Current collector, preparation method thereof, electrode plate, preparation method of electrode plate, and lead-acid battery

A current collector and electrode sheet technology, applied in the field of lead-acid batteries, can solve the problems of short cycle life, incomplete reaction of positive and negative active materials, and low specific energy of lead-acid batteries, so as to improve cycle life, high rate performance and Utilization efficiency, effect of density reduction

Active Publication Date: 2019-09-24
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing lead-acid battery technology, high-density lead alloys are often used as the grid, and in the process of electrochemical charging and discharging, the active materials of the positive and negative electrodes cannot completely react, so that the specific energy of the lead-acid battery is low and the cycle time is low. short life

Method used

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preparation example Construction

[0042] The present invention also provides a method for preparing a fluid collector, comprising the steps of:

[0043] In the first step, a precursor solution is configured, and the precursor solution is a polymerizable water-based polymer precursor solution.

[0044] In the second step, fibers are added into the precursor solution and the fibers are uniformly dispersed in the precursor solution.

[0045] In the third step, the precursor solution is heated to cause in-situ polymerization to obtain a hydrogel. The fibers are packed within the hydrogel.

[0046] The fourth step is to dry the hydrogel to obtain an organogel with ideal network structure.

[0047] The fifth step is to heat and carbonize the organogel in an oxygen-free environment to obtain a fiber-reinforced carbon-airgel composite material.

[0048] Wherein, the fiber is used to increase the flexibility and processability of the fiber-reinforced carbon airgel composite material.

[0049] Wherein, before the step...

Embodiment 1

[0085] Embodiment 1 Preparation of fiber-reinforced carbon aerogel

[0086] In a 3-liter cuboid container, mix resorcinol and formaldehyde dissolved in water at a molar ratio of 1:2, the ratio of phenolic formaldehyde to water is 1:8, and add sodium carbonate accounting for 1 / 1000 of resorcinol solution. Stir for 30 minutes to combine well. Add 30 grams of carbon fibers with a length of 5 mm, and disperse them by stirring and ultrasonic to make the carbon fibers uniformly dispersed. Seal the container, place it in an environment of 85° C., and keep it for 4 days to obtain a hydrogel. Dry at 60° C. for 24 hours under normal pressure to obtain an organogel. Machined and cut into grid shapes. Carbonize at 800°C for 2 hours in an oxygen-free environment. Fiber-reinforced carbon airgel can be obtained.

Embodiment 2

[0087] Example 2 Preparation of Fiber Reinforced Carbon Aerogel

[0088] In a 3-liter cuboid container, mix resorcinol and formaldehyde dissolved in water at a molar ratio of 1:2, the ratio of phenolic formaldehyde to water is 1:9, and add sodium carbonate accounting for 1 / 800 of resorcinol solution. Stir for 30 minutes to combine well. Add 40 grams of polyacrylonitrile fibers with a length of 4 mm and 1 gram of sodium benzenesulfonate, and disperse by stirring and ultrasonic to make the polyacrylonitrile fibers evenly dispersed. Seal the container, place it in an environment of 85° C., and keep it for 3 days to obtain a hydrogel. Dry at 60° C. for 24 hours under normal pressure to obtain an organogel. Machined and cut into grid shapes. Carbonize at 800°C for 2 hours in an oxygen-free environment. Carbon fiber-reinforced carbon airgel can be obtained.

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Abstract

The invention discloses a current collector. The current collector is made of a fiber reinforced carbon aerogel composite material; the fiber-reinforced carbon aerogel composite material is a high-conductivity porous carbon material and comprises carbon aerogel and fibers, and the fibers are filled in the carbon aerogel. The invention also relates to a preparation method of the current collector, an electrode plate, a preparation method of the electrode plate and a lead-acid battery.

Description

technical field [0001] The invention relates to the field of current collectors and lead storage batteries, in particular to a current collector, a method for preparing the current collector, an electrode sheet, a method for preparing the electrode sheet, and a lead-acid battery. Background technique [0002] Lead-acid batteries occupy a huge market share in the secondary battery market and are one of the main power sources for electric vehicles. They have the advantages of wide operating temperature range, high safety, and high cost performance. Because lead has a high atomic number and high density, it has obvious disadvantages compared with emerging lithium-ion batteries in terms of specific energy. Therefore, the market share of lead-acid batteries in mobile applications is gradually being eroded by lithium-ion batteries. However, in the existing lead-acid battery technology, high-density lead alloys are often used as the grid, and in the process of electrochemical char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/68H01M4/14H01M4/16H01M10/12
CPCH01M4/14H01M4/16H01M4/663H01M4/668H01M4/68H01M10/12H01M2220/20Y02E60/10Y02P70/50
Inventor 杜鸿达丁亚红
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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