Preparation method of lithium-ion type perfluorosulfonic acid resin coated aluminum-lithium alloy material

A technology of perfluorosulfonic acid resin and aluminum coating, applied in the field of lithium-ion batteries, can solve the problems of irreversible capacity loss, electrode failure, loss of reversible lithium storage effect, etc., achieve good chemical stability and thermal stability, and smooth charging The effect of discharge voltage platform and good electrode reaction reversibility

Inactive Publication Date: 2016-07-06
ZHEJIANG UNIV
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Problems solved by technology

At present, the main problem faced by metal aluminum anode materials is: during the charge-discharge cycle, the reversible formation and decomposition of Li-Al alloy is accompanied by a larger volume change compared with Li-Sn alloy, which makes the alloy more prone to cracks And pulverization, the contact resistance increases, the irreversible capacity loss is formed, and even the reversible lithium storage effect is lost, which finally leads to electrode failure. Therefore, the cycle performance of lithium-ion batteries purely using aluminum as the negative electrode material is very poor.
However, Al-Li alloys are quite active, and it is difficult to coat Al-Li alloy particles with conventional techniques.

Method used

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  • Preparation method of lithium-ion type perfluorosulfonic acid resin coated aluminum-lithium alloy material
  • Preparation method of lithium-ion type perfluorosulfonic acid resin coated aluminum-lithium alloy material

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preparation example Construction

[0044] A method for preparing an aluminum-lithium alloy material coated with a Li-ion type perfluorosulfonic acid resin. The Li-ion type perfluorosulfonic acid resin-coated aluminum-lithium alloy material is used as a negative electrode material for a lithium battery. The preparation method specifically includes the following steps :

[0045] (1) In an argon atmosphere glove box with water content and oxygen content less than 1ppm, take aluminum powder and lithium sheet and put them in 316 stainless steel reactor 1-2, seal the reactor 1-2 and remove from the glove box , connected to the hydrogenation unit; wherein, the mass ratio of aluminum powder and lithium flakes is 27:7;

[0046] (2) Vacuum the reactor 1-2, and the vacuum degree reaches 10 2 After Pascal, raise the temperature of reactor 1-2 to 550°C, and react for 2 hours to generate block lithium aluminum alloy; after the reaction, cool reactor 1-2 to 200°C, and pass Enter high-purity hydrogen (purity: 99.999%) at 40 ...

Embodiment 1 4

[0058] Example 1 Preparation of Lithium Aluminum Hydride

[0059] In a glove box protected by an argon atmosphere (both water content and oxygen content are less than 1ppm), take 27g of aluminum powder and 7g of lithium sheet and place them in a reactor made of 316 stainless steel. After sealing the reactor, remove it from the glove box and pass it through the pipe joint 1 -5 connected to hydrogenation unit, such as figure 1 As shown in , all valves of the hydrogenation unit are initially closed. Open the shut-off valves 1-7, 1-8, 1-9, and vacuum until the vacuum gauge 1-12 shows 10 2 Close the stop valves 1-9 after Pascal. The electric heating furnace 1-13 is heated up to 550°C, and after the reactor temperature rises to 550°C for 2 hours, it is cooled to 200°C; the pressure reducing valve 1-6 is opened to make the high-purity hydrogen in the high-purity high-pressure hydrogen bottle 1-1 ( Purity: 99.999%) is charged into hydrogen storehouse 1-3, makes the pressure of hydr...

Embodiment 2

[0060] Example 2 Preparation of Lithium Aluminum Hydride Tetrahydrofuran Solution

[0061] In a glove box protected by an argon atmosphere (water content and oxygen content are both less than 1ppm), take 2.7g of aluminum powder and 0.7g of lithium sheet into a 316 stainless steel reactor, seal the reactor, remove it from the glove box, and connect it through a pipe Devices 1-5 are connected to the hydrogenation unit, such as figure 1 As shown, all valves of the hydrogenation unit are initially closed. Open the stop valves 1-7, 1-8, 1-9, and vacuum until the vacuum gauge 1-12 shows 10 2 Close the stop valves 1-9 after Pascal. The electric heating furnace 1-13 is heated up to 550°C, and after the reactor temperature rises to 550°C for 2 hours, it is cooled to 200°C; the pressure reducing valve 1-6 is opened to make the high-purity hydrogen in the high-purity high-pressure hydrogen bottle 1-1 ( Purity: 99.999%) is charged into hydrogen storehouse 1-3, makes the pressure of hyd...

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Abstract

The invention relates to the technical field of a lithium ion battery, and aims at providing a preparation method of a lithium-ion perfluorinated sulfonic acid resin cladding aluminum-lithium alloy material. The preparation method comprises the following steps: preparing a tetrahydrofuran solution of lithium aluminum hydride, preparing a macroporous carbon material, adding the macroporous carbon material to the tetrahydrofuran solution of the lithium aluminum hydride to prepare a macroporous carbon supported lithium aluminum hydride composite material and further to obtain a macroporous carbon supported aluminum-lithium composite material; preparing a Li<+> perfluorinated sulfonic acid resin solution, and preparing the macroporous carbon supported Li<+> perfluorinated sulfonic acid resin cladding aluminum-lithium alloy composite material by virtue of the Li<+> perfluorinated sulfonic acid resin solution and the macroporous carbon supported aluminum-lithium composite material. The prepared lithium-ion perfluorinated sulfonic acid resin cladding aluminum-lithium alloy material has the advantages that organic electrolyte is safer when being applied to the battery; the electrode reaction reversibility is good; the chemical stability and thermal stability are good; the price is low, and easiness in preparation can be realized; no pollution is caused; safety of the lithium ion battery can be improved by virtue of oxidation resistance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method for a Li-ion type perfluorosulfonic acid resin-coated aluminum-lithium alloy material. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. In 1990, Nagoura and others in Japan developed a negative electrode using petroleum coke and LiCoO 2 Lithium-ion battery as the positive electrode: LiC 6 |LiClO 4 -PC+EC|LiCoO 2 . same year. Two major battery companies, Moli and Sony, have announced that they will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/46H01M4/62H01M4/1395
CPCH01M4/364H01M4/463H01M4/663H01M10/0525Y02E60/10
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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