution rate, and the serious hydrogen evolution. Modified activated carbon with high hydrogen evolution potential, preparation method thereof, and lead-acid battery negative electrode paste containing it

Method used

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  • Modified activated carbon with high hydrogen evolution potential and preparation method thereof as well as lead-acid battery negative lead paste containing modified activated carbon
  • Modified activated carbon with high hydrogen evolution potential and preparation method thereof as well as lead-acid battery negative lead paste containing modified activated carbon
  • Modified activated carbon with high hydrogen evolution potential and preparation method thereof as well as lead-acid battery negative lead paste containing modified activated carbon

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specific Embodiment approach 1

[0018] Specific embodiment 1: This embodiment is the first modified activated carbon with high hydrogen evolution potential, which is prepared by loading hydrogen evolution inhibitor on activated carbon, wherein the mass ratio of activated carbon to hydrogen evolution inhibitor is 20:0.1~0.31 , the hydrogen evolution inhibitor is In 2 o 3 , Ga 2 o 3 and Bi 2 o 3 A mixture of one or more of them in any ratio.

[0019] The modified activated carbon particles with high hydrogen evolution potential in this embodiment are uniform, and the particle size is less than 300 mesh.

[0020] The hydrogen evolution potential of the modification activity with high hydrogen evolution potential in this embodiment is increased by 20-150 mV, the hydrogen evolution rate is significantly reduced by 10% to 60%, and the charging efficiency is increased by more than 10%. Using In 2 o 3 The hydrogen evolution rate of the modified activated carbon material is reduced by more than 50%, and the h...

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratio of activated carbon to hydrogen evolution inhibitor is 20:0.15-0.25. Other parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: This embodiment differs from Embodiment 1 in that the mass ratio of activated carbon to hydrogen evolution inhibitor is 20:0.2. Other parameters are the same as in the first embodiment.

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Abstract

The invention relates to a modified activated carbon with high hydrogen evolution potential and a preparation method thereof as well as a lead-acid battery negative lead paste containing the modified activated carbon and relates to a modified activated carbon and a preparation method thereof as well as a lead-acid battery negative lead paste containing the modified activated carbon. According to the invention, the problem of the poor cycle life of the lead-acid battery caused by the unmatching between the added activated carbon and the lead electrode potential, the large hydrogen-evolution speed and the serious hydrogen evolution in the existing lead-acid battery negative electrode is solved. In the modified activated carbon provided by the invention, a hydrogen evolution inhibitor is loaded on the activated carbon, wherein the hydrogen evolution inhibitor is one or a mixture of more than one selected from In2O3, Ga2O3 and Bi2O3, or the hydrogen evolution inhibitor is In(OH)3, Ga(OH)3 or Bi(OH)3. The modified activated carbon is prepared by a ball-milling method or a solvent precipitation method. The hydrogen evolution overpotential of the modified activated carbon is improved obviously, the hydrogen evolution speed of the modified activated carbon is reduced and the hydrogen evolution potential of the modified activated carbon is matched with a Pb electrode potential; and meanwhile, the discharge specific capacity in a cyclic process can be obviously improved, the cycle performance can be obviously improved, and the specific capacity can still reach 90mAh.g<-1> after being cycled for 500 times.

Description

technical field [0001] The invention relates to a modified activated carbon, a preparation method thereof and a lead-acid battery negative electrode paste containing the modified activated carbon. Background technique [0002] Due to the dual pressure of environmental pollution and the oil crisis, this has led to an increasing demand for hybrid electric vehicles and electric vehicles. Batteries are the power source of electric vehicles and one of the important factors that determine the performance of electric vehicles. As a battery for electric vehicles, it needs to have good high-rate charge-discharge performance and cycle performance, and it should also have the characteristics of low cost and good stability. Lithium-ion batteries have good charge and discharge performance, but their cost is relatively high, and their safety has not been fundamentally resolved. Although the cost of Ni-MH batteries is lower than that of lithium-ion batteries, their performance needs to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/56
CPCY02E60/10
Inventor 赵力王殿龙陈佰爽胡新春
Owner HARBIN INST OF TECH
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