Method for making negative pole of lithium ion battery with compound structure via electric sediment technology

A lithium-ion battery and composite structure technology, applied in the direction of alkaline storage battery electrodes, etc., can solve the problems such as the first charge-discharge efficiency and cycle performance, etc., and achieve the advantages of convenient electrode fabrication, long cycle life and low cost. Effect

Inactive Publication Date: 2008-08-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still great deficiencies in its preparation process. Its composite is realized by coating the mixture of graphite and resin on the coating, which fails to solve the first charge and discharge efficiency and cycle perfo

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  • Method for making negative pole of lithium ion battery with compound structure via electric sediment technology
  • Method for making negative pole of lithium ion battery with compound structure via electric sediment technology

Examples

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Example Embodiment

[0027] Example 1. Dissolve 1 gram of polyacrylonitrile resin in 20 ml of dimethylformamide, stir the solution until it is transparent, and obtain a 5% casting solution. Use a spatula to scrape the casting liquid on a 20 micron thick copper plate into a thin layer of 20-30 micron thick film casting liquid, cover the thin film casting liquid with a sealing cover, and use a humidifier to add 20 grams within 5 minutes water. The phase transfer microporous membrane obtained was immersed in deionized water for 2 hours, washed and dried many times to obtain a microporous membrane electrode sheet with a pore diameter of about 1 micron. The porous membrane electrode sheet was used as the cathode and the tin block was used as the anode. , Electroplating in tin, copper-tin alloy, tin-antimony alloy, tin-nickel alloy electroplating baths respectively, and then the electrode pieces after electrodeposition are repeatedly rinsed with deionized water and dried in a drying oven at 50 ℃, and then p...

Example Embodiment

[0028] Example 2. Dissolve 0.9 g of polyacrylonitrile and 0.1 g of polyvinylidene fluoride in 20 ml of dimethylformamide, stir the solution until it is transparent, and obtain a 5% casting solution. Use a scraper to scrape the casting liquid on a 20-micron thick copper plate into a thin layer of 20-30 micron thick film casting liquid, cover the thin film casting liquid with a sealing cover, and use a humidifier to add 10 grams within 5 minutes water. The phase transfer microporous membrane obtained was immersed in deionized water for 2 hours, washed and dried many times, and a microporous membrane electrode sheet with a pore diameter of about 5 microns was obtained. As shown in Figure 2, the porous membrane electrode sheet was used as Cathode, tin block as anode, electroplating separately in tin, copper-tin alloy, tin-antimony alloy, tin-nickel alloy electroplating bath, and then the electrodeposition after electrodeposition is repeatedly rinsed with deionized water and dried in a...

Example Embodiment

[0029] Example 3. Dissolve 0.6 g of polyacrylonitrile in 10 ml of dimethylformamide and 10 ml of dimethyl sulfoxide, stir the solution until it is transparent, and obtain a 3% casting solution. Use a spatula to scrape the casting liquid on a 10 micron thick copper plate into a 20 micron thick thin film casting liquid, cover the thin film casting liquid with a sealing cover, and use a humidifier to add 5 grams of water within 3 minutes. The phase transfer microporous membrane obtained was immersed in 0.2% saline water for 2 hours, washed and dried many times to obtain a microporous membrane electrode sheet with a pore size of about 3-10 microns. The porous membrane electrode sheet As the cathode, the tin block as the anode, electroplating in tin, copper-tin alloy, tin-antimony alloy, tin-nickel alloy electroplating baths respectively, and then the electrodeposited pole pieces are repeatedly rinsed with deionized water and placed in a dry box at 50°C After drying, the composite anod...

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Abstract

The invention belongs to material preparation technical field, in particular to a method for preparing composite Li-ion battery cathode by an electrodeposition technology. The method comprises the following steps of: preparing and scraping polymer casting solution on the surface of clutch gold; conducting humidification treatment on the polymer casting solution by a humidifier or conducting phase inversion in non-solvent until phase inversion occurs in the polymer casting solution and micro porous membrane is formed; making use of the electrodeposition technology to allow tin or tutania to deposit on the surface of the clutch gold; conducting thermal treatment on the clutch gold with the protection of idle gas to obtain a Li-ion battery composite cathode electrode tab. The composite materials prepared with the method can satisfy the application of Li-ion battery cathode, is strong in operability, low in cost, convenient for electrode preparation, high in specific capacity and long in cycling life.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a negative electrode of a lithium-ion battery with a composite structure by an electrodeposition process. Background technique [0002] Since the advent of lithium-ion batteries in the early 1990s, lithium-ion battery technology using graphitized carbon materials as negative electrodes, lithium cobaltate materials as positive electrodes, and polypropylene microporous membranes as battery separators has achieved tremendous development. At present, the commercial lithium-ion battery negative electrode is still dominated by graphitized carbon materials. For lithium-ion secondary batteries, compared with graphitized carbon materials, using alloys and their composite materials as negative electrodes can not only improve the compatibility of the negative electrode material with the electrolyte, but also greatly increase the specific capac...

Claims

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Application Information

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IPC IPC(8): H01M4/26
CPCY02E60/10
Inventor 赵海鹏姜长印何向明蒲薇华任建国万春荣李建军王莉
Owner TSINGHUA UNIV
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