A kind of preparation method of metal lithium composite negative electrode for solid-state battery

A technology of solid-state batteries and metal lithium, which is applied in battery electrodes, electrode manufacturing, lithium batteries, etc., can solve the problems of unknown lithium metal negative electrodes, achieve uniform deposition and deintercalation, slow down volume changes, and good cycle stability.

Active Publication Date: 2022-04-12
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own shortcomings. Most of the methods focus on the construction of the electronic conductor of the metal lithium negative electrode, which is mainly aimed at the problems that occur when the lithium negative electrode is used in liquid batteries.
Unlike solid-state batteries, there is an electrolyte in a liquid battery. Since the negative electrode is soaked in an electrolyte with high ionic conductivity, even when the volume of the negative electrode changes, the liquid fluidity of the electrolyte that conducts ions will fill this part of the volume change. Therefore, liquid batteries generally do not consider the influence of ionic conductors in composite negative electrodes. Technicians do not know whether the metal lithium negative electrodes used in liquid batteries can be applied to solid-state batteries to solve the above-mentioned technologies encountered by metal lithium negative electrodes for solid-state batteries. question
In addition, when the electroplating method or the introduction of lithium-friendly substances into the porous framework are used, it is inevitable to introduce impurity phases into the lithium negative electrode that may seriously affect the performance of the lithium negative electrode.

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  • A kind of preparation method of metal lithium composite negative electrode for solid-state battery
  • A kind of preparation method of metal lithium composite negative electrode for solid-state battery
  • A kind of preparation method of metal lithium composite negative electrode for solid-state battery

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preparation example Construction

[0032] The invention provides a method for preparing a metal lithium composite negative electrode, comprising the following steps:

[0033] (1) Under the protection of inert gas, at a temperature of 200-400°C, mix and stir the filler powder and molten metal lithium until the powder material is completely dispersed in the molten metal lithium;

[0034] (2) While keeping the molten lithium metal, the above slurry is coated on the preheated metal foil substrate, cooled to room temperature naturally, and then cut into pieces.

[0035] In the solution of the present invention, the filler powder is a material that does not react with lithium metal and has ionic conductivity or electronic conductivity, specifically including: copper powder, titanium powder, iron powder, nickel powder, carbon nanotubes, solid Electrolyte Li 7 La 3 Zr 2 o 12 , Li 3 One or more of N.

[0036] The mass ratio of filler powder to metal lithium is 1:5˜5:1.

[0037] In step (1), the stirring time is 0...

Embodiment 1

[0048] A preparation method of copper / lithium composite negative electrode of the present invention, comprises the following steps:

[0049] (1) In an inert gas protection, heat 0.23g metal lithium sheet to 300°C to melt, add 0.20g copper powder and mix with molten metal lithium, stir for 0.5h, so that copper powder is completely dispersed in molten metal lithium, and a mixed slurry is obtained material;

[0050] (2) Heat the stainless steel foil to 300°C and keep it warm. Preheat the scraper with a gap of 100 μm at 300°C for 15 minutes while keeping the lithium metal in a molten state, and then use the scraper to coat the copper-lithium mixed slurry on the stainless steel foil. cloth. After being naturally cooled to room temperature, it was cut into 16mm discs with a cutting machine.

Embodiment 2

[0052] A method for preparing a solid electrolyte / lithium composite negative electrode of the present invention, comprising the following steps:

[0053] (1) In an inert gas protection, heat 0.23g metal lithium sheet to 300°C to melt, add 0.20g lithium nitride powder and mix with molten metal lithium, stir for 1h, so that lithium nitride powder is completely dispersed in molten metal lithium, get mixed slurry;

[0054] (2) Heat the titanium foil to 300°C and keep it warm. Preheat the scraper with a gap of 100 μm at 300°C for 15 minutes while keeping the metal lithium molten, and then use the scraper to thermally coat the mixed slurry on the titanium foil. After being naturally cooled to room temperature, it was cut into 16mm discs with a cutting machine.

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Abstract

The invention discloses a method for preparing a lithium metal composite negative electrode for a solid-state battery, which comprises the following steps: (1) under the protection of an inert gas, at a temperature of 200-400 ° C, the filler powder is mixed with molten metal lithium Mix and stir until the powder material is completely dispersed in the molten lithium metal; (2) While keeping the molten lithium metal, apply the above slurry on the preheated metal foil substrate, cool to room temperature naturally, and then cut piece. The preparation method of the invention is simple, and the prepared metal lithium composite electrode has good structural stability, cycle stability and rate performance when used in solid-state batteries, and can be commercially produced in large quantities.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium batteries, and in particular relates to a method for preparing a metal-lithium composite negative electrode for solid-state batteries. Background technique [0002] With the further development of the information society, people's demand for efficient use of energy is becoming more and more prominent, and electric energy is the most advantageous energy among all energy sources. The storage of electrical energy is the most critical part of its use. Lithium-ion batteries have been widely used because of their relatively high energy density and safety, and have become the first choice for portable power supplies. However, with the exponential development of information technology, lithium-ion batteries using traditional graphite negative electrodes will not be able to meet the needs of equipment, and there is an urgent need to develop a next-generation battery with higher energy density. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M4/04H01M10/052
CPCH01M4/362H01M4/382H01M4/62H01M4/624H01M4/625H01M4/626H01M4/628H01M4/1395H01M4/0404H01M10/052Y02E60/10
Inventor 韩喻朱宇豪王珲郑春满洪晓斌谢凯
Owner NAT UNIV OF DEFENSE TECH
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