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Lithium metal cathode, preparation method thereof, and preparation method of all-solid-state battery

A lithium metal negative electrode and metal lithium technology, applied in secondary batteries, battery electrodes, electrode carriers/collectors, etc., to achieve the effects of increasing energy density, reducing local current density, and good processability

Active Publication Date: 2019-08-02
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art, the first object of the present invention is to provide a lithium metal negative electrode, which has the advantages of increasing the contact area between the negative electrode lithium metal and the solid electrolyte, increasing the deposition site, and not easily causing excessive local charging current. Advantages, and thus less prone to dendrite problems, increase the actual usable current density

Method used

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  • Lithium metal cathode, preparation method thereof, and preparation method of all-solid-state battery

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Example 1: Lithium metal negative electrode, prepared by the following steps:

[0074] Step 1, uniformly mix the polymer solid electrolyte polyoxyethylene, 20g of acetonitrile, 1g of polyethylene dispersant, and 2g of SBR binder to obtain the first mixture;

[0075] Step 2, select granular lithium powder (equivalent volume equivalent diameter is 30 μm), add 120g granular lithium powder (the volume ratio of lithium powder to polymer solid electrolyte polyoxyethylene is 5) to step 1, and stir in vacuum evenly to obtain the first Two mixtures;

[0076] In step 3, the second mixture is evenly coated on the copper foil, and dried in vacuum to obtain a lithium metal negative electrode.

Embodiment 2

[0077] Example 2: Lithium metal negative electrode, the difference from Example 1 is that the steps of the preparation process are as follows:

[0078] In step 1, the polymer solid electrolyte (polyvinylene carbonate), 30g of acetonitrile, 2g of polyethylene dispersant, and 10g of SBR binder are uniformly mixed to obtain the first mixture;

[0079] Step 2, select granular lithium powder (equal volume equivalent diameter 10 μm), add 160g granular lithium powder (volume ratio of lithium powder and polymer solid electrolyte (polyvinylene carbonate) to the first mixture obtained in step 1 is 7), vacuum stirring to obtain the second mixture;

[0080] Step 3, coating the second mixture obtained in Step 2 on a copper foil, and drying in a vacuum to obtain a lithium metal negative electrode.

Embodiment 3

[0081]Example 3: lithium metal negative electrode, the difference from Example 1 is that the steps of the preparation process are as follows:

[0082] Step 1, the solid electrolyte A formed by polysiloxane and LAGP powder, the solvent composed of 25g toluene and 15g n-hexane, 3g polyethylene dispersant, and 5g SBR binder are uniformly mixed to obtain the first mixture;

[0083] Step 2, select granular lithium powder (equivalent volume diameter 1 μm), add 200g granular lithium powder (solid electrolyte A formed by lithium powder and polysiloxane / LAGP powder) to the first mixture obtained in step 1 The volume ratio is 10), and the vacuum stirring is evenly obtained to obtain the second mixture;

[0084] Step 3, coating the second mixture obtained in Step 2 on a copper foil, and drying in a vacuum to obtain a lithium metal negative electrode.

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Abstract

The invention discloses a lithium metal cathode, a preparation method thereof, and a preparation method of an all-solid-state battery. The lithium metal cathode comprises a copper foil and a coating wrapping the copper foil and obtained by coating a metal lithium mixture, the metal lithium mixture comprises 50-70 parts of a solid electrolyte A, 20-40 parts of a solvent, 1-3 parts of a dispersant agent, 2-10 parts of a binder by weight and lithium powder; the volume ratio of the lithium powder to the solid electrolyte A is (5-10):1, the solid electrode A in the form of powder comprises at leastone selected from a polymer solid electrolyte and an inorganic solid electrolyte, and the solvent comprises at least one selected from toluene, chlorobenzene, tetrahydrofuran, hexane, acetonitrile and alkenyl carbonate; and the isopyknic equivalent diameter of lithium powder is 1-50 micron. The lithium metal cathode increases the contact area, improves the deposition site, and tends not to causetoo heavy local charging current, and further a dentrite problem tends not to occur, and the practical current density that can be applied to the all-solid-state battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium solid-state batteries, more specifically, it relates to a lithium metal negative electrode, a preparation method thereof, and a method for preparing an all-solid-state battery. Background technique [0002] Lithium-ion batteries have developed rapidly since SONY developed commercial lithium-ion batteries using graphite negative electrodes based on intercalation reactions. And with the proposal of the national new energy strategy, new energy electric vehicles have developed rapidly, and the application of lithium ions to new energy electric vehicles is also the main direction of current research. [0003] Commercial lithium-ion batteries using graphite as the negative electrode are difficult to meet the requirements for long battery life and fast charging. However, the theoretical capacity of the metal lithium anode is ten times that of the traditional graphite anode (3860mA h g -1 , the graphite...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/485H01M4/36H01M10/0562H01M10/0565H01M10/0525H01M10/058H01M4/62
CPCH01M4/667H01M4/485H01M4/362H01M10/0562H01M10/0565H01M10/0525H01M10/058H01M4/62Y02E60/10Y02P70/50
Inventor 崔言明刘张波许晓雄黄园桥
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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