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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 performance.
Except for Ulus et al., other previous electrodeposition processes only used the "mixed-conductormatrix" mechanism or the concept of nanometers, and failed to solve the problem by combining dispersion medium isolation and coating.

Method used

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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

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1. Get 1 gram of polyacrylonitrile resin and be dissolved in 20 milliliters of dimethylformamide, stir solution until transparent, obtain 5% casting solution. Use a scraper to scrape the casting solution on a 20 micron thick copper plate into a thin layer of casting solution 20-30 microns thick, cover the thin layer of casting solution with a sealing cover, and add 20 grams of it within 5 minutes with a humidifier water. After soaking the obtained phase transfer microporous membrane in deionized water for 2 hours, after washing and drying several times, a microporous membrane electrode sheet with a pore size of about 1 micron is obtained, and the porous membrane electrode sheet is used as the cathode, and the tin block is used as the anode , respectively electroplating in tin, copper-tin alloy, tin-antimony alloy, tin-nickel alloy electroplating solution, and then rinse the electro-deposited pole piece repeatedly with deionized water and dry it in a drying ov...

Embodiment 2

[0028] Embodiment 2. Dissolve 0.9 gram of polyacrylonitrile and 0.1 gram of polyvinylidene fluoride in 20 milliliters of dimethylformamide, stir the solution until it is transparent, and obtain a 5% casting solution. Use a scraper to scrape the casting solution on a 20 micron thick copper plate into a thin layer of 20-30 micron thick casting solution, cover the thin layer of casting solution with a sealing cover, and add 10 grams of it within 5 minutes with a humidifier water. After soaking the obtained phase transfer microporous membrane in deionized water for 2 hours, after repeated washing and drying, a microporous membrane electrode sheet with a pore size of about 5 microns was obtained, as shown in Figure 2, the porous membrane electrode sheet was used as the The cathode and the tin block are used as the anode, and are electroplated in tin, copper-tin alloy, tin-antimony alloy, and tin-nickel alloy electroplating solutions, and then the electrodes after electrodeposition ...

Embodiment 3

[0029] Embodiment 3. Get 0.6 gram of polyacrylonitrile and dissolve in 10 milliliters of dimethylformamide and 10 milliliters of dimethyl sulfoxide, stir the solution until it is transparent, and obtain a 3% casting solution. With a scraper, the casting solution is scraped into a 20-micron thick thin layer casting solution on a 10 micron thick copper plate, and the thin layer casting solution is covered with a sealing cover, and 5 grams of water are added in 3 minutes with a humidifier. The obtained phase-transfer microporous membrane is soaked in 0.2% saline by weight for 2 hours, washed and dried several times, to obtain a microporous membrane electrode sheet with a pore diameter of about 3-10 microns, and use the porous membrane electrode sheet As the cathode and the tin block as the anode, electroplating is performed in tin, copper-tin alloy, tin-antimony alloy, and tin-nickel alloy plating solution, and then the electrodes after electrodeposition are rinsed repeatedly with...

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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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