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A positive electrode of a lead-acid battery using lead sulfate as an active material and a method for preparing a lead-acid battery using the positive electrode

A lead-acid battery and active material technology, applied in the direction of lead-acid battery electrodes, battery electrodes, circuits, etc., can solve the problems of unreported electrode cycle performance, low discharge specific capacity, poor plate performance, etc., to improve electrochemical performance , Pollution risk reduction, and the effect of reducing production costs

Active Publication Date: 2018-08-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of the plate prepared in the electrolyte solution with pH ≤ 3 is poor, and the discharge capacity is lower than 65mAh / g
In addition, they did not report the cycle performance of the electrode (Journal of Power Sources207(2012), 51–55)
[0007] Our research found that even if nano-micron-sized lead sulfate prepared according to ZL 2013 1 0665446.1 is used, it is very unlikely to directly apply ordinary lead-acid battery positive grids to prepare positive plates because of its extremely low discharge specific capacity

Method used

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  • A positive electrode of a lead-acid battery using lead sulfate as an active material and a method for preparing a lead-acid battery using the positive electrode
  • A positive electrode of a lead-acid battery using lead sulfate as an active material and a method for preparing a lead-acid battery using the positive electrode

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preparation example Construction

[0022] (1) Preparation of lead sulfate: the lead sulfate used can be prepared from the positive electrode material of the waste lead-acid battery, or prepared from lead salt and sulfuric acid or sulfate. The present invention only considers the former. The method is: for the positive electrode material of waste lead-acid battery, because it contains PbO 2 and PbSO 4 , first need to put PbO 2 reduction followed by desulfurization to give PbCO 3 or basic lead carbonate. For example, we have reported a method for the thermal reduction of waste lead-acid battery cathode materials in a closed container at 140 °C:

[0023] 3PbO 2 +CH 3 OH=2PbO+PbCO 3 +2H 2 O (1)

[0024] Combine the prepared PbO with H 2 SO 4 Reaction to get PbSO 4 :

[0025] PbO+H 2 SO 4 =PbSO 4 +H 2 O (2)

[0026] We found that the prepared PbSO 4 It is a good negative active material, but its performance is poor when used directly as a positive active material. However, experiments have found th...

Embodiment 1

[0045] (1) Gently disassemble the lead-acid battery to obtain the positive plate, and then separate the lead alloy grid from the electrode powder. The electrode powder is the positive electrode material of the waste lead-acid battery. Analysis of which PbSO 4 and PbO 2 content.

[0046] (2) Put the waste lead-acid battery positive electrode material into a stirring reactor, and then press the PbSO 4 Add sufficient amount of alkali solution, stir to make it react, and the reaction time is within 2h. The base can be any soluble carbonate or hydroxide (including ammonia). The solid was filtered and washed to remove soluble salts.

[0047] (3) Roast the solid obtained in the second step in air at 450°C for 2 hours to obtain Pb 3 o 4 .

[0048] (4) React soluble lead salt solution, such as lead nitrate, lead acetate or lead chloride, with sodium sulfate solution in a counterflow reactor to obtain ultrafine PbSO 4 .

[0049] (5) combine the lead sulfate that makes and the ...

Embodiment 2

[0052] Step is basically the same as Example 1, difference is: in step (3), solid is roasted 3h in 350 ℃ of air; In step (5), acetylene black is 0.1% of the quality of lead sulfate, and short fiber is the quality of lead sulfate 0.4%.

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Abstract

The invention discloses a lead-acid cell positive electrode with lead sulfate as an active material and a method for preparing a lead-acid cell through the positive electrode. The cell positive electrode is prepared from PbSO4, PbO2 or Pb3O4 accounting for, by mass, 1-90% of the PbSO4, and short fibers accounting for, by mass, less than or equal to 1% of the PbSO4. A certain proportion of the PbO2 or Pb3O4 is added into the PbSO4, the electrochemical performance of the lead sulfate is remarkably improved so that the lead sulfate can replace lead-containing lead oxide used in a traditional lead-acid cell, and the manufacturing cost of the lead-acid cell is reduced. Raw materials used in the cell positive electrode come from positive electrode materials of waste lead-acid cells, the method is simple and practical, and a new concept for recycling the waste lead-acid cells is provided; the high-energy-consumption lead smelting process in the traditional waste lead-acid cell recycling process is omitted, the pollution risk is greatly reduced, the preparing process meets the requirement for clean production, the production cycle of the cell is shortened, and the production cost is reduced.

Description

technical field [0001] The invention relates to a positive electrode of a lead-acid battery using lead sulfate as an active material and a method for preparing a lead-acid battery by using the positive electrode, belonging to the technical field of lead-acid battery manufacture and recycling. Background technique [0002] Lead-acid batteries are popular due to their excellent cost performance, and are widely used as uninterruptible power supplies, energy storage power supplies, car starting and power supplies for electric vehicles, etc., accounting for more than 50% of the chemical power supply market. Its electrochemical principle is that when charging, lead sulfate (PbSO 4 ) is converted into lead dioxide (PbO 2 ), which is converted into metallic lead (Pb) at the negative electrode, thereby converting electrical energy into chemical energy and storing it; when discharging, PbO 2 and Pb revert to PbSO at the positive and negative electrodes, respectively 4 , converts ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/56H01M4/58H01M4/14H01M4/20
CPCH01M4/14H01M4/20H01M4/364H01M4/56H01M4/5825Y02E60/10
Inventor 雷立旭张科刘巍马蓓蓓
Owner SOUTHEAST UNIV
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