Preparation method of modified short fiber for lead-acid battery and negative plate containing modified short fiber

A lead-acid battery and negative plate technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of poor cycle stability and low specific energy of lead-acid batteries, and achieve good charging and discharging performance, low investment, The effect of improving conductivity

Inactive Publication Date: 2015-11-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of low specific energy and poor cycle stability of the existing lead-acid batteries, the present invention provides a preparation method of modified short fibers for lead-acid batteries and a negative electrode plate containing the modified short fibers, which can greatly improve the short fiber conductivity, thereby improving the utilization rate of the active material in the plate and the cycle life under the high-rate partial charge state

Method used

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  • Preparation method of modified short fiber for lead-acid battery and negative plate containing modified short fiber
  • Preparation method of modified short fiber for lead-acid battery and negative plate containing modified short fiber
  • Preparation method of modified short fiber for lead-acid battery and negative plate containing modified short fiber

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[0030] The preparation method of modified short fiber for lead-acid battery of the present invention comprises the steps:

[0031] 1) Disperse the short fibers for industrial use in a protonic acid solution with a concentration of 1 to 5 mol / L, and stir them ultrasonically to make the short fibers evenly dispersed;

[0032] 2) Add a certain amount of polymer monomer to the above mixture, stir in an ice-water bath for 1-10 hours, the mass ratio of polymer monomer to short fiber is 10:1-10; Dissolve ammonium persulfate (APS) in a protonic acid solution with a concentration of 1 to 5 mol / L, and add it dropwise by dropwise addition. After the dropwise addition, continue to stir, and stir at 0°C for 12 to 36 hours during the polymerization process. ;

[0033] 3) After the reaction is finished, carry out vacuum filtration, rinse repeatedly with distilled water, and dry at 60° C. to obtain modified short fibers.

[0034] Wherein the protonic acid in steps 1) and 2) is one of sulfur...

Embodiment 1

[0042] The preparation method of the modified short fiber of this embodiment is: disperse the short fiber for industrial use in the sulfuric acid solution of 1mol / L, stir ultrasonically to make the short fiber disperse evenly; mix a certain amount of aniline monomer Add it to the above mixture, stir in an ice-water bath for 2 hours, the mass ratio of aniline monomer to short fiber is 10:2; dissolve ammonium persulfate (APS) which is equimolar to aniline monomer in 1mol / L sulfuric acid solution , in the way of dropwise addition, after the dropwise addition, continue to stir, and stir at 0°C for 24h during the polymerization process; After the reaction, perform vacuum filtration, rinse repeatedly with distilled water, and dry at 60°C to obtain Modified staple fiber.

Embodiment 2

[0044] The preparation method of the modified short fiber of this embodiment is: disperse the short fiber for industrial use in the sulfuric acid solution of 2mol / L, stir ultrasonically to make the short fiber disperse evenly; mix a certain amount of aniline monomer Add it to the above mixture, stir in an ice-water bath for 5 hours, the mass ratio of aniline monomer to short fiber is 10:4; dissolve ammonium persulfate (APS) which is equimolar to aniline monomer in 2mol / L sulfuric acid solution , in the way of dropwise addition, after the dropwise addition, continue to stir, and the polymerization process is stirred at 0°C for 36h; After the reaction is completed, perform vacuum filtration, rinse repeatedly with distilled water, and dry at 60°C to obtain Modified staple fiber.

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Abstract

The invention provides a preparation method of a modified short fiber for a lead-acid battery and a negative plate containing the modified short fiber. A conductive polymer coats the surface of the short fiber so as to improve the conductivity of the short fiber. By the modified short fiber, the problems of low utilization rate of an active substance of the lead-acid battery and short cycle life in a high-rate partial state of charge are hopefully solved, and meanwhile, the addition proportion of the short fiber in lead paste is increased so as to further enhance the cyclic performance of the lead-acid battery. The short fiber is an important additive in industrial production of the lead-acid battery, and a few additive amount of the short fiber is required in the lead paste due to non-conductivity of the short fiber. An in situ polymerization method is used for coating the surface of the short fiber with the conductive polymer, so that the conductivity of the short fiber is substantially improved. When the modified short fiber is added into the negative electrode lead paste of the lead-acid battery, the capacity of a battery plate and the utilization rate of the active substance can be improved, and moreover, the cyclic service life of the battery in the high-rate partial state of charge (HRPSoC) can be substantially prolonged.

Description

Technical field: [0001] The invention relates to a preparation method of modified short fibers for lead-acid batteries and a negative plate containing the modified short fibers, belonging to the field of chemical power sources. Background technique: [0002] Lead-acid batteries have the characteristics of easy availability of raw materials, low price, good safety, and high recovery rate of used batteries, which makes them still occupy the first place among various power supply technologies in terms of output value worldwide. However, compared with lithium batteries, nickel-metal hydride batteries, etc., the specific energy of lead-acid batteries is low, which greatly limits their application as power batteries in electric vehicles and other fields. The main reason for the low specific energy of lead-acid batteries is the low utilization rate of positive and negative active materials, that is, the active materials Pb and PbO 2 Can't be fully utilized. In the cycle process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/82
CPCH01M4/663H01M4/82Y02E60/10
Inventor 张校刚杨高梁丁兵窦辉佟浩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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