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Preparation method of powder lithium electrode

A lithium electrode and powder technology, which is applied in the field of powder lithium electrode preparation, can solve the problems of restricting the rate discharge performance of lithium batteries, poor rate characteristics of metal lithium batteries, and inability to perform high-current discharge, etc., to improve discharge rate characteristics and interface Compatibility, the effect of improving the interface reactivity

Inactive Publication Date: 2012-05-02
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the exchange current density of metal lithium in non-aqueous electrolyte solution is very small (2 ), which makes it impossible to perform high-current discharge in this type of electrolyte solution, which seriously restricts the rate discharge performance of lithium batteries, resulting in poor rate characteristics of metal lithium batteries, and lithium electrodes are the key to determining battery discharge performance. Therefore, in occasions that require high-power electric energy output, such as electric tools or electric vehicles, metal lithium batteries with lithium foil negative electrodes are difficult to be applied.

Method used

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  • Preparation method of powder lithium electrode
  • Preparation method of powder lithium electrode

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preparation example Construction

[0024] The preparation process of powder lithium electrode is as follows:

[0025] ⑴ Preparation of powdered lithium

[0026] Under the protection of an inert atmosphere, mix molten metal lithium and hot silicone oil at a volume ratio of 1:40-1:120, pour into a high-speed dispersion mixer, disperse and stir at 600-6000rp / min for 60-180 minutes, and form lithium milk turbid liquid, and then rapidly cool the lithium emulsion to room temperature of 25°C in a rapid cooling machine to form a lithium mixed solution, and then pour the mixed solution into a 40-800 mesh sieve to obtain wet powder lithium; The wet lithium powder is fully cleaned with anhydrous cyclohexane to remove the silicone oil attached to the surface, and then dried in a vacuum oven at 90°C-120°C for 12-24h, and passed through a 40-800 mesh screen to obtain a particle size of 10um - 150um powder lithium 2;

[0027] ⑵ Selection and welding of metal current collector

[0028] Copper foam or nickel foam with a poro...

Embodiment 1

[0034] ⑴ Preparation of powdered lithium

[0035] Under the protection of inert Ar gas, mix molten metal lithium at 185°C-250°C with hot silicone oil at a volume ratio of 1:40-1:120, pour it into a high-speed dispersion mixer, and disperse and stir at 600-6000rp / min for 60-180 Minutes to form a lithium emulsion, then rapidly cool the lithium emulsion to a room temperature of 25°C in a rapid cooler to form a lithium mixture, then pour the mixture into a 40-800 mesh sieve, Wet lithium powder is obtained; the wet lithium powder is fully cleaned with anhydrous cyclohexane to remove the silicone oil attached to the surface, and then dried in a vacuum oven at 90°C-120°C for 12-24h, and passed through a 40-800 mesh screen, Prepare lithium powder with a particle size of 10um-150um;

[0036] ⑵ Selection and welding of metal current collector

[0037] Choose a porosity of 50% to 95%, an area of ​​10cm 2 -100cm 2 1. Copper foam with a thickness of 1mm-2mm is used as the metal current...

Embodiment 2

[0043] Sieve the lithium powder prepared in Example 1 until the powder lithium with a particle size of 10 um and the conductive carbon powder Super P with a particle size of 1 um to 50 um are evenly mixed at a volume ratio of 9:1, and 1 g to 200 g of the mixed powder is weighed and evenly sprinkled. Fall on the foamed copper surface, all the other steps are identical with embodiment 1, promptly make the powder lithium electrode that is filled in the foamed copper and contain conductive carbon powder Super P.

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Abstract

The invention relates to a preparation method of a powder lithium electrode, which comprises the steps that fillers containing powder lithium are filled in gaps of a foam metal current collector and are pressed to be molded, and then the powder lithium electrode is obtained. According to the preparation method, the electrode containing the powder lithium is adopted, so active substances are pulverized, the specific surface area of the electrode is effectively increased, the discharge current density of the electrode is enhanced, and the battery discharge rate capability is effectively improved, and a metal lithium battery prepared by adopting the electrode can satisfy the requirement of high-power electric energy output; foam copper or foam nickel with a three-dimensional porous structure is adopted as the current collector of the electrode, so direct contact parts of the powder lithium and the current collector of the electrode are guaranteed to be firmly bonded, the bonding force among the powder lithium is guaranteed as well, and powder is effectively prevented from shedding from the electrode when the electrode is used; and conductive powder is mixed into the powder lithium, so the discharge performance of the powder lithium electrode is further improved. The metal lithium battery prepared by adopting the electrode can be widely applied to the fields of high-power hybrid electric tools, electric vehicles, and the like.

Description

technical field [0001] The invention belongs to the technical field of metal lithium batteries, and in particular relates to a preparation method of a powder lithium electrode. Background technique [0002] Lithium metal batteries have attracted much attention for a long time due to their high working voltage and specific discharge capacity. At present, the relatively mature commercial lithium metal batteries mainly include lithium-iodine batteries, lithium-manganese dioxide batteries, lithium-thionyl chloride batteries, etc., which are widely used in daily consumer electronics and portable mobile communications. [0003] Currently known metal lithium batteries usually use lithium foil as the material for making the negative electrode. The foils are pressed together under a certain pressure to obtain metal lithium electrodes. The interfacial properties of this lithium metal electrode largely affect the discharge performance of the electrode. Studies have shown that the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 桑林丁飞张晶徐志彬刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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