Lithium metal negative plate, preparation method thereof and secondary battery

A lithium metal negative electrode and metal lithium technology, applied in secondary batteries, negative electrodes, battery electrodes, etc., can solve problems such as easy formation of lithium dendrites

Pending Publication Date: 2021-12-31
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium metal negative electrode and its preparation method, as well as a secondary battery, aiming to solve the problem that lithium dendrites are easily formed during the cycle process of the existing lithium metal negative electrode to a certain extent

Method used

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  • Lithium metal negative plate, preparation method thereof and secondary battery
  • Lithium metal negative plate, preparation method thereof and secondary battery
  • Lithium metal negative plate, preparation method thereof and secondary battery

Examples

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preparation example Construction

[0054] as attached figure 1 As shown, the second aspect of the embodiment of the present invention provides a method for preparing a lithium metal negative electrode sheet, comprising the following steps:

[0055] S10. In a protective atmosphere, mix carbon materials, lithium-friendly materials, metal lithium, and a binder with a solvent to make a mixed slurry; the particle size D50 of the lithium-friendly material is not higher than 120nm; the particle size D50 of the lithium metal is not higher than Higher than 120nm; the carbon material skeleton has a three-dimensional pore structure, the porosity is 30-70%, and the pore diameter is 10-100μm;

[0056] S20. Forming the mixed slurry on the surface of the negative current collector to form a film, and drying to obtain a lithium metal negative electrode sheet.

[0057] The preparation method of the lithium metal negative electrode sheet provided by the second aspect of the embodiment of the present invention, in order to avoid...

Embodiment 1

[0074] A kind of lithium metal negative plate , its preparation includes the steps of:

[0075] ①In a glove box with a water content of less than 1ppm and an oxygen content of less than 2ppm, Si particles with a particle size D50 of 50nm are used as the lithium-friendly material. The weight ratio of carbon black:lithophilic material:metal lithium is 60:30:10, which is called Take each raw material component;

[0076] ②Dissolve polyvinylidene fluoride PVDF in tetrahydrofuran THF to make a glue with a solid content of 7%; add carbon black, lithium-friendly materials and metallic lithium to the glue until the solid content is 50%; After mixing evenly, the slurry was coated on a copper foil with a coating thickness of 50 μm, and dried in a glove box at a temperature of 85° C. to obtain a lithium metal negative electrode sheet.

[0077] A lithium ion battery , the lithium metal negative electrode sheet prepared in Example 1, the lithium positive electrode sheet, the 12+4 ceram...

Embodiment 2

[0079] A kind of lithium metal negative plate , which differs from Example 1 in that: Si particles with a particle diameter D50 of 80 nm are used as the lithium-philic material.

[0080] A lithium ion battery , which differs from Example 1 in that: the lithium metal negative electrode sheet prepared in Example 2 is used to assemble a Li-Li symmetric battery.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a lithium metal negative plate, a preparation method thereof and a secondary battery. The lithium metal negative electrode plate comprises a negative electrode active layer, the negative electrode active layer comprises a carbon material framework, the carbon material framework has a three-dimensional pore structure, and pores of the three-dimensional pore structure contain a lithium-loving material and metal lithium; the particle size D50 of the lithium-loving material is not higher than 120nm; the particle size D50 of the metal lithium is not higher than 120nm; the porosity of the three-dimensional pore structure is 30%-70%, and the pore diameter is 10-100 m. The lithium metal negative electrode plate provided by the invention comprises the carbon material skeleton with the three-dimensional pore structure, and the pores of the three-dimensional pore structure contain the lithium-loving material and the metal lithium, so that the risk that lithium dendrites are easy to grow on the surface of the lithium metal negative electrode plate is relieved, and meanwhile, the cycling stability and the safety performance of the lithium metal negative electrode plate are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium metal negative electrode sheet, a preparation method thereof, and a secondary battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras, and laptop computers, but also widely used in electric vehicles, electric bicycles, and electric vehicles. In terms of large and medium-sized electric equipment such as tools, the performance requirements of lithium-ion batteries are getting higher and higher. [0003] At present, lithium-ion batteries constitute the main energy storage device of current electric vehicles, and the improvement of the energy density of lithium-ion batteries is a necessary condition for the widespread application of electric vehicles. Compared with the cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/62H01M4/1395H01M10/0525
CPCH01M4/134H01M4/382H01M4/628H01M4/1395H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杨成林
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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